[ovirt-devel] Improving VM behavior in case of IO errors

Hello, In OVirt, we have a property propagate_error at the disk level that decides in case of an error, how this error be propagated to the VM. This value is maintained in the database table with the default value set as Off. The default setting(Off) results in a policy that ends up pausing the VM rather than propagating the errors to VM.  There is no provision in the UI currently to configure this property for disk (images or luns). So there is no easy way to set this value.  Further, even if the value is manually set to "On" in db, it gets overwriiten by UI everytime some other property is updated as described here - https://bugzilla.redhat.com/show_bug.cgi?id=1669367 Setting the value to "Off" is not ideal for multipath devices where a single path failure causes vm to pause. It puts serious restrictions for the DR situation and unlike VMWare * Hyper-V, oVirt is not able to support the DR functionality - https://bugzilla.redhat.com/show_bug.cgi?id=1314160 While we wait for RFE, the proposal here is to revise the out of the box behavior for LUNs. For LUNs, we should propagate the errors to VM rather than directly stopping those. This will allow us to handle short-term multipath outages and improve availability. This is a simple change in behavior but will have good positive impact. I would like to seek feedback about this to make sure that everyone is ok with the proposal. Thanks, Shubha