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[Qemu-devel] could i using qemu-img covert && rebase -u to do qcow2 roll


From: Huan Zhang
Subject: [Qemu-devel] could i using qemu-img covert && rebase -u to do qcow2 rollback?
Date: Wed, 30 Dec 2015 19:31:13 +0800

Hi,
We are finding a way to do rollback for qcow2 in production environment,
But we can't ensure the below way will work well, and user data are safe.

for example,
snap0.qcow2 -> snap1.qcow2 ->snap2.qcow2 -> active.qcow2

rollback to snap1 using convert && rebase -u:
1. qemu-img convert -O qcow2 snap1.qcow2 rollback.qcow2
2. qemu-img -u -b snap2.qcow2 rollback.qcow2

Test pass with data.  But in theory, could someone give me a positive answer?

Appreciate to get your reply!


Best Regards.
Huan Zhang.



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