Thank you for your answer, i'll update my qemu to 1.2, and try again.
于长江 | 东软 From: Eric Blake Date: 2012-11-30 23:11 To: 于长江 CC: libvirt-users Subject: 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. > Confidentiality Notice: The information contained in this e-mail and This disclaimer is unenforceable on a publicly-archived list. For netiquette reasons, it is considered better to send mail from a personal account so as to avoid your employer's useless legalese when posting to public lists. --------------------------------------------------------------------------------------------------- Confidentiality Notice: The information contained in this e-mail and any accompanying attachment(s) is intended only for the use of the intended recipient and may be confidential and/or privileged of Neusoft Corporation, its subsidiaries and/or its affiliates. If any reader of this communication is not the intended recipient, unauthorized use, forwarding, printing, storing, disclosure or copying is strictly prohibited, and may be unlawful.If you have received this communication in error,please immediately notify the sender by return e-mail, and delete the original message and all copies from your system. Thank you. ---------------------------------------------------------------------------------------------------
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