[Users] CentOS 6.4 + Ovirt 3.2 + NFS Backend Problems
Hi Folks, i got a Setup running with the following Specs 4 VM Hosts - CentOS 6.4 - latest Ovirt 3.2 from dreyou vdsm-xmlrpc-4.10.3-0.36.23.el6.noarch vdsm-cli-4.10.3-0.36.23.el6.noarch vdsm-python-4.10.3-0.36.23.el6.x86_64 vdsm-4.10.3-0.36.23.el6.x86_64 qemu-kvm-rhev-tools-0.12.1.2-2.355.el6.5.x86_64 qemu-kvm-rhev-0.12.1.2-2.355.el6.5.x86_64 qemu-img-rhev-0.12.1.2-2.355.el6.5.x86_64 gpxe-roms-qemu-0.9.7-6.9.el6.noarch Management Node is also running latest 3.2 from dreyou ovirt-engine-cli-3.2.0.10-1.el6.noarch ovirt-engine-jbossas711-1-0.x86_64 ovirt-engine-tools-3.2.1-1.41.el6.noarch ovirt-engine-backend-3.2.1-1.41.el6.noarch ovirt-engine-sdk-3.2.0.9-1.el6.noarch ovirt-engine-userportal-3.2.1-1.41.el6.noarch ovirt-engine-setup-3.2.1-1.41.el6.noarch ovirt-engine-webadmin-portal-3.2.1-1.41.el6.noarch ovirt-engine-dbscripts-3.2.1-1.41.el6.noarch ovirt-engine-3.2.1-1.41.el6.noarch ovirt-engine-genericapi-3.2.1-1.41.el6.noarch ovirt-engine-restapi-3.2.1-1.41.el6.noarch VM are running from a Freebsd 9.1 NFS Server, which works absolutly flawless until i need to reload the /etc/exports File on the NFS Server. For this, the NFS Server itself doesnt need to be restarted, just the mountd Daemon is "Hup´ed". But after sending a HUP to the mountd, Ovirt immidiatly thinks that there was a problem with the storage backend and suspends random some VM. Luckily this VM can be resumed instant without further issues. The VM Hosts dont show any NFS related errors, so i expect the vdsm or engine to check the nfs server continous. The only thing i can find in the vdsm.log of a related host is -- snip -- Thread-539::DEBUG::2013-07-24 22:29:46,935::resourceManager::830::ResourceManager.Owner::(releaseAll) Owner.releaseAll requests {} resources {} Thread-539::DEBUG::2013-07-24 22:29:46,935::resourceManager::864::ResourceManager.Owner::(cancelAll) Owner.cancelAll requests {} Thread-539::DEBUG::2013-07-24 22:29:46,935::task::957::TaskManager.Task::(_decref) Task=`9332cd24-d899-4226-b0a2-93544ee737b4`::ref 0 aborting False libvirtEventLoop::INFO::2013-07-24 22:29:55,142::libvirtvm::2509::vm.Vm::(_onAbnormalStop) vmId=`244f6c8d-bc2b-4669-8f6d-bd957222b946`::abnormal vm stop device virtio-disk0 error e other libvirtEventLoop::DEBUG::2013-07-24 22:29:55,143::libvirtvm::3079::vm.Vm::(_onLibvirtLifecycleEvent) vmId=`244f6c8d-bc2b-4669-8f6d-bd957222b946`::event Suspended detail 2 opaque No ne libvirtEventLoop::INFO::2013-07-24 22:29:55,143::libvirtvm::2509::vm.Vm::(_onAbnormalStop) vmId=`244f6c8d-bc2b-4669-8f6d-bd957222b946`::abnormal vm stop device virtio-disk0 error e other -- snip -- i am a little bit at a dead end currently, since reloading a nfs servers export table isnt a unusual task and everything is working like expected. just ovirt seems way to picky. is there any possibility to make this check a little bit more tolerant? i try setting "sd_health_check_delay = 30" in vdsm.conf, but this didnt change anything. anyone got an idea how i can get rid of this annoying problem? Cheers, Juergen -- Sent from the Delta quadrant using Borg technology!
Maybe found a workaround on the NFS server side, a option for the mountd service -S Tell mountd to suspend/resume execution of the nfsd threads when- ever the exports list is being reloaded. This avoids intermit- tent access errors for clients that do NFS RPCs while the exports are being reloaded, but introduces a delay in RPC response while the reload is in progress. If mountd crashes while an exports load is in progress, mountd must be restarted to get the nfsd threads running again, if this option is used. so far, i was able to reload the exports list twice, without any random suspended vm. lets see if this is a real solution or if i just had luck two times. but i am still interested in parameters which make the vdsm more tolerant to short interruptions. instant suspend of a vm after such a short "outage" is not very nice. On Wed, Jul 24, 2013 at 11:04 PM, squadra <squadra@gmail.com> wrote:
Hi Folks,
i got a Setup running with the following Specs
4 VM Hosts - CentOS 6.4 - latest Ovirt 3.2 from dreyou
vdsm-xmlrpc-4.10.3-0.36.23.el6.noarch vdsm-cli-4.10.3-0.36.23.el6.noarch vdsm-python-4.10.3-0.36.23.el6.x86_64 vdsm-4.10.3-0.36.23.el6.x86_64 qemu-kvm-rhev-tools-0.12.1.2-2.355.el6.5.x86_64 qemu-kvm-rhev-0.12.1.2-2.355.el6.5.x86_64 qemu-img-rhev-0.12.1.2-2.355.el6.5.x86_64 gpxe-roms-qemu-0.9.7-6.9.el6.noarch
Management Node is also running latest 3.2 from dreyou
ovirt-engine-cli-3.2.0.10-1.el6.noarch ovirt-engine-jbossas711-1-0.x86_64 ovirt-engine-tools-3.2.1-1.41.el6.noarch ovirt-engine-backend-3.2.1-1.41.el6.noarch ovirt-engine-sdk-3.2.0.9-1.el6.noarch ovirt-engine-userportal-3.2.1-1.41.el6.noarch ovirt-engine-setup-3.2.1-1.41.el6.noarch ovirt-engine-webadmin-portal-3.2.1-1.41.el6.noarch ovirt-engine-dbscripts-3.2.1-1.41.el6.noarch ovirt-engine-3.2.1-1.41.el6.noarch ovirt-engine-genericapi-3.2.1-1.41.el6.noarch ovirt-engine-restapi-3.2.1-1.41.el6.noarch
VM are running from a Freebsd 9.1 NFS Server, which works absolutly flawless until i need to reload the /etc/exports File on the NFS Server. For this, the NFS Server itself doesnt need to be restarted, just the mountd Daemon is "Hup´ed".
But after sending a HUP to the mountd, Ovirt immidiatly thinks that there was a problem with the storage backend and suspends random some VM. Luckily this VM can be resumed instant without further issues.
The VM Hosts dont show any NFS related errors, so i expect the vdsm or engine to check the nfs server continous.
The only thing i can find in the vdsm.log of a related host is
-- snip --
Thread-539::DEBUG::2013-07-24 22:29:46,935::resourceManager::830::ResourceManager.Owner::(releaseAll) Owner.releaseAll requests {} resources {} Thread-539::DEBUG::2013-07-24 22:29:46,935::resourceManager::864::ResourceManager.Owner::(cancelAll) Owner.cancelAll requests {} Thread-539::DEBUG::2013-07-24 22:29:46,935::task::957::TaskManager.Task::(_decref) Task=`9332cd24-d899-4226-b0a2-93544ee737b4`::ref 0 aborting False libvirtEventLoop::INFO::2013-07-24 22:29:55,142::libvirtvm::2509::vm.Vm::(_onAbnormalStop) vmId=`244f6c8d-bc2b-4669-8f6d-bd957222b946`::abnormal vm stop device virtio-disk0 error e other libvirtEventLoop::DEBUG::2013-07-24 22:29:55,143::libvirtvm::3079::vm.Vm::(_onLibvirtLifecycleEvent) vmId=`244f6c8d-bc2b-4669-8f6d-bd957222b946`::event Suspended detail 2 opaque No ne libvirtEventLoop::INFO::2013-07-24 22:29:55,143::libvirtvm::2509::vm.Vm::(_onAbnormalStop) vmId=`244f6c8d-bc2b-4669-8f6d-bd957222b946`::abnormal vm stop device virtio-disk0 error e other
-- snip --
i am a little bit at a dead end currently, since reloading a nfs servers export table isnt a unusual task and everything is working like expected. just ovirt seems way to picky.
is there any possibility to make this check a little bit more tolerant?
i try setting "sd_health_check_delay = 30" in vdsm.conf, but this didnt change anything.
anyone got an idea how i can get rid of this annoying problem?
Cheers,
Juergen
--
Sent from the Delta quadrant using Borg technology!
-- Sent from the Delta quadrant using Borg technology!
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Hi Karli, i already thought that i am the only one with that combination ;) On Mon, Jul 29, 2013 at 1:11 PM, Karli Sjöberg <Karli.Sjoberg@slu.se> wrote:
** ons 2013-07-24 klockan 23:35 +0200 skrev squadra:
Maybe found a workaround on the NFS server side, a option for the mountd service
-S Tell mountd to suspend/resume execution of the nfsd threads when-
ever the exports list is being reloaded. This avoids intermit-
tent access errors for clients that do NFS RPCs while the exports
are being reloaded, but introduces a delay in RPC response while
the reload is in progress. If mountd crashes while an exports
load is in progress, mountd must be restarted to get the nfsd
threads running again, if this option is used.
so far, i was able to reload the exports list twice, without any random suspended vm. lets see if this is a real solution or if i just had luck two times.
It would seem as if we are on the same boat:) Actually I hadn´t thought about it before, but you´re right; issuing a "service mountd reload" does pause a large number of VM´s, frickin annoying really. I mean, the NFS server doesn´t care what or who it´s serving, you could be creating a new export for a completely different system, and not even have oVirt in mind before customers start to call, wondering why their VM´s have stopped responding!?
exactly the same i have
I actually tried that "-S" but it didn´t work for me at all, and looking at the man-page for mountd, there´s no mention of it either, even though we are presumably running the same version: # uname -r 9.1-RELEASE
Or are you perhaps tracking "-STABLE", and there´s a minor difference there?
i am tracking -STABLE, but the Man Page of "mountd" on a 9.1 Stable (Snapshot Release) also shows -S Parameter 9.1-STABLE FreeBSD 9.1-STABLE #0: Sun Jul 7 10:53:46 UTC 2013 root@snap.freebsd.org:/usr/obj/usr/src/sys/GENERIC amd64 9.2-PRERELEASE FreeBSD 9.2-PRERELEASE #6: Thu Jul 18 02:41:57 CEST 2013 root@filer1.intern. ´ both systems provide -S for the mountd, and so far i didnt have any more problems. lets see if this keeps going good.
but i am still interested in parameters which make the vdsm more tolerant to short interruptions. instant suspend of a vm after such a short "outage" is not very nice.
+1!
/Karli
Cheers, Juergen -- Sent from the Delta quadrant using Borg technology!
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On Mon, Jul 29, 2013 at 1:46 PM, Karli Sjöberg <Karli.Sjoberg@slu.se> wrote:
** mån 2013-07-29 klockan 13:26 +0200 skrev squadra:
Hi Karli,
i already thought that i am the only one with that combination ;)
Well, I happen to be using Fedora as engine/hosts, but when it comes to the NFS-server, why settle for anything less, right?:) I imagine you´re in it for the same reason as me too; "the last word in filesystems"...
exactly :)
On Mon, Jul 29, 2013 at 1:11 PM, Karli Sjöberg <Karli.Sjoberg@slu.se> wrote:
ons 2013-07-24 klockan 23:35 +0200 skrev squadra:
Maybe found a workaround on the NFS server side, a option for the mountd service
-S Tell mountd to suspend/resume execution of the nfsd threads when- ever the exports list is being reloaded. This avoids intermit- tent access errors for clients that do NFS RPCs while the exports are being reloaded, but introduces a delay in RPC response while the reload is in progress. If mountd crashes while an exports load is in progress, mountd must be restarted to get the nfsd threads running again, if this option is used.
so far, i was able to reload the exports list twice, without any random suspended vm. lets see if this is a real solution or if i just had luck two times.
It would seem as if we are on the same boat:) Actually I hadn´t thought about it before, but you´re right; issuing a "service mountd reload" does pause a large number of VM´s, frickin annoying really. I mean, the NFS server doesn´t care what or who it´s serving, you could be creating a new export for a completely different system, and not even have oVirt in mind before customers start to call, wondering why their VM´s have stopped responding!?
exactly the same i have
I actually tried that "-S" but it didn´t work for me at all, and looking at the man-page for mountd, there´s no mention of it either, even though we are presumably running the same version: # uname -r 9.1-RELEASE
Or are you perhaps tracking "-STABLE", and there´s a minor difference there?
i am tracking -STABLE, but the Man Page of "mountd" on a 9.1 Stable (Snapshot Release) also shows -S Parameter
9.1-STABLE FreeBSD 9.1-STABLE #0: Sun Jul 7 10:53:46 UTC 2013 root@snap.freebsd.org:/usr/obj/usr/src/sys/GENERIC amd64
9.2-PRERELEASE FreeBSD 9.2-PRERELEASE #6: Thu Jul 18 02:41:57 CEST 2013 root@filer1.intern.
OK, so we´re not using the same versions, -STABLE != -RELEASE, and I only use -RELEASE. But that explains it. I guess I can wait for 9.2-RELEASE to get rid of that nuisance. Thanks for the info!
Just checked the changes in -stable, here we go... http://svnweb.freebsd.org/base/stable/9/usr.sbin/mountd/mountd.c?revision=243739&view=markup 9.2 is not so far away :) Cheers, Juergen -- Sent from the Delta quadrant using Borg technology!
participants (2)
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Karli Sjöberg -
squadra