[ovirt-users] VMs freezing during heals

Alastair Neil ajneil.tech at gmail.com
Fri Apr 3 20:04:30 UTC 2015 

Any follow up on this?

 Are there known issues using a replica 3 glsuter datastore with lvm thin
provisioned bricks?

On 20 March 2015 at 15:22, Alastair Neil <ajneil.tech at gmail.com> wrote:

> CentOS 6.6
>
>
>>  vdsm-4.16.10-8.gitc937927.el6
>> glusterfs-3.6.2-1.el6
>> 2.6.32 - 504.8.1.el6.x86_64
>
>
> moved to 3.6 specifically to get the snapshotting feature, hence my desire
> to migrate to thinly provisioned lvm bricks.
>
>
>
>
> On 20 March 2015 at 14:57, Darrell Budic <budic at onholyground.com> wrote:
>
>> What version of gluster are you running on these?
>>
>> I’ve seen high load during heals bounce my hosted engine around due to
>> overall system load, but never pause anything else. Cent 7 combo
>> storage/host systems, gluster 3.5.2.
>>
>>
>> On Mar 20, 2015, at 9:57 AM, Alastair Neil <ajneil.tech at gmail.com> wrote:
>>
>> Pranith
>>
>> I have run a pretty straightforward test.  I created a two brick 50 G
>> replica volume with normal lvm bricks, and installed two servers, one
>> centos 6.6 and one centos 7.0.  I kicked off bonnie++ on both to generate
>> some file system activity and then made the volume replica 3.  I saw no
>> issues on the servers.
>>
>> Not clear if this is a sufficiently rigorous test and the Volume I have
>> had issues on is a 3TB volume  with about 2TB used.
>>
>> -Alastair
>>
>>
>> On 19 March 2015 at 12:30, Alastair Neil <ajneil.tech at gmail.com> wrote:
>>
>>> I don't think I have the resources to test it meaningfully.  I have
>>> about 50 vms on my primary storage domain.  I might be able to set up a
>>> small 50 GB volume and provision 2 or 3 vms running test loads but I'm not
>>> sure it would be comparable.  I'll give it a try and let you know if I see
>>> similar behaviour.
>>>
>>> On 19 March 2015 at 11:34, Pranith Kumar Karampuri <pkarampu at redhat.com>
>>> wrote:
>>>
>>>>  Without thinly provisioned lvm.
>>>>
>>>> Pranith
>>>>
>>>> On 03/19/2015 08:01 PM, Alastair Neil wrote:
>>>>
>>>> do you mean raw partitions as bricks or simply with out thin
>>>> provisioned lvm?
>>>>
>>>>
>>>>
>>>> On 19 March 2015 at 00:32, Pranith Kumar Karampuri <pkarampu at redhat.com
>>>> > wrote:
>>>>
>>>>>  Could you let me know if you see this problem without lvm as well?
>>>>>
>>>>> Pranith
>>>>>
>>>>> On 03/18/2015 08:25 PM, Alastair Neil wrote:
>>>>>
>>>>> I am in the process of replacing the bricks with thinly provisioned
>>>>> lvs yes.
>>>>>
>>>>>
>>>>>
>>>>> On 18 March 2015 at 09:35, Pranith Kumar Karampuri <
>>>>> pkarampu at redhat.com> wrote:
>>>>>
>>>>>>  hi,
>>>>>>       Are you using thin-lvm based backend on which the bricks are
>>>>>> created?
>>>>>>
>>>>>> Pranith
>>>>>>
>>>>>> On 03/18/2015 02:05 AM, Alastair Neil wrote:
>>>>>>
>>>>>>  I have a Ovirt cluster with 6 VM hosts and 4 gluster nodes. There
>>>>>> are two virtualisation clusters one with two nehelem nodes and one with
>>>>>>  four  sandybridge nodes. My master storage domain is a GlusterFS backed by
>>>>>> a replica 3 gluster volume from 3 of the gluster nodes.  The engine is a
>>>>>> hosted engine 3.5.1 on 3 of the sandybridge nodes, with storage broviede by
>>>>>> nfs from a different gluster volume.  All the hosts are CentOS 6.6.
>>>>>>
>>>>>>   vdsm-4.16.10-8.gitc937927.el6
>>>>>>> glusterfs-3.6.2-1.el6
>>>>>>> 2.6.32 - 504.8.1.el6.x86_64
>>>>>>
>>>>>>
>>>>>>  Problems happen when I try to add a new brick or replace a brick
>>>>>> eventually the self heal will kill the VMs. In the VM's logs I see kernel
>>>>>> hung task messages.
>>>>>>
>>>>>>  Mar 12 23:05:16 static1 kernel: INFO: task nginx:1736 blocked for
>>>>>>> more than 120 seconds.
>>>>>>> Mar 12 23:05:16 static1 kernel:      Not tainted
>>>>>>> 2.6.32-504.3.3.el6.x86_64 #1
>>>>>>> Mar 12 23:05:16 static1 kernel: "echo 0 >
>>>>>>> /proc/sys/kernel/hung_task_timeout_secs" disables this message.
>>>>>>> Mar 12 23:05:16 static1 kernel: nginx         D 0000000000000001
>>>>>>> 0  1736   1735 0x00000080
>>>>>>> Mar 12 23:05:16 static1 kernel: ffff8800778b17a8 0000000000000082
>>>>>>> 0000000000000000 00000000000126c0
>>>>>>> Mar 12 23:05:16 static1 kernel: ffff88007e5c6500 ffff880037170080
>>>>>>> 0006ce5c85bd9185 ffff88007e5c64d0
>>>>>>> Mar 12 23:05:16 static1 kernel: ffff88007a614ae0 00000001722b64ba
>>>>>>> ffff88007a615098 ffff8800778b1fd8
>>>>>>> Mar 12 23:05:16 static1 kernel: Call Trace:
>>>>>>> Mar 12 23:05:16 static1 kernel: [<ffffffff8152a885>]
>>>>>>> schedule_timeout+0x215/0x2e0
>>>>>>> Mar 12 23:05:16 static1 kernel: [<ffffffff8152a503>]
>>>>>>> wait_for_common+0x123/0x180
>>>>>>> Mar 12 23:05:16 static1 kernel: [<ffffffff81064b90>] ?
>>>>>>> default_wake_function+0x0/0x20
>>>>>>> Mar 12 23:05:16 static1 kernel: [<ffffffffa0210a76>] ?
>>>>>>> _xfs_buf_read+0x46/0x60 [xfs]
>>>>>>> Mar 12 23:05:16 static1 kernel: [<ffffffffa02063c7>] ?
>>>>>>> xfs_trans_read_buf+0x197/0x410 [xfs]
>>>>>>> Mar 12 23:05:16 static1 kernel: [<ffffffff8152a61d>]
>>>>>>> wait_for_completion+0x1d/0x20
>>>>>>> Mar 12 23:05:16 static1 kernel: [<ffffffffa020ff5b>]
>>>>>>> xfs_buf_iowait+0x9b/0x100 [xfs]
>>>>>>> Mar 12 23:05:16 static1 kernel: [<ffffffffa02063c7>] ?
>>>>>>> xfs_trans_read_buf+0x197/0x410 [xfs]
>>>>>>> Mar 12 23:05:16 static1 kernel: [<ffffffffa0210a76>]
>>>>>>> _xfs_buf_read+0x46/0x60 [xfs]
>>>>>>> Mar 12 23:05:16 static1 kernel: [<ffffffffa0210b3b>]
>>>>>>> xfs_buf_read+0xab/0x100 [xfs]
>>>>>>> Mar 12 23:05:16 static1 kernel: [<ffffffffa02063c7>]
>>>>>>> xfs_trans_read_buf+0x197/0x410 [xfs]
>>>>>>> Mar 12 23:05:16 static1 kernel: [<ffffffffa01ee6a4>]
>>>>>>> xfs_imap_to_bp+0x54/0x130 [xfs]
>>>>>>> Mar 12 23:05:16 static1 kernel: [<ffffffffa01f077b>]
>>>>>>> xfs_iread+0x7b/0x1b0 [xfs]
>>>>>>> Mar 12 23:05:16 static1 kernel: [<ffffffff811ab77e>] ?
>>>>>>> inode_init_always+0x11e/0x1c0
>>>>>>> Mar 12 23:05:16 static1 kernel: [<ffffffffa01eb5ee>]
>>>>>>> xfs_iget+0x27e/0x6e0 [xfs]
>>>>>>> Mar 12 23:05:16 static1 kernel: [<ffffffffa01eae1d>] ?
>>>>>>> xfs_iunlock+0x5d/0xd0 [xfs]
>>>>>>> Mar 12 23:05:16 static1 kernel: [<ffffffffa0209366>]
>>>>>>> xfs_lookup+0xc6/0x110 [xfs]
>>>>>>> Mar 12 23:05:16 static1 kernel: [<ffffffffa0216024>]
>>>>>>> xfs_vn_lookup+0x54/0xa0 [xfs]
>>>>>>> Mar 12 23:05:16 static1 kernel: [<ffffffff8119dc65>]
>>>>>>> do_lookup+0x1a5/0x230
>>>>>>> Mar 12 23:05:16 static1 kernel: [<ffffffff8119e8f4>]
>>>>>>> __link_path_walk+0x7a4/0x1000
>>>>>>> Mar 12 23:05:16 static1 kernel: [<ffffffff811738e7>] ?
>>>>>>> cache_grow+0x217/0x320
>>>>>>> Mar 12 23:05:16 static1 kernel: [<ffffffff8119f40a>]
>>>>>>> path_walk+0x6a/0xe0
>>>>>>> Mar 12 23:05:16 static1 kernel: [<ffffffff8119f61b>]
>>>>>>> filename_lookup+0x6b/0xc0
>>>>>>> Mar 12 23:05:16 static1 kernel: [<ffffffff811a0747>]
>>>>>>> user_path_at+0x57/0xa0
>>>>>>> Mar 12 23:05:16 static1 kernel: [<ffffffffa0204e74>] ?
>>>>>>> _xfs_trans_commit+0x214/0x2a0 [xfs]
>>>>>>> Mar 12 23:05:16 static1 kernel: [<ffffffffa01eae3e>] ?
>>>>>>> xfs_iunlock+0x7e/0xd0 [xfs]
>>>>>>> Mar 12 23:05:16 static1 kernel: [<ffffffff81193bc0>]
>>>>>>> vfs_fstatat+0x50/0xa0
>>>>>>> Mar 12 23:05:16 static1 kernel: [<ffffffff811aaf5d>] ?
>>>>>>> touch_atime+0x14d/0x1a0
>>>>>>> Mar 12 23:05:16 static1 kernel: [<ffffffff81193d3b>]
>>>>>>> vfs_stat+0x1b/0x20
>>>>>>> Mar 12 23:05:16 static1 kernel: [<ffffffff81193d64>]
>>>>>>> sys_newstat+0x24/0x50
>>>>>>> Mar 12 23:05:16 static1 kernel: [<ffffffff810e5c87>] ?
>>>>>>> audit_syscall_entry+0x1d7/0x200
>>>>>>> Mar 12 23:05:16 static1 kernel: [<ffffffff810e5a7e>] ?
>>>>>>> __audit_syscall_exit+0x25e/0x290
>>>>>>> Mar 12 23:05:16 static1 kernel: [<ffffffff8100b072>]
>>>>>>> system_call_fastpath+0x16/0x1b
>>>>>>
>>>>>>
>>>>>>
>>>>>>  I am wondering if my volume settings are causing this.  Can anyone
>>>>>> with more knowledge take a look and let me know:
>>>>>>
>>>>>>  network.remote-dio: on
>>>>>>> performance.stat-prefetch: off
>>>>>>> performance.io-cache: off
>>>>>>> performance.read-ahead: off
>>>>>>> performance.quick-read: off
>>>>>>> nfs.export-volumes: on
>>>>>>> network.ping-timeout: 20
>>>>>>> cluster.self-heal-readdir-size: 64KB
>>>>>>> cluster.quorum-type: auto
>>>>>>> cluster.data-self-heal-algorithm: diff
>>>>>>> cluster.self-heal-window-size: 8
>>>>>>> cluster.heal-timeout: 500
>>>>>>> cluster.self-heal-daemon: on
>>>>>>> cluster.entry-self-heal: on
>>>>>>> cluster.data-self-heal: on
>>>>>>> cluster.metadata-self-heal: on
>>>>>>> cluster.readdir-optimize: on
>>>>>>> cluster.background-self-heal-count: 20
>>>>>>> cluster.rebalance-stats: on
>>>>>>> cluster.min-free-disk: 5%
>>>>>>> cluster.eager-lock: enable
>>>>>>> storage.owner-uid: 36
>>>>>>> storage.owner-gid: 36
>>>>>>> auth.allow:*
>>>>>>> user.cifs: disable
>>>>>>> cluster.server-quorum-ratio: 51%
>>>>>>
>>>>>>
>>>>>>  Many Thanks,  Alastair
>>>>>>
>>>>>>
>>>>>>
>>>>>>  _______________________________________________
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>>>>>>
>>>>>>
>>>>>>
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>>>>>>
>>>>>
>>>>>
>>>>
>>>>
>>>
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