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From: | Anthony Liguori |
Subject: | Re: [Qemu-devel] Storage requirements for live migration |
Date: | Fri, 11 Nov 2011 17:23:42 -0600 |
User-agent: | Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.2.21) Gecko/20110831 Lightning/1.0b2 Thunderbird/3.1.13 |
On 11/11/2011 04:43 PM, Ryan Harper wrote:
== Image Formats == Image formats are not safe to use with live migration. The reason is that QEMU caches data for image formats and does not have a mechanism to flush those caches. The following attempts to describe the issues with the various formats === QCOW2 === QCOW2 caches two forms of data, cluster metadata (L1/L2 data, refcount table, etc) and mutable header information (file size, snapshot entries, etc). This data needs to be discarded before after migration starts.before after? pick one =)
Er, the sentence is intelligible with either word. I've updated the wiki with something that actually makes sense :-)
Regards, Anthony Liguori
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