Re: [libvirt-users] error: argument unsupported: unable to handle disk requests in snapshot
Hello, a problem occurred during making a snapshot for a guest, ask
for help...
1. the xml for snapshotdomain like this:
# cat deployment.1
<domainsnapshot>
<name>a</name>
<disks>
<disk name='/home/qcow2/disk.0'>
<driver type='qcow2'/>
<source file='/home/qcow2/disk.3'/>
</disk>
This says that you want to create an external snapshot...
</disks>
</domainsnapshot>
2. when i execute the command , a mistake occurred:
# virsh snapshot-create qcow2 deployment.1
But this did not request the --disk-only flag, and was not executed
with (unreleased) libvirt 1.0.1. Older libvirt doesn't support
external snapshots without the --disk-only flag (but the next
release will; assuming that you have new enough qemu).
error: argument unsupported: unable to handle disk requests in
snapshot
3. i add the parameter '--disk-only', another mistake occurred:
# virsh snapshot-create qcow2 deployment.1 --disk-only
error: Failed to take snapshot: unknown command: 'snapshot_blkdev'
This says your qemu is too old. External snapshots were not possible
until upstream qemu 1.2; it is also available if you use RHEV 3.0
from Red Hat (but NOT if you use RHEL 6.3).
is there anyone has the same problem with me ?
Yes, since you are trying code that hasn't been implemented
for the versions of software you have installed.
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