Re: [libvirt] [PATCHv2 10/15] blockjob: support pivot operation on cancel
Il 06/04/2012 06:36, Eric Blake ha scritto:
if
'block_job_cancel' were made part of 'transaction', you could
copy multiple disks at the same point in time without pausing
the domain.
This is doable.
The transactioned command would do a qemu_aio_flush() in the prepare
phase, and a normal block_job_cancel in the commit phase.
This also implies we may want to add a --quiesce
flag to the pivot operation, so that when breaking a mirror, the
side of the mirror that we are abandoning is at least in a stable
state with regards to guest I/O.
I don't think this is needed. Either it makes a difference so it should
be the default, or it doesn't and then it is not a useful knob.
Paolo