11:11 a.m.
I know 2 approaches.
1. Use NFS hard mounting option - it will never give error to sanlock and it will be
waiting until NFS is recovered (never tries this one, but in theory might work)
2. Change the default sanlock timeout (last time I tried that - it didn't work) . You
might need help from Sandro or Sahina for that option.
Best Regards,
Strahil NikolovOn Apr 18, 2019 11:45, klaasdemter(a)gmail.com wrote:
Hi,
I got a question regarding oVirt and the support of NetApp NFS storage.
We have a MetroCluster for our virtual machine disks but a HA-Failover
of that (active IP gets assigned to another node) seems to produce
outages too long for sanlock to handle - that affects all VMs that have
storage leases. NetApp says a "worst case" takeover time is 120 seconds.
That would mean sanlock has already killed all VMs. Is anyone familiar
with how we could setup oVirt to allow such storage outages? Do I need
to use another type of storage for my oVirt VMs because that NFS
implementation is unsuitable for oVirt?
Greetings
Klaas
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1:59 a.m.
New subject: oVirt and NetApp NFS storage
Hi,
NFS hard mounts should not help with sanlock. It should just kill the VMs
after 60 seconds same as a soft mount.
The sanlock timeout: I asked RedHat support about that in a case for my RHV
environment. They said this should not be changed.
Only thing that came to my mind: disable storage leases in case of planned
storage maintenance.
Greetings
Klaas
On Thu, Apr 18, 2019, 19:10 Strahil <hunter86_bg(a)yahoo.com> wrote:
I know 2 approaches.
1. Use NFS hard mounting option - it will never give error to sanlock and
it will be waiting until NFS is recovered (never tries this one, but in
theory might work)
2. Change the default sanlock timeout (last time I tried that - it didn't
work) . You might need help from Sandro or Sahina for that option.
Best Regards,
Strahil NikolovOn Apr 18, 2019 11:45, klaasdemter(a)gmail.com wrote:
>
> Hi,
>
> I got a question regarding oVirt and the support of NetApp NFS storage.
> We have a MetroCluster for our virtual machine disks but a HA-Failover
> of that (active IP gets assigned to another node) seems to produce
> outages too long for sanlock to handle - that affects all VMs that have
> storage leases. NetApp says a "worst case" takeover time is 120 seconds.
> That would mean sanlock has already killed all VMs. Is anyone familiar
> with how we could setup oVirt to allow such storage outages? Do I need
> to use another type of storage for my oVirt VMs because that NFS
> implementation is unsuitable for oVirt?
>
>
> Greetings
>
> Klaas
> _______________________________________________
> Users mailing list -- users(a)ovirt.org
> To unsubscribe send an email to users-leave(a)ovirt.org
> Privacy Statement: https://www.ovirt.org/site/privacy-policy/
> oVirt Code of Conduct:
https://www.ovirt.org/community/about/community-guidelines/
> List Archives:
https://lists.ovirt.org/archives/list/users@ovirt.org/message/TSJJKK5UG57...
9:45 a.m.
New subject: oVirt and NetApp NFS storage
So after a little wild discussion with support it boiled down to this BZ:
https://bugzilla.redhat.com/show_bug.cgi?id=1705289 which suggests it may be a good idea
to have sanlock io_timeout configureable :)
2:16 a.m.
New subject: oVirt and NetApp NFS storage
I too am suffering from this. Whilst a proper oVirt-configuration item would be ideal, the
RFE suggests that there is a manual work-around for setting sanlock's io_timeout,
albeit not recommended. Could anyone share what it is?
It seems clear from the sanlock code that io_timeout is the only configurable item, and
that the renewal fail timeout is 8 x io_timeout. In that case, increasing the io_timeout
from the default of 10 to 15 should cover me.
https://pagure.io/sanlock/blob/master/f/src/timeouts.h
https://pagure.io/sanlock/blob/master/f/src/timeouts.c
Searching suggests two different ways. Firstly, putting, e.g. SANLOCKOPTS="-o
15", in /etc/sysconfig/sanlock, though the sanlock docs do not confirm that should
work and the search hits are all very old. Secondly, as oVirt is using libvirt, setting
io_timeout=15 in /etc/libvirt/qemu-sanlock.conf.
Does anyone know if either of those work? Or if there's another way?
Thanks,
Jon
5:27 a.m.
New subject: oVirt and NetApp NFS storage
my current idea of a workaround is to disable storage leases before netapp upgrades, and
re-enable them after upgrades are done. python sdk should make this fairly easy
(https://github.com/oVirt/ovirt-engine-sdk/blob/master/sdk/examples/set_vm...
and https://gerrit.ovirt.org/c/99712/)
3:42 a.m.
New subject: oVirt and NetApp NFS storage
So for all lease-holding vms, push the lease to a different storage domain (on different
storage hardware), apply the upgrade and then push the leases back? And that can be done
whilst the VMs are running? Leases must be frequently renewed, so I guess no particular
reason why not.
Does that work for the SPM and hosted engine as well?
I'm guessing this doesn't help with an unmanaged contoller failover. Anecdotally,
that seems to happen a bit faster for me than a managed one, which is also odd.
3:45 a.m.
New subject: oVirt and NetApp NFS storage
So for all lease-holding vms, push the lease to a different storage
domain (on different
storage hardware), apply the upgrade and then push the leases back? And that can be done
whilst the VMs are running? Leases must be frequently renewed, so I guess no particular
reason why not.
If you have the storage leases on another hardware then you do not have the same problem I
have; unless you are talking about upgrading the hardware of the storage domain that holds
the leases.
General: you can change the lease on a running VM. But (speaking for 4.2) you have to set
it to no lease first.
Does that work for the SPM and hosted engine as well?
I think the hosted engine has it's own kind of storage lease, but I can't say
anything to that. SPM does not have a storage lease it should be hardware (ie it's one
of the hypervisors) not a VM.
I'm guessing this doesn't help with an unmanaged contoller failover.
Anecdotally,
that seems to happen a bit faster for me than a managed one, which is also odd.
Yeah, all my ideas are just for planned maintenance.
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6 comments
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participants (4)
-
jon＠well.ox.ac.uk -
Klaas Demter -
klaasdemter＠gmail.com
-
Strahil