When creating an RBD volume with 'virsh vol-create-as', the newly created volume gets a stripe unit of 1 byte and a stripe count of 4194304. This results in an RBD volume which is unusably slow (in my tests, it took over 30 minutes for GRUB to load in an affected guest).
This bug has been fixed upstream for libvirt 1.2.4, but the fix has not been backported for trusty-updates. This means this functionality is broken and unusable in the current LTS.
Copied from upstream bug at https:/ /bugzilla. redhat. com/show_ bug.cgi? id=1092208:
When creating an RBD volume with 'virsh vol-create-as', the newly created volume gets a stripe unit of 1 byte and a stripe count of 4194304. This results in an RBD volume which is unusably slow (in my tests, it took over 30 minutes for GRUB to load in an affected guest).
This bug has been fixed upstream for libvirt 1.2.4, but the fix has not been backported for trusty-updates. This means this functionality is broken and unusable in the current LTS.