When a storage error occurs, VMs should pause, not migrate. However, if the VMs were io-idle, then pause (qemu EIO) might have not been triggered before hosts started dropping into non-op. 
...which triggered a migration storm for HA-enabled VMs, racing with VMs pausing somehow (can't tell without diving into the logs for sure).

I haven't seen it happen in any of my setups, probably a new issue

On Wed, Feb 3, 2016 at 9:39 AM, Mark Steele <msteele@telvue.com> wrote:
Hello,

I'd like to know if there is a way to configure ovirt (oVirt Engine Version: 3.5.0.1-1.el6) to NOT migrate VM's when there is a problem with attached storage.

Scenario - our storage array that hosts all our VM disks failed. When that happened, ovirt attempted to migrate running VM's from one host to another. Unfortunately this left many of the VM's in a 'migrating to' state that could only be resolved by restarting the HV's

I'd prefer to have ovirt simply hang the VM's until disk IO returns.

Is this possible?

***
Mark Steele
CIO / VP Technical Operations | TelVue Corporation
TelVue - We Share Your Vision

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