6:03 a.m.
Hi Vinicius,
If you don't have too much VMs and you have local storage (like a raid controller)
or NFS/iSCSI - you can also move the VMs there temporarily (live storage migration)
without any interruption.
Best Regards,
Strahil Nikolov
На 10 юни 2020 г. 12:14:38 GMT+03:00, Jayme <jaymef(a)gmail.com> написа:
>This is of course not recommended but there has been times where I have
>lost network access to storage or storage sever while vms were running.
>They paused and came back up when storage was available again without
>causing any problems. This doesn’t mean it’s 100% safe but from my
>experience it has not caused any issue.
>
>Personally I would shutdown vms or live migrate the disk to secondary
>storage then migrate it back after the updates are performed.
>
>On Wed, Jun 10, 2020 at 2:22 AM Vinícius Ferrão via Users
><users(a)ovirt.org>
>wrote:
>
>>
>>
>> > On 7 Jun 2020, at 08:34, Strahil Nikolov <hunter86_bg(a)yahoo.com>
>wrote:
>> >
>> >
>> >
>> > На 7 юни 2020 г. 1:58:27 GMT+03:00, "Vinícius Ferrão via Users"
<
>> users(a)ovirt.org> написа:
>> >> Hello,
>> >>
>> >> This is a pretty vague and difficult question to answer. But what
>> >> happens if the shared storage holding the VMs is down or
>unavailable
>> >> for a period of time?
>> > Once a pending I/O is blocked, libvirt will pause the VM .
>> >
>> >> I’m aware that a longer timeout may put the VMs on pause state,
>but how
>> >> this is handled? Is it a time limit? Requests limit? Who manages
>this?
>> > You got sanlock.service that notifies the engine when a storage
>domain
>> is unaccessible for mode than 60s.
>> >
>> > Libvirt also will pause a VM when a pending I/O cannot be done.
>> >
>> >> In an event of self recovery of the storage backend what happens
>next?
>> > Usually the engine should resume the VM, and from application
>> perspective nothing has happened.
>>
>> Hmm thanks Strahil. I was thinking to upgrade the storage backend of
>one
>> of my oVirt clusters without powering off the VM’s, just to be lazy.
>>
>> The storage does not have dual controllers, so downtime is needed.
>I’m
>> trying to understand what happens so I can evaluate this update
>without
>> turning off the VMs.
>>
>> >> Manual intervention is required? The VMs may be down or they just
>> >> continue to run? It depends on the guest OS running like in
>XenServer
>> >> where different scenarios may happen?
>> >>
>> >> I’ve looked here:
>> >> https://www.ovirt.org/documentation/admin-guide/chap-Storage.html
>but
>> >> there’s nothing that goes about this question.
>> >>
>> >> Thanks,
>> >>
>> >> Sent from my iPhone
>>
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