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El 2016-04-30 21:45, Nir Soffer escribió:
On Sat, Apr 30, 2016 at 11:33 AM, Nicolás <nicolas(a)devels.es>
wrote:
> Hi Nir,
>
> El 29/04/16 a las 22:34, Nir Soffer escribió:
>>
>> On Fri, Apr 29, 2016 at 9:17 PM, <nicolas(a)devels.es> wrote:
>>>
>>> Hi,
>>>
>>> We're running oVirt 3.6.5.3-1 and lately we're experiencing some
>>> issues
>>> with
>>> some VMs being paused because they're marked as non-responsive.
>>> Mostly,
>>> after a few seconds they recover, but we want to debug precisely
>>> this
>>> problem so we can fix it consistently.
>>>
>>> Our scenario is the following:
>>>
>>> ~495 VMs, of which ~120 are constantly up
>>> 3 datastores, all of them iSCSI-based:
>>> * ds1: 2T, currently has 276 disks
>>> * ds2: 2T, currently has 179 disks
>>> * ds3: 500G, currently has 65 disks
>>> 7 hosts: All have mostly the same hardware. CPU and memory are
>>> currently
>>> very lowly used (< 10%).
>>>
>>> ds1 and ds2 are physically the same backend which exports two 2TB
>>> volumes.
>>> ds3 is a different storage backend where we're currently migrating
>>> some
>>> disks from ds1 and ds2.
>>
>> What the the storage backend behind ds1 and 2?
>
>
> The storage backend for ds1 and ds2 is the iSCSI-based HP LeftHand
> P4000 G2.
>
>>> Usually, when VMs become unresponsive, the whole host where they run
>>> gets
>>> unresponsive too, so that gives a hint about the problem, my bet is
>>> the
>>> culprit is somewhere on the host side and not on the VMs side.
>>
>> Probably the vm became unresponsive because connection to the host
>> was
>> lost.
>
>
> I forgot to mention that less commonly we have situations where the
> host
> doesn't get unresponsive but the VMs on it do and they don't become
> responsive ever again, so we have to forcibly power them off and start
> them
> on a different host. But in this case the connection with the host
> doesn't
> ever get lost (so basically the host is Up, but any VM run on them is
> unresponsive).
>
>
>>> When that
>>> happens, the host itself gets non-responsive and only recoverable
>>> after
>>> reboot, since it's unable to reconnect.
>>
>> Piotr, can you check engine log and explain why host is not
>> reconnected?
>>
>>> I must say this is not specific to
>>> this oVirt version, when we were using v.3.6.4 the same happened,
>>> and
>>> it's
>>> also worthy mentioning we've not done any configuration changes and
>>> everything had been working quite well for a long time.
>>>
>>> We were monitoring our ds1 and ds2 physical backend to see
>>> performance
>>> and
>>> we suspect we've run out of IOPS since we're reaching the maximum
>>> specified
>>> by the manufacturer, probably at certain times the host cannot
>>> perform a
>>> storage operation within some time limit and it marks VMs as
>>> unresponsive.
>>> That's why we've set up ds3 and we're migrating ds1 and ds2 to
ds3.
>>> When
>>> we
>>> run out of space on ds3 we'll create more smaller volumes to keep
>>> migrating.
>>>
>>> On the host side, when this happens, we've run repoplot on the vdsm
>>> log
>>> and
>>> I'm attaching the result. Clearly there's a *huge* LVM response time
>>> (~30
>>> secs.).
>>
>> Indeed the log show very slow vgck and vgs commands - these are
>> called
>> every
>> 5 minutes for checking the vg health and refreshing vdsm lvm cache.
>>
>> 1. starting vgck
>>
>> Thread-96::DEBUG::2016-04-29
>> 13:17:48,682::lvm::290::Storage.Misc.excCmd::(cmd) /usr/bin/taskset
>> --cpu-list 0-23 /usr/bin/sudo -n /usr/sbin/lvm vgck --config '
>> devices
>> { pre
>> ferred_names = ["^/dev/mapper/"] ignore_suspended_devices=1
>> write_cache_state=0 disable_after_error_count=3 filter = [
>> '\''a|/dev/mapper/36000eb3a4f1acbc20000000000000043|'\
>> '', '\''r|.*|'\'' ] } global { locking_type=1
>> prioritise_write_locks=1 wait_for_locks=1 use_lvmetad=0 } backup {
>> retain_min = 50 retain_days = 0 } ' 5de4a000-a9c4-48
>> 9c-8eee-10368647c413 (cwd None)
>>
>> 2. vgck ends after 55 seconds
>>
>> Thread-96::DEBUG::2016-04-29
>> 13:18:43,173::lvm::290::Storage.Misc.excCmd::(cmd) SUCCESS: <err> = '
>> WARNING: lvmetad is running but disabled. Restart lvmetad before
>> enabling it!\n'; <rc> = 0
>>
>> 3. starting vgs
>>
>> Thread-96::DEBUG::2016-04-29
>> 13:17:11,963::lvm::290::Storage.Misc.excCmd::(cmd) /usr/bin/taskset
>> --cpu-list 0-23 /usr/bin/sudo -n /usr/sbin/lvm vgs --config ' devices
>> { pref
>> erred_names = ["^/dev/mapper/"] ignore_suspended_devices=1
>> write_cache_state=0 disable_after_error_count=3 filter = [
>> '\''a|/dev/mapper/36000eb3a4f1acbc20000000000000043|/de
>>
>>
v/mapper/36000eb3a4f1acbc200000000000000b9|/dev/mapper/360014056f0dc8930d744f83af8ddc709|/dev/mapper/WDC_WD5003ABYZ-011FA0_WD-WMAYP0J73DU6|'\'',
>> '\''r|.*|'\'' ] } global {
>> locking_type=1 prioritise_write_locks=1 wait_for_locks=1
>> use_lvmetad=0 } backup { retain_min = 50 retain_days = 0 } '
>> --noheadings --units b --nosuffix --separator '|
>> ' --ignoreskippedcluster -o
>>
>>
uuid,name,attr,size,free,extent_size,extent_count,free_count,tags,vg_mda_size,vg_mda_free,lv_count,pv_count,pv_name
>> 5de4a000-a9c4-489c-8eee-10368
>> 647c413 (cwd None)
>>
>> 4. vgs finished after 37 seconds
>>
>> Thread-96::DEBUG::2016-04-29
>> 13:17:48,680::lvm::290::Storage.Misc.excCmd::(cmd) SUCCESS: <err> = '
>> WARNING: lvmetad is running but disabled. Restart lvmetad before
>> enabling it!\n'; <rc> = 0
>>
>> Zdenek, how do you suggest to debug this slow lvm commands?
>>
>> Can you run the following commands on a host in trouble, and on some
>> other
>> hosts in the same timeframe?
>>
>> time vgck -vvvv --config ' devices { filter =
>>
['\''a|/dev/mapper/36000eb3a4f1acbc20000000000000043|'\'',
>> '\''r|.*|'\'' ] } global { locking_type=1
prioritise_write_locks=1
>> wait_for_locks=1 use_lvmetad=0 } backup { retain_min = 50
>> retain_days = 0 } ' 5de4a000-a9c4-489c-8eee-10368647c413
>>
>> time vgs -vvvv --config ' global { locking_type=1
>> prioritise_write_locks=1 wait_for_locks=1 use_lvmetad=0 } backup {
>> retain_min = 50 retain_days = 0 } '
>> 5de4a000-a9c4-489c-8eee-10368647c413
>>
>> Note that I added -vvvv to both commands, this will generate huge
>> amount
>> of debugging info. Please share the output of these commands.
>>
>> You may need to fix the commands. You can always copy and paste
>> directly
>> from vdsm log into the shell and add the -vvvv flag.
>>
>
> Indeed, there seems to be a big difference on hosts 5 and 6. I'm
> attaching
> the results of the execution of both commands on all hosts. Both
> commands
> show a pretty bigger output on hosts 5 and 6, and also a much bigger
> execution time. Times are also attached in a file called TIMES.
>
>>> Our host storage network is correctly configured and on a 1G
>>> interface, no errors on the host itself, switches, etc.
>>
>> 1G serving about 20-70 vms per host? (495 vms, 120 always up, 7
>> hosts)?
>>
>> Do you have separate network for management and storage, or both
>> use this 1G interface?
>
>
> Yes, we have separate networks for management, storage and motion.
> Storage
> and motion have 1G each (plus, for storage we use a bond of 2
> interfaces in
> ALB-mode (6)). Currently no host has more than 30 VMs at a time.
>
>>> We've also limited storage in QoS to use 10MB/s and 40 IOPS,
>>
>> How did you configure this limit?
>
>
> In the Data Center tab, I chose our DC and a QoS sub-tab appears, just
> like
> described here: http://www.ovirt.org/documentation/sla/network-qos/
>
>>
>>> but this issue
>>> still happens, which leads me to be concerned whether this is not
>>> just an
>>> IOPS issue; each host handles about cca. 600 LVs. Could this be an
>>> issue
>>> too? I remark the LVM response times are low in normal conditions
>>> (~1-2
>>> seconds).
>>
>> We recommend to limit number lvs per vg to 350. If you have 276 disks
>> on
>> ds1, and the disks are using snapshots, you may have too many lvs,
>> which
>> can cause slowdowns in lvm operations.
>>
>> Can you share the output of:
>>
>> vdsm-tool dump-volume-chains 5de4a000-a9c4-489c-8eee-10368647c413
>
>
> Ok, right now no VG has more than 350 VGs so I guess this is not
> currently
> the problem. Unfortunately, I run the vdsm-tool command but it didn't
> end
> nor provide any output in cca. 1 hour, so I guess it was hanged and I
> stopped it.
This is not normal, but I never tried it on a big setup. Basically it
uses vdsm apis
to locate all images and volumes, and it this is too slow, it means
accessing storage
is too slow.
Did you try to run it on other hosts? (a.g. host1?)
Does it complete in reasonable time after cleaning the stale devices?
> If you confirm this is a normal execution time I can leave it
> running whatever time it takes.
>
> host5:~# vgs
> VG #PV #LV #SN Attr VSize VFree
> 0927c050-6fb6-463c-bb37-8b8da641dcd3 1 63 0 wz--n- 499,62g
> 206,50g
> 5de4a000-a9c4-489c-8eee-10368647c413 1 335 0 wz--n- 2,00t
> 518,62g
> b13b9eac-1f2e-4a7e-bcd9-49f5f855c3d8 1 215 0 wz--n- 2,00t
> 495,25g
> sys_vg 1 6 0 wz--n- 136,44g
> 122,94g
>>>
>>> I'm attaching the vdsm.log, engine.log and repoplot PDF;
>>
>> This is very useful, thanks. Can you send also the vdsm logs and
>> repoplots
>> from other hosts for the same timeframe?
>>
>>> if someone could
>>> give a hint on some additional problems in them and shed some light
>>> on
>>> the
>>> above thoughts I'd be very grateful.
>>
>> Do you have sar configured on the host? having sar logs can reveal
>> more
>> info about this timeframe.
>>
>> Do you have information about amount of io from vms during this
>> timeframe?
>> amount of io on the storage backend during this timeframe?
>
>
> Not currently, but I'll be alert for the time this happens again and
> I'll
> check some sar commands related to I/O and I'll provide feedback.
> Nevertheless, by the time I run the commands above no machine was
> unresponsive and I'm still getting such huge execution times. I tried
> running iotop now and I see there are 2 vgck and vgs processes with a
> rate
> of ~500Kb/s each for reading.
>
> root 24446 1.3 0.0 57008 6824 ? D< 09:15 0:00
> /usr/sbin/lvm vgs --config devices { preferred_names =
> ["^/dev/mapper/"]
> ignore_suspended_devices=1 write_cache_state=0
> disable_after_error_count=3
> filter = [
>
'a|/dev/mapper/36000eb3a4f1acbc20000000000000043|/dev/mapper/36000eb3a4f1acbc200000000000000b9|/dev/mapper/360014056f0dc8930d744f83af8ddc709|',
> 'r|.*|' ] } global { locking_type=1 prioritise_write_locks=1
> wait_for_locks=1 use_lvmetad=0 } backup { retain_min = 50
> retain_days = 0
> } --noheadings --units b --nosuffix --separator |
> --ignoreskippedcluster -o
>
uuid,name,attr,size,free,extent_size,extent_count,free_count,tags,vg_mda_size,vg_mda_free,lv_count,pv_count,pv_name
> b13b9eac-1f2e-4a7e-bcd9-49f5f855c3d8
>
> I'm also attaching the iostat output for host 5 in a file called
> iostat-host5.
>
> Thank you very much.
>
> Nicolás
>
>> Nir
>
>
The loop you provided indeed seems to solve the issue (at least as a
workaround). Today host5 has been flapping all day with VMs becoming
unresponsive and responsive again, and after running the loop VMs
stopped being unresponsive, plus execution times became normal again
(~1-2 secs, as the other hosts).
After clearing stale devices, I tried running the vdsm-tool command
again and this time successfully (it took about 1:30 min to finish).
Also, running the same command on host1 took 2:15 min. but that is
because I've not run the script on this host and it still has some stale
devices, so I guess this is reasonable execution time. I'm attaching the
results here.
I've also filed a bug report in [1] with all relevant information, I
hope I didn't forget anything important.
Thanks for your help and for taking the time to help debugging this
issue.
Nicolás
[1]: https://bugzilla.redhat.com/show_bug.cgi?id=1331978
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