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From: | Avi Kivity |
Subject: | [Qemu-devel] Re: [PATCH][RFC] Use writeback caching by default with qcow2 |
Date: | Thu, 20 Nov 2008 11:55:15 +0200 |
User-agent: | Thunderbird 2.0.0.16 (X11/20080723) |
Thomas Mueller wrote:
Right now, qcow2 isn't a reliable format regardless of the type of cache your using becausemetadata is not updated in the correct order.so you don't advise to use qcow2 as a VBD or what do you mean with "isn't reliable"?
Right, qcow2 is both very slow with cache=writethrough (or off), and may corrupt itself if the host crashes at the wrong moment.
or contrawise: on the other formats the metadata is updated in the correct order?
raw is the only format we're sure of. -- I have a truly marvellous patch that fixes the bug which this signature is too narrow to contain.
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