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[Qemu-discuss] qemu snapshot and convert while live.

From: Matthew Sellers
Subject: [Qemu-discuss] qemu snapshot and convert while live.
Date: Wed, 13 Nov 2013 14:12:27 -0600

Hi Everyone,

I am running a KVM test cluster on Fedora 19 using gluster + libgfapi as a network backened for my QCOW2 images.   This configuration precludes me from using virsh's backup freatures provided in Fedora and thus I am doing "live snapshots" by executing:
# perform intenal snapshot on qcow2 using FUSE mount to gluster:
qemu-img snapshot -c snapname /gluster/test.qcow2

# convert the snapshot to an external file for archiving:
qemu-img convert -s snapname /gluster/test.qcow2 /gluster-backup/test.qcow2.snapshop

My Question:

1. Is there any blocking or locking issues I should be concerned about while doing snapshot's or converts?   I have done this procedure under light I/O load and expeineced no issues.

2. I know this leaves my snapshot in an inconsistent state...but is this an incorrect use of the qemu/qcow2 tools?

Im digging into libvirt to figure out how to support snapshot-create-as/blockpull issues...hopefully i will find a resolution soon.


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