Hi List! Hope some one can help me, we had a big issue in our cloud the other day, a couple of our openstack regions ( +2000 kvm guests with qcow2 ) went read only filesystem from the guest side because the backing files directory (the openstack _base directory) was compromised and the data was lost, when we realized the data was lost, it took us 5 mins to restore the backup of the backing files, but by that time all the kvm guests received some kind of IO error from the hypervisor layer, and went read only on root filesystem.
My question would be, is there a way to hold the IO operations against the backing files ( i thought that would be 99% READ operations ) for a little longer ( im asking this because i dont quite understand what is the process and when it raises the error ) in a case the backing files are missing (no IO possible) but is recoverable within minutes ? Any tip on how to achieve this if possible, or information about how backing files works on kvm, will be amazing. Waiting for feedback! kindest regards. Alejandro Comisario -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
