I also finally found the following in my system log on one server:

[10679.524491] INFO: task glusterclogro:14933 blocked for more than 120 seconds.

[10679.525826] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.

[10679.527144] glusterclogro D ffff97209832bf40 0 14933 1 0x00000080

[10679.527150] Call Trace:

[10679.527161] [<ffffffffb9913f79>] schedule+0x29/0x70

[10679.527218] [<ffffffffc060e388>] _xfs_log_force_lsn+0x2e8/0x340 [xfs]

[10679.527225] [<ffffffffb92cf1b0>] ? wake_up_state+0x20/0x20

[10679.527254] [<ffffffffc05eeb97>] xfs_file_fsync+0x107/0x1e0 [xfs]

[10679.527260] [<ffffffffb944f0e7>] do_fsync+0x67/0xb0

[10679.527268] [<ffffffffb992076f>] ? system_call_after_swapgs+0xbc/0x160

[10679.527271] [<ffffffffb944f3d0>] SyS_fsync+0x10/0x20

[10679.527275] [<ffffffffb992082f>] system_call_fastpath+0x1c/0x21

[10679.527279] [<ffffffffb992077b>] ? system_call_after_swapgs+0xc8/0x160

[10679.527283] INFO: task glusterposixfsy:14941 blocked for more than 120 seconds.

[10679.528608] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.

[10679.529956] glusterposixfsy D ffff972495f84f10 0 14941 1 0x00000080

[10679.529961] Call Trace:

[10679.529966] [<ffffffffb9913f79>] schedule+0x29/0x70

[10679.530003] [<ffffffffc060e388>] _xfs_log_force_lsn+0x2e8/0x340 [xfs]

[10679.530008] [<ffffffffb92cf1b0>] ? wake_up_state+0x20/0x20

[10679.530038] [<ffffffffc05eeb97>] xfs_file_fsync+0x107/0x1e0 [xfs]

[10679.530042] [<ffffffffb944f0e7>] do_fsync+0x67/0xb0

[10679.530046] [<ffffffffb992076f>] ? system_call_after_swapgs+0xbc/0x160

[10679.530050] [<ffffffffb944f3f3>] SyS_fdatasync+0x13/0x20

[10679.530054] [<ffffffffb992082f>] system_call_fastpath+0x1c/0x21

[10679.530058] [<ffffffffb992077b>] ? system_call_after_swapgs+0xc8/0x160

[10679.530062] INFO: task glusteriotwr13:15486 blocked for more than 120 seconds.

[10679.531805] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.

[10679.533732] glusteriotwr13 D ffff9720a83f0000 0 15486 1 0x00000080

[10679.533738] Call Trace:

[10679.533747] [<ffffffffb9913f79>] schedule+0x29/0x70

[10679.533799] [<ffffffffc060e388>] _xfs_log_force_lsn+0x2e8/0x340 [xfs]

[10679.533806] [<ffffffffb92cf1b0>] ? wake_up_state+0x20/0x20

[10679.533846] [<ffffffffc05eeb97>] xfs_file_fsync+0x107/0x1e0 [xfs]

[10679.533852] [<ffffffffb944f0e7>] do_fsync+0x67/0xb0

[10679.533858] [<ffffffffb992076f>] ? system_call_after_swapgs+0xbc/0x160

[10679.533863] [<ffffffffb944f3f3>] SyS_fdatasync+0x13/0x20

[10679.533868] [<ffffffffb992082f>] system_call_fastpath+0x1c/0x21

[10679.533873] [<ffffffffb992077b>] ? system_call_after_swapgs+0xc8/0x160

[10919.512757] INFO: task glusterclogro:14933 blocked for more than 120 seconds.

[10919.514714] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.

[10919.516663] glusterclogro D ffff97209832bf40 0 14933 1 0x00000080

[10919.516677] Call Trace:

[10919.516690] [<ffffffffb9913f79>] schedule+0x29/0x70

[10919.516696] [<ffffffffb99118e9>] schedule_timeout+0x239/0x2c0

[10919.516703] [<ffffffffb951cc04>] ? blk_finish_plug+0x14/0x40

[10919.516768] [<ffffffffc05e9224>] ? _xfs_buf_ioapply+0x334/0x460 [xfs]

[10919.516774] [<ffffffffb991432d>] wait_for_completion+0xfd/0x140

[10919.516782] [<ffffffffb92cf1b0>] ? wake_up_state+0x20/0x20

[10919.516821] [<ffffffffc05eb0a3>] ? _xfs_buf_read+0x23/0x40 [xfs]

[10919.516859] [<ffffffffc05eafa9>] xfs_buf_submit_wait+0xf9/0x1d0 [xfs]

[10919.516902] [<ffffffffc061b279>] ? xfs_trans_read_buf_map+0x199/0x400 [xfs]

[10919.516940] [<ffffffffc05eb0a3>] _xfs_buf_read+0x23/0x40 [xfs]

[10919.516977] [<ffffffffc05eb1b9>] xfs_buf_read_map+0xf9/0x160 [xfs]

[10919.517022] [<ffffffffc061b279>] xfs_trans_read_buf_map+0x199/0x400 [xfs]

[10919.517057] [<ffffffffc05c8d04>] xfs_da_read_buf+0xd4/0x100 [xfs]

[10919.517091] [<ffffffffc05c8d53>] xfs_da3_node_read+0x23/0xd0 [xfs]

[10919.517126] [<ffffffffc05c9fee>] xfs_da3_node_lookup_int+0x6e/0x2f0 [xfs]

[10919.517160] [<ffffffffc05d5a1d>] xfs_dir2_node_lookup+0x4d/0x170 [xfs]

[10919.517194] [<ffffffffc05ccf5d>] xfs_dir_lookup+0x1bd/0x1e0 [xfs]

[10919.517233] [<ffffffffc05fd8d9>] xfs_lookup+0x69/0x140 [xfs]

[10919.517271] [<ffffffffc05fa018>] xfs_vn_lookup+0x78/0xc0 [xfs]

[10919.517278] [<ffffffffb9425cf3>] lookup_real+0x23/0x60

[10919.517283] [<ffffffffb9426702>] __lookup_hash+0x42/0x60

[10919.517288] [<ffffffffb942d519>] SYSC_renameat2+0x3a9/0x5a0

[10919.517296] [<ffffffffb94d3753>] ? selinux_file_free_security+0x23/0x30

[10919.517304] [<ffffffffb992077b>] ? system_call_after_swapgs+0xc8/0x160

[10919.517309] [<ffffffffb992076f>] ? system_call_after_swapgs+0xbc/0x160

[10919.517313] [<ffffffffb992077b>] ? system_call_after_swapgs+0xc8/0x160

[10919.517318] [<ffffffffb992076f>] ? system_call_after_swapgs+0xbc/0x160

[10919.517323] [<ffffffffb942e58e>] SyS_renameat2+0xe/0x10

[10919.517328] [<ffffffffb942e5ce>] SyS_rename+0x1e/0x20

[10919.517333] [<ffffffffb992082f>] system_call_fastpath+0x1c/0x21

[10919.517339] [<ffffffffb992077b>] ? system_call_after_swapgs+0xc8/0x160

[11159.496095] INFO: task glusteriotwr9:15482 blocked for more than 120 seconds.

[11159.497546] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.

[11159.498978] glusteriotwr9 D ffff971fa0fa1fa0 0 15482 1 0x00000080

[11159.498984] Call Trace:

[11159.498995] [<ffffffffb9911f00>] ? bit_wait+0x50/0x50

[11159.498999] [<ffffffffb9913f79>] schedule+0x29/0x70

[11159.499003] [<ffffffffb99118e9>] schedule_timeout+0x239/0x2c0

[11159.499056] [<ffffffffc05dd9b7>] ? xfs_iext_bno_to_ext+0xa7/0x1a0 [xfs]

[11159.499082] [<ffffffffc05dd43e>] ? xfs_iext_bno_to_irec+0x8e/0xd0 [xfs]

[11159.499090] [<ffffffffb92f7a12>] ? ktime_get_ts64+0x52/0xf0

[11159.499093] [<ffffffffb9911f00>] ? bit_wait+0x50/0x50

[11159.499097] [<ffffffffb991348d>] io_schedule_timeout+0xad/0x130

[11159.499101] [<ffffffffb9913528>] io_schedule+0x18/0x20

[11159.499104] [<ffffffffb9911f11>] bit_wait_io+0x11/0x50

[11159.499107] [<ffffffffb9911ac1>] __wait_on_bit_lock+0x61/0xc0

[11159.499113] [<ffffffffb9393634>] __lock_page+0x74/0x90

[11159.499118] [<ffffffffb92bc210>] ? wake_bit_function+0x40/0x40

[11159.499121] [<ffffffffb9394154>] __find_lock_page+0x54/0x70

[11159.499125] [<ffffffffb9394e85>] grab_cache_page_write_begin+0x55/0xc0

[11159.499130] [<ffffffffb9484b76>] iomap_write_begin+0x66/0x100

[11159.499135] [<ffffffffb9484edf>] iomap_write_actor+0xcf/0x1d0

[11159.499140] [<ffffffffb9484e10>] ? iomap_write_end+0x80/0x80

[11159.499144] [<ffffffffb94854e7>] iomap_apply+0xb7/0x150

[11159.499149] [<ffffffffb9485621>] iomap_file_buffered_write+0xa1/0xe0

[11159.499153] [<ffffffffb9484e10>] ? iomap_write_end+0x80/0x80

[11159.499182] [<ffffffffc05f025d>] xfs_file_buffered_aio_write+0x12d/0x2c0 [xfs]

[11159.499213] [<ffffffffc05f057d>] xfs_file_aio_write+0x18d/0x1b0 [xfs]

[11159.499217] [<ffffffffb941a533>] do_sync_write+0x93/0xe0

[11159.499222] [<ffffffffb941b010>] vfs_write+0xc0/0x1f0

[11159.499225] [<ffffffffb941c002>] SyS_pwrite64+0x92/0xc0

[11159.499230] [<ffffffffb992076f>] ? system_call_after_swapgs+0xbc/0x160

[11159.499234] [<ffffffffb992082f>] system_call_fastpath+0x1c/0x21

[11159.499238] [<ffffffffb992077b>] ? system_call_after_swapgs+0xc8/0x160

[11279.488720] INFO: task xfsaild/dm-10:1134 blocked for more than 120 seconds.

[11279.490197] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.

[11279.491665] xfsaild/dm-10 D ffff9720a8660fd0 0 1134 2 0x00000000

[11279.491671] Call Trace:

[11279.491682] [<ffffffffb92a3a2e>] ? try_to_del_timer_sync+0x5e/0x90

[11279.491688] [<ffffffffb9913f79>] schedule+0x29/0x70

[11279.491744] [<ffffffffc060de36>] _xfs_log_force+0x1c6/0x2c0 [xfs]

[11279.491750] [<ffffffffb92cf1b0>] ? wake_up_state+0x20/0x20

[11279.491783] [<ffffffffc0619fec>] ? xfsaild+0x16c/0x6f0 [xfs]

[11279.491817] [<ffffffffc060df5c>] xfs_log_force+0x2c/0x70 [xfs]

[11279.491849] [<ffffffffc0619e80>] ? xfs_trans_ail_cursor_first+0x90/0x90 [xfs]

[11279.491880] [<ffffffffc0619fec>] xfsaild+0x16c/0x6f0 [xfs]

[11279.491913] [<ffffffffc0619e80>] ? xfs_trans_ail_cursor_first+0x90/0x90 [xfs]

[11279.491919] [<ffffffffb92bb161>] kthread+0xd1/0xe0

[11279.491926] [<ffffffffb92bb090>] ? insert_kthread_work+0x40/0x40

[11279.491932] [<ffffffffb9920677>] ret_from_fork_nospec_begin+0x21/0x21

[11279.491936] [<ffffffffb92bb090>] ? insert_kthread_work+0x40/0x40

[11279.491976] INFO: task glusterclogfsyn:14934 blocked for more than 120 seconds.

[11279.493466] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.

[11279.494952] glusterclogfsyn D ffff97209832af70 0 14934 1 0x00000080

[11279.494957] Call Trace:

[11279.494979] [<ffffffffc0309839>] ? __split_and_process_bio+0x2e9/0x520 [dm_mod]

[11279.494983] [<ffffffffb9913f79>] schedule+0x29/0x70

[11279.494987] [<ffffffffb99118e9>] schedule_timeout+0x239/0x2c0

[11279.494997] [<ffffffffc0309d98>] ? dm_make_request+0x128/0x1a0 [dm_mod]

[11279.495001] [<ffffffffb991348d>] io_schedule_timeout+0xad/0x130

[11279.495005] [<ffffffffb99145ad>] wait_for_completion_io+0xfd/0x140

[11279.495010] [<ffffffffb92cf1b0>] ? wake_up_state+0x20/0x20

[11279.495016] [<ffffffffb951e574>] blkdev_issue_flush+0xb4/0x110

[11279.495049] [<ffffffffc06064b9>] xfs_blkdev_issue_flush+0x19/0x20 [xfs]

[11279.495079] [<ffffffffc05eec40>] xfs_file_fsync+0x1b0/0x1e0 [xfs]

[11279.495086] [<ffffffffb944f0e7>] do_fsync+0x67/0xb0

[11279.495090] [<ffffffffb992076f>] ? system_call_after_swapgs+0xbc/0x160

[11279.495094] [<ffffffffb944f3d0>] SyS_fsync+0x10/0x20

[11279.495098] [<ffffffffb992082f>] system_call_fastpath+0x1c/0x21

[11279.495102] [<ffffffffb992077b>] ? system_call_after_swapgs+0xc8/0x160

[11279.495105] INFO: task glusterposixfsy:14941 blocked for more than 120 seconds.

[11279.496606] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.

[11279.498114] glusterposixfsy D ffff972495f84f10 0 14941 1 0x00000080

[11279.498118] Call Trace:

[11279.498134] [<ffffffffc0309839>] ? __split_and_process_bio+0x2e9/0x520 [dm_mod]

[11279.498138] [<ffffffffb9913f79>] schedule+0x29/0x70

[11279.498142] [<ffffffffb99118e9>] schedule_timeout+0x239/0x2c0

[11279.498152] [<ffffffffc0309d98>] ? dm_make_request+0x128/0x1a0 [dm_mod]

[11279.498156] [<ffffffffb991348d>] io_schedule_timeout+0xad/0x130

[11279.498160] [<ffffffffb99145ad>] wait_for_completion_io+0xfd/0x140

[11279.498165] [<ffffffffb92cf1b0>] ? wake_up_state+0x20/0x20

[11279.498169] [<ffffffffb951e574>] blkdev_issue_flush+0xb4/0x110

[11279.498202] [<ffffffffc06064b9>] xfs_blkdev_issue_flush+0x19/0x20 [xfs]

[11279.498231] [<ffffffffc05eec40>] xfs_file_fsync+0x1b0/0x1e0 [xfs]

[11279.498238] [<ffffffffb944f0e7>] do_fsync+0x67/0xb0

[11279.498242] [<ffffffffb992076f>] ? system_call_after_swapgs+0xbc/0x160

[11279.498246] [<ffffffffb944f3f3>] SyS_fdatasync+0x13/0x20

[11279.498250] [<ffffffffb992082f>] system_call_fastpath+0x1c/0x21

[11279.498254] [<ffffffffb992077b>] ? system_call_after_swapgs+0xc8/0x160

[11279.498257] INFO: task glusteriotwr1:14950 blocked for more than 120 seconds.

[11279.499789] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.

[11279.501343] glusteriotwr1 D ffff97208b6daf70 0 14950 1 0x00000080

[11279.501348] Call Trace:

[11279.501353] [<ffffffffb9913f79>] schedule+0x29/0x70

[11279.501390] [<ffffffffc060e388>] _xfs_log_force_lsn+0x2e8/0x340 [xfs]

[11279.501396] [<ffffffffb92cf1b0>] ? wake_up_state+0x20/0x20

[11279.501428] [<ffffffffc05eeb97>] xfs_file_fsync+0x107/0x1e0 [xfs]

[11279.501432] [<ffffffffb944ef3f>] generic_write_sync+0x4f/0x70

[11279.501461] [<ffffffffc05f0545>] xfs_file_aio_write+0x155/0x1b0 [xfs]

[11279.501466] [<ffffffffb941a533>] do_sync_write+0x93/0xe0

[11279.501471] [<ffffffffb941b010>] vfs_write+0xc0/0x1f0

[11279.501475] [<ffffffffb941c002>] SyS_pwrite64+0x92/0xc0

[11279.501479] [<ffffffffb992076f>] ? system_call_after_swapgs+0xbc/0x160

[11279.501483] [<ffffffffb992082f>] system_call_fastpath+0x1c/0x21

[11279.501489] [<ffffffffb992077b>] ? system_call_after_swapgs+0xc8/0x160

[11279.501493] INFO: task glusteriotwr4:14953 blocked for more than 120 seconds.

[11279.503047] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.

[11279.504630] glusteriotwr4 D ffff972499f2bf40 0 14953 1 0x00000080

[11279.504635] Call Trace:

[11279.504640] [<ffffffffb9913f79>] schedule+0x29/0x70

[11279.504676] [<ffffffffc060e388>] _xfs_log_force_lsn+0x2e8/0x340 [xfs]

[11279.504681] [<ffffffffb92cf1b0>] ? wake_up_state+0x20/0x20

[11279.504710] [<ffffffffc05eeb97>] xfs_file_fsync+0x107/0x1e0 [xfs]

[11279.504714] [<ffffffffb944f0e7>] do_fsync+0x67/0xb0

[11279.504718] [<ffffffffb992076f>] ? system_call_after_swapgs+0xbc/0x160

[11279.504722] [<ffffffffb944f3d0>] SyS_fsync+0x10/0x20

[11279.504725] [<ffffffffb992082f>] system_call_fastpath+0x1c/0x21

[11279.504730] [<ffffffffb992077b>] ? system_call_after_swapgs+0xc8/0x160

[12127.466494] perf: interrupt took too long (8263 > 8150), lowering kernel.perf_event_max_sample_rate to 24000

--------------------

I think this is the cause of the massive ovirt performance issues irrespective of gluster volume. At the time this happened, I was also ssh'ed into the host, and was doing some rpm querry commands. I had just run rpm -qa |grep glusterfs (to verify what version was actually installed), and that command took almost 2 minutes to return! Normally it takes less than 2 seconds. That is all pure local SSD IO, too....

I'm no expert, but its my understanding that anytime a software causes these kinds of issues, its a serious bug in the software, even if its mis-handled exceptions. Is this correct?

--Jim

On Tue, May 29, 2018 at 3:01 PM, Jim Kusznir <jim@palousetech.com> wrote:

I think this is the profile information for one of the volumes that lives on the SSDs and is fully operational with no down/problem disks:

[root@ovirt2 yum.repos.d]# gluster volume profile data info
Brick: ovirt2.nwfiber.com:/gluster/brick2/data
----------------------------------------------
Cumulative Stats:
Block Size: 256b+ 512b+ 1024b+
No. of Reads: 983 2696 1059
No. of Writes: 0 1113 302

Block Size: 2048b+ 4096b+ 8192b+
No. of Reads: 852 88608 53526
No. of Writes: 522 812340 76257

Block Size: 16384b+ 32768b+ 65536b+
No. of Reads: 54351 241901 15024
No. of Writes: 21636 8656 8976

Block Size: 131072b+
No. of Reads: 524156
No. of Writes: 296071
%-latency Avg-latency Min-Latency Max-Latency No. of calls Fop
--------- ----------- ----------- ----------- ------------ ----
0.00 0.00 us 0.00 us 0.00 us 4189 RELEASE
0.00 0.00 us 0.00 us 0.00 us 1257 RELEASEDIR
0.00 46.19 us 12.00 us 187.00 us 69 FLUSH
0.00 147.00 us 78.00 us 367.00 us 86 REMOVEXATTR
0.00 223.46 us 24.00 us 1166.00 us 149 READDIR
0.00 565.34 us 76.00 us 3639.00 us 88 FTRUNCATE
0.00 263.28 us 20.00 us 28385.00 us 228 LK
0.00 98.84 us 2.00 us 880.00 us 1198 OPENDIR
0.00 91.59 us 26.00 us 10371.00 us 3853 STATFS
0.00 494.14 us 17.00 us 193439.00 us 1171 GETXATTR
0.00 299.42 us 35.00 us 9799.00 us 2044 READDIRP
0.00 1965.31 us 110.00 us 382258.00 us 321 XATTROP
0.01 113.40 us 24.00 us 61061.00 us 8134 STAT
0.01 755.38 us 57.00 us 607603.00 us 3196 DISCARD
0.05 2690.09 us 58.00 us 2704761.00 us 3206 OPEN
0.10 119978.25 us 97.00 us 9406684.00 us 154 SETATTR
0.18 101.73 us 28.00 us 700477.00 us 313379 FSTAT
0.23 1059.84 us 25.00 us 2716124.00 us 38255 LOOKUP
0.47 1024.11 us 54.00 us 6197164.00 us 81455 FXATTROP
1.72 2984.00 us 15.00 us 37098954.00 us 103020 FINODELK
5.92 44315.32 us 51.00 us 24731536.00 us 23957 FSYNC
13.27 2399.78 us 25.00 us 22089540.00 us 991005 READ
37.00 5980.43 us 52.00 us 22099889.00 us 1108976 WRITE
41.04 5452.75 us 13.00 us 22102452.00 us 1349053 INODELK

Duration: 10026 seconds
Data Read: 80046027759 bytes
Data Written: 44496632320 bytes

Interval 1 Stats:
Block Size: 256b+ 512b+ 1024b+
No. of Reads: 983 2696 1059
No. of Writes: 0 838 185

Block Size: 2048b+ 4096b+ 8192b+
No. of Reads: 852 85856 51575
No. of Writes: 382 705802 57812

Block Size: 16384b+ 32768b+ 65536b+
No. of Reads: 52673 232093 14984
No. of Writes: 13499 4908 4242

Block Size: 131072b+
No. of Reads: 460040
No. of Writes: 6411
%-latency Avg-latency Min-Latency Max-Latency No. of calls Fop
--------- ----------- ----------- ----------- ------------ ----
0.00 0.00 us 0.00 us 0.00 us 2093 RELEASE
0.00 0.00 us 0.00 us 0.00 us 1093 RELEASEDIR
0.00 53.38 us 26.00 us 111.00 us 16 FLUSH
0.00 145.14 us 78.00 us 367.00 us 71 REMOVEXATTR
0.00 190.96 us 114.00 us 298.00 us 71 SETATTR
0.00 213.38 us 24.00 us 1145.00 us 90 READDIR
0.00 263.28 us 20.00 us 28385.00 us 228 LK
0.00 101.76 us 2.00 us 880.00 us 1093 OPENDIR
0.01 93.60 us 27.00 us 10371.00 us 3090 STATFS
0.02 537.47 us 17.00 us 193439.00 us 1038 GETXATTR
0.03 297.44 us 35.00 us 9799.00 us 1990 READDIRP
0.03 2357.28 us 110.00 us 382258.00 us 253 XATTROP
0.04 385.93 us 58.00 us 47593.00 us 2091 OPEN
0.04 114.86 us 24.00 us 61061.00 us 7715 STAT
0.06 444.59 us 57.00 us 333240.00 us 3053 DISCARD
0.42 316.24 us 25.00 us 290728.00 us 29823 LOOKUP
0.73 257.92 us 54.00 us 344812.00 us 63296 FXATTROP
1.37 98.30 us 28.00 us 67621.00 us 313172 FSTAT
1.58 2124.69 us 51.00 us 849200.00 us 16717 FSYNC
5.73 162.46 us 52.00 us 748492.00 us 794079 WRITE
7.19 2065.17 us 16.00 us 37098954.00 us 78381 FINODELK
36.44 886.32 us 25.00 us 2216436.00 us 925421 READ
46.30 1178.04 us 13.00 us 1700704.00 us 884635 INODELK

Duration: 7485 seconds
Data Read: 71250527215 bytes
Data Written: 5119903744 bytes

Brick: ovirt3.nwfiber.com:/gluster/brick2/data
----------------------------------------------
Cumulative Stats:
Block Size: 1b+
No. of Reads: 0
No. of Writes: 3264419
%-latency Avg-latency Min-Latency Max-Latency No. of calls Fop
--------- ----------- ----------- ----------- ------------ ----
0.00 0.00 us 0.00 us 0.00 us 90 FORGET
0.00 0.00 us 0.00 us 0.00 us 9462 RELEASE
0.00 0.00 us 0.00 us 0.00 us 4254 RELEASEDIR
0.00 50.52 us 13.00 us 190.00 us 71 FLUSH
0.00 186.97 us 87.00 us 713.00 us 86 REMOVEXATTR
0.00 79.32 us 33.00 us 189.00 us 228 LK
0.00 220.98 us 129.00 us 513.00 us 86 SETATTR
0.01 259.30 us 26.00 us 2632.00 us 137 READDIR
0.02 322.76 us 145.00 us 2125.00 us 321 XATTROP
0.03 109.55 us 2.00 us 1258.00 us 1193 OPENDIR
0.05 70.21 us 21.00 us 431.00 us 3196 DISCARD
0.05 169.26 us 21.00 us 2315.00 us 1545 GETXATTR
0.12 176.85 us 63.00 us 2844.00 us 3206 OPEN
0.61 303.49 us 90.00 us 3085.00 us 9633 FSTAT
2.44 305.66 us 28.00 us 3716.00 us 38230 LOOKUP
4.52 266.22 us 55.00 us 53424.00 us 81455 FXATTROP
6.96 1397.99 us 51.00 us 64822.00 us 23889 FSYNC
16.48 84.74 us 25.00 us 6917.00 us 932592 WRITE
30.16 106.90 us 13.00 us 3920189.00 us 1353046 INODELK
38.55 1794.52 us 14.00 us 16210553.00 us 103039 FINODELK

Duration: 66562 seconds
Data Read: 0 bytes
Data Written: 3264419 bytes

Interval 1 Stats:
Block Size: 1b+
No. of Reads: 0
No. of Writes: 794080
%-latency Avg-latency Min-Latency Max-Latency No. of calls Fop
--------- ----------- ----------- ----------- ------------ ----
0.00 0.00 us 0.00 us 0.00 us 2093 RELEASE
0.00 0.00 us 0.00 us 0.00 us 1093 RELEASEDIR
0.00 70.31 us 26.00 us 125.00 us 16 FLUSH
0.00 193.10 us 103.00 us 713.00 us 71 REMOVEXATTR
0.01 227.32 us 133.00 us 513.00 us 71 SETATTR
0.01 79.32 us 33.00 us 189.00 us 228 LK
0.01 259.83 us 35.00 us 1138.00 us 89 READDIR
0.03 318.26 us 145.00 us 2047.00 us 253 XATTROP
0.04 112.67 us 3.00 us 1258.00 us 1093 OPENDIR
0.06 167.98 us 23.00 us 1951.00 us 1014 GETXATTR
0.08 70.97 us 22.00 us 431.00 us 3053 DISCARD
0.13 183.78 us 66.00 us 2844.00 us 2091 OPEN
1.01 303.82 us 90.00 us 3085.00 us 9610 FSTAT
3.27 316.59 us 30.00 us 3716.00 us 29820 LOOKUP
5.83 265.79 us 59.00 us 53424.00 us 63296 FXATTROP
7.95 1373.89 us 51.00 us 64822.00 us 16717 FSYNC
23.17 851.99 us 14.00 us 16210553.00 us 78555 FINODELK
24.04 87.44 us 27.00 us 6917.00 us 794081 WRITE
34.36 111.91 us 14.00 us 984871.00 us 886790 INODELK

Duration: 7485 seconds
Data Read: 0 bytes
Data Written: 794080 bytes

-----------------------
Here is the data from the volume that is backed by the SHDDs and has one failed disk:
[root@ovirt2 yum.repos.d]# gluster volume profile data-hdd info
Brick: 172.172.1.12:/gluster/brick3/data-hdd
--------------------------------------------
Cumulative Stats:
Block Size: 256b+ 512b+ 1024b+
No. of Reads: 1702 86 16
No. of Writes: 0 767 71

Block Size: 2048b+ 4096b+ 8192b+
No. of Reads: 19 51841 2049
No. of Writes: 76 60668 35727

Block Size: 16384b+ 32768b+ 65536b+
No. of Reads: 1744 639 1088
No. of Writes: 8524 2410 1285

Block Size: 131072b+
No. of Reads: 771999
No. of Writes: 29584
%-latency Avg-latency Min-Latency Max-Latency No. of calls Fop
--------- ----------- ----------- ----------- ------------ ----
0.00 0.00 us 0.00 us 0.00 us 2902 RELEASE
0.00 0.00 us 0.00 us 0.00 us 1517 RELEASEDIR
0.00 197.00 us 197.00 us 197.00 us 1 FTRUNCATE
0.00 70.24 us 16.00 us 758.00 us 51 FLUSH
0.00 143.93 us 82.00 us 305.00 us 57 REMOVEXATTR
0.00 178.63 us 105.00 us 712.00 us 60 SETATTR
0.00 67.30 us 19.00 us 572.00 us 555 LK
0.00 322.80 us 23.00 us 4673.00 us 138 READDIR
0.00 336.56 us 106.00 us 11994.00 us 237 XATTROP
0.00 84.70 us 28.00 us 1071.00 us 3469 STATFS
0.01 387.75 us 2.00 us 146017.00 us 1467 OPENDIR
0.01 148.59 us 21.00 us 64374.00 us 4454 STAT
0.02 783.02 us 16.00 us 93502.00 us 1902 GETXATTR
0.03 1516.10 us 17.00 us 210690.00 us 1364 ENTRYLK
0.03 2555.47 us 300.00 us 674454.00 us 1064 READDIRP
0.07 85.74 us 19.00 us 68340.00 us 62849 FSTAT
0.07 1978.12 us 59.00 us 202596.00 us 2729 OPEN
0.22 708.57 us 15.00 us 394799.00 us 25447 LOOKUP
5.94 2331.74 us 15.00 us 1099530.00 us 207534 FINODELK
7.31 8311.75 us 58.00 us 1800216.00 us 71668 FXATTROP
12.49 7735.19 us 51.00 us 3595513.00 us 131642 WRITE
17.70 957.08 us 16.00 us 13700466.00 us 1508160 INODELK
24.55 2546.43 us 26.00 us 5077347.00 us 786060 READ
31.56 49699.15 us 47.00 us 3746331.00 us 51777 FSYNC

Duration: 10101 seconds
Data Read: 101562897361 bytes
Data Written: 4834450432 bytes

Interval 0 Stats:
Block Size: 256b+ 512b+ 1024b+
No. of Reads: 1702 86 16
No. of Writes: 0 767 71

Block Size: 2048b+ 4096b+ 8192b+
No. of Reads: 19 51841 2049
No. of Writes: 76 60668 35727

Block Size: 16384b+ 32768b+ 65536b+
No. of Reads: 1744 639 1088
No. of Writes: 8524 2410 1285

Block Size: 131072b+
No. of Reads: 771999
No. of Writes: 29584
%-latency Avg-latency Min-Latency Max-Latency No. of calls Fop
--------- ----------- ----------- ----------- ------------ ----
0.00 0.00 us 0.00 us 0.00 us 2902 RELEASE
0.00 0.00 us 0.00 us 0.00 us 1517 RELEASEDIR
0.00 197.00 us 197.00 us 197.00 us 1 FTRUNCATE
0.00 70.24 us 16.00 us 758.00 us 51 FLUSH
0.00 143.93 us 82.00 us 305.00 us 57 REMOVEXATTR
0.00 178.63 us 105.00 us 712.00 us 60 SETATTR
0.00 67.30 us 19.00 us 572.00 us 555 LK
0.00 322.80 us 23.00 us 4673.00 us 138 READDIR
0.00 336.56 us 106.00 us 11994.00 us 237 XATTROP
0.00 84.70 us 28.00 us 1071.00 us 3469 STATFS
0.01 387.75 us 2.00 us 146017.00 us 1467 OPENDIR
0.01 148.59 us 21.00 us 64374.00 us 4454 STAT
0.02 783.02 us 16.00 us 93502.00 us 1902 GETXATTR
0.03 1516.10 us 17.00 us 210690.00 us 1364 ENTRYLK
0.03 2555.47 us 300.00 us 674454.00 us 1064 READDIRP
0.07 85.73 us 19.00 us 68340.00 us 62849 FSTAT
0.07 1978.12 us 59.00 us 202596.00 us 2729 OPEN
0.22 708.57 us 15.00 us 394799.00 us 25447 LOOKUP
5.94 2334.57 us 15.00 us 1099530.00 us 207534 FINODELK
7.31 8311.49 us 58.00 us 1800216.00 us 71668 FXATTROP
12.49 7735.32 us 51.00 us 3595513.00 us 131642 WRITE
17.71 957.08 us 16.00 us 13700466.00 us 1508160 INODELK
24.56 2546.42 us 26.00 us 5077347.00 us 786060 READ
31.54 49651.63 us 47.00 us 3746331.00 us 51777 FSYNC

Duration: 10101 seconds
Data Read: 101562897361 bytes
Data Written: 4834450432 bytes

On Tue, May 29, 2018 at 2:55 PM, Jim Kusznir <jim@palousetech.com> wrote:
Thank you for your response.

I have 4 gluster volumes. 3 are replica 2 + arbitrator. replica bricks are on ovirt1 and ovirt2, arbitrator on ovirt3. The 4th volume is replica 3, with a brick on all three ovirt machines.

The first 3 volumes are on an SSD disk; the 4th is on a Seagate SSHD (same in all three machines). On ovirt3, the SSHD has reported hard IO failures, and that brick is offline. However, the other two replicas are fully operational (although they still show contents in the heal info command that won't go away, but that may be the case until I replace the failed disk).

What is bothering me is that ALL 4 gluster volumes are showing horrible performance issues. At this point, as the bad disk has been completely offlined, I would expect gluster to perform at normal speed, but that is definitely not the case.

I've also noticed that the performance hits seem to come in waves: things seem to work acceptably (but slow) for a while, then suddenly, its as if all disk IO on all volumes (including non-gluster local OS disk volumes for the hosts) pause for about 30 seconds, then IO resumes again. During those times, I start getting VM not responding and host not responding notices as well as the applications having major issues.

I've shut down most of my VMs and am down to just my essential core VMs (shedded about 75% of my VMs). I still am experiencing the same issues.

Am I correct in believing that once the failed disk was brought offline that performance should return to normal?

On Tue, May 29, 2018 at 1:27 PM, Alex K <rightkicktech@gmail.com> wrote:
I would check disks status and accessibility of mount points where your gluster volumes reside.

On Tue, May 29, 2018, 22:28 Jim Kusznir <jim@palousetech.com> wrote:
On one ovirt server, I'm now seeing these messages:
[56474.239725] blk_update_request: 63 callbacks suppressed
[56474.239732] blk_update_request: I/O error, dev dm-2, sector 0
[56474.240602] blk_update_request: I/O error, dev dm-2, sector 3905945472
[56474.241346] blk_update_request: I/O error, dev dm-2, sector 3905945584
[56474.242236] blk_update_request: I/O error, dev dm-2, sector 2048
[56474.243072] blk_update_request: I/O error, dev dm-2, sector 3905943424
[56474.243997] blk_update_request: I/O error, dev dm-2, sector 3905943536
[56474.247347] blk_update_request: I/O error, dev dm-2, sector 0
[56474.248315] blk_update_request: I/O error, dev dm-2, sector 3905945472
[56474.249231] blk_update_request: I/O error, dev dm-2, sector 3905945584
[56474.250221] blk_update_request: I/O error, dev dm-2, sector 2048

On Tue, May 29, 2018 at 11:59 AM, Jim Kusznir <jim@palousetech.com> wrote:
I see in messages on ovirt3 (my 3rd machine, the one upgraded to 4.2):

May 29 11:54:41 ovirt3 ovs-vsctl: ovs|00001|db_ctl_base|ERR|unix:/var/run/openvswitch/db.sock: database connection failed (No such file or directory)
May 29 11:54:51 ovirt3 ovs-vsctl: ovs|00001|db_ctl_base|ERR|unix:/var/run/openvswitch/db.sock: database connection failed (No such file or directory)
May 29 11:55:01 ovirt3 ovs-vsctl: ovs|00001|db_ctl_base|ERR|unix:/var/run/openvswitch/db.sock: database connection failed (No such file or directory)
(appears a lot).

I also found on the ssh session of that, some sysv warnings about the backing disk for one of the gluster volumes (straight replica 3). The glusterfs process for that disk on that machine went offline. Its my understanding that it should continue to work with the other two machines while I attempt to replace that disk, right? Attempted writes (touching an empty file) can take 15 seconds, repeating it later will be much faster.

Gluster generates a bunch of different log files, I don't know what ones you want, or from which machine(s).

How do I do "volume profiling"?

Thanks!

On Tue, May 29, 2018 at 11:53 AM, Sahina Bose <sabose@redhat.com> wrote:
Do you see errors reported in the mount logs for the volume? If so, could you attach the logs?
Any issues with your underlying disks. Can you also attach output of volume profiling?

On Wed, May 30, 2018 at 12:13 AM, Jim Kusznir <jim@palousetech.com> wrote:
Ok, things have gotten MUCH worse this morning. I'm getting random errors from VMs, right now, about a third of my VMs have been paused due to storage issues, and most of the remaining VMs are not performing well.

At this point, I am in full EMERGENCY mode, as my production services are now impacted, and I'm getting calls coming in with problems...

I'd greatly appreciate help...VMs are running VERY slowly (when they run), and they are steadily getting worse. I don't know why. I was seeing CPU peaks (to 100%) on several VMs, in perfect sync, for a few minutes at a time (while the VM became unresponsive and any VMs I was logged into that were linux were giving me the CPU stuck messages in my origional post). Is all this storage related?

I also have two different gluster volumes for VM storage, and only one had the issues, but now VMs in both are being affected at the same time and same way.

--Jim

On Mon, May 28, 2018 at 10:50 PM, Sahina Bose <sabose@redhat.com> wrote:
[Adding gluster-users to look at the heal issue]

On Tue, May 29, 2018 at 9:17 AM, Jim Kusznir <jim@palousetech.com> wrote:
Hello:

I've been having some cluster and gluster performance issues lately. I also found that my cluster was out of date, and was trying to apply updates (hoping to fix some of these), and discovered the ovirt 4.1 repos were taken completely offline. So, I was forced to begin an upgrade to 4.2. According to docs I found/read, I needed only add the new repo, do a yum update, reboot, and be good on my hosts (did the yum update, the engine-setup on my hosted engine). Things seemed to work relatively well, except for a gluster sync issue that showed up.

My cluster is a 3 node hyperconverged cluster. I upgraded the hosted engine first, then engine 3. When engine 3 came back up, for some reason one of my gluster volumes would not sync. Here's sample output:

[root@ovirt3 ~]# gluster volume heal data-hdd info
Brick 172.172.1.11:/gluster/brick3/data-hdd
/cc65f671-3377-494a-a7d4-1d9f7c3ae46c/images/48d7ecb8-7ac5-4725-bca5-b3519681cf2f/0d6080b0-7018-4fa3-bb82-1dd9ef07d9b9
/cc65f671-3377-494a-a7d4-1d9f7c3ae46c/images/647be733-f153-4cdc-85bd-ba72544c2631/b453a300-0602-4be1-8310-8bd5abe00971
/cc65f671-3377-494a-a7d4-1d9f7c3ae46c/images/6da854d1-b6be-446b-9bf0-90a0dbbea830/3c93bd1f-b7fa-4aa2-b445-6904e31839ba
/cc65f671-3377-494a-a7d4-1d9f7c3ae46c/images/7f647567-d18c-44f1-a58e-9b8865833acb/f9364470-9770-4bb1-a6b9-a54861849625
/cc65f671-3377-494a-a7d4-1d9f7c3ae46c/images/f3c8e7aa-6ef2-42a7-93d4-e0a4df6dd2fa/2eb0b1ad-2606-44ef-9cd3-ae59610a504b
/cc65f671-3377-494a-a7d4-1d9f7c3ae46c/images/b1ea3f62-0f05-4ded-8c82-9c91c90e0b61/d5d6bf5a-499f-431d-9013-5453db93ed32
/cc65f671-3377-494a-a7d4-1d9f7c3ae46c/images/8c8b5147-e9d6-4810-b45b-185e3ed65727/16f08231-93b0-489d-a2fd-687b6bf88eaa
/cc65f671-3377-494a-a7d4-1d9f7c3ae46c/images/12924435-b9c2-4aab-ba19-1c1bc31310ef/07b3db69-440e-491e-854c-bbfa18a7cff2
Status: Connected
Number of entries: 8

Brick 172.172.1.12:/gluster/brick3/data-hdd
/cc65f671-3377-494a-a7d4-1d9f7c3ae46c/images/48d7ecb8-7ac5-4725-bca5-b3519681cf2f/0d6080b0-7018-4fa3-bb82-1dd9ef07d9b9
/cc65f671-3377-494a-a7d4-1d9f7c3ae46c/images/647be733-f153-4cdc-85bd-ba72544c2631/b453a300-0602-4be1-8310-8bd5abe00971
/cc65f671-3377-494a-a7d4-1d9f7c3ae46c/images/b1ea3f62-0f05-4ded-8c82-9c91c90e0b61/d5d6bf5a-499f-431d-9013-5453db93ed32
/cc65f671-3377-494a-a7d4-1d9f7c3ae46c/images/6da854d1-b6be-446b-9bf0-90a0dbbea830/3c93bd1f-b7fa-4aa2-b445-6904e31839ba
/cc65f671-3377-494a-a7d4-1d9f7c3ae46c/images/7f647567-d18c-44f1-a58e-9b8865833acb/f9364470-9770-4bb1-a6b9-a54861849625
/cc65f671-3377-494a-a7d4-1d9f7c3ae46c/images/8c8b5147-e9d6-4810-b45b-185e3ed65727/16f08231-93b0-489d-a2fd-687b6bf88eaa
/cc65f671-3377-494a-a7d4-1d9f7c3ae46c/images/12924435-b9c2-4aab-ba19-1c1bc31310ef/07b3db69-440e-491e-854c-bbfa18a7cff2
/cc65f671-3377-494a-a7d4-1d9f7c3ae46c/images/f3c8e7aa-6ef2-42a7-93d4-e0a4df6dd2fa/2eb0b1ad-2606-44ef-9cd3-ae59610a504b
Status: Connected
Number of entries: 8

Brick 172.172.1.13:/gluster/brick3/data-hdd
/cc65f671-3377-494a-a7d4-1d9f7c3ae46c/images/b1ea3f62-0f05-4ded-8c82-9c91c90e0b61/d5d6bf5a-499f-431d-9013-5453db93ed32
/cc65f671-3377-494a-a7d4-1d9f7c3ae46c/images/8c8b5147-e9d6-4810-b45b-185e3ed65727/16f08231-93b0-489d-a2fd-687b6bf88eaa
/cc65f671-3377-494a-a7d4-1d9f7c3ae46c/images/12924435-b9c2-4aab-ba19-1c1bc31310ef/07b3db69-440e-491e-854c-bbfa18a7cff2
/cc65f671-3377-494a-a7d4-1d9f7c3ae46c/images/f3c8e7aa-6ef2-42a7-93d4-e0a4df6dd2fa/2eb0b1ad-2606-44ef-9cd3-ae59610a504b
/cc65f671-3377-494a-a7d4-1d9f7c3ae46c/images/647be733-f153-4cdc-85bd-ba72544c2631/b453a300-0602-4be1-8310-8bd5abe00971
/cc65f671-3377-494a-a7d4-1d9f7c3ae46c/images/48d7ecb8-7ac5-4725-bca5-b3519681cf2f/0d6080b0-7018-4fa3-bb82-1dd9ef07d9b9
/cc65f671-3377-494a-a7d4-1d9f7c3ae46c/images/6da854d1-b6be-446b-9bf0-90a0dbbea830/3c93bd1f-b7fa-4aa2-b445-6904e31839ba
/cc65f671-3377-494a-a7d4-1d9f7c3ae46c/images/7f647567-d18c-44f1-a58e-9b8865833acb/f9364470-9770-4bb1-a6b9-a54861849625
Status: Connected
Number of entries: 8

---------
Its been in this state for a couple days now, and bandwidth monitoring shows no appreciable data moving. I've tried repeatedly commanding a full heal from all three clusters in the node. Its always the same files that need healing.

When running gluster volume heal data-hdd statistics, I see sometimes different information, but always some number of "heal failed" entries. It shows 0 for split brain.

I'm not quite sure what to do. I suspect it may be due to nodes 1 and 2 still being on the older ovirt/gluster release, but I'm afraid to upgrade and reboot them until I have a good gluster sync (don't need to create a split brain issue). How do I proceed with this?

Second issue: I've been experiencing VERY POOR performance on most of my VMs. To the tune that logging into a windows 10 vm via remote desktop can take 5 minutes, launching quickbooks inside said vm can easily take 10 minutes. On some linux VMs, I get random messages like this:
Message from syslogd@unifi at May 28 20:39:23 ...
kernel:[6171996.308904] NMI watchdog: BUG: soft lockup - CPU#0 stuck for 22s! [mongod:14766]

(the process and PID are often different)

I'm not quite sure what to do about this either. My initial thought was upgrad everything to current and see if its still there, but I cannot move forward with that until my gluster is healed...

Thanks!
--Jim

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