2021년 1월 24일 (일) 오전 1:22, Nir Soffer <[email protected]>님이 작성:
> On Sat, Jan 23, 2021 at 5:18 PM Henry lol <[email protected]> > wrote: > > > > Hi, > > > > according to HA VM documentation, a paused VM may be started on another > host and later resumed on the original host. > > - https://www.ovirt.org/develop/ha-vms.html > > here, I'm assuming the HA VM was paused due to I/O error. > > > > but I'm wondering how it can happen because I guess the HA VM will be > restarted on another host only after it's completely killed from the > original host. > > This is true for normal VMs, but not for HA VMs. These can be started > on another host even if we don't know if the VM is still running on the > original host. An example use case is host becoming disconnected from > the management network, or host having a hardware issue. > It means the normal VMs can be restarted by user's intervention so that it may result in the split brain?? > can you give the split brain scenario? > > HA VM is using a storage lease, so it cannot have a split brain. > > When VM is paused, it releases the lease. When VM is resumed, > it tries to acquire the lease before resuming, and resume will fail > if the lease is owned by another host. > > If you start the HA VM on another host, the other host will acquire > the storage lease. Resuming the original paused VM will fail. > > Nir > > Specifically, I assumed the PM setup and the HA VM not using the storage lease because I'm going to use MBS which doesn't support it yet AFAIK. so, I was wondering in which case the split brain can occur under this circumstance. I guess it doesn't occur as long as the user/admin doesn't manually restart VM, right? Sincerely,
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