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[Qemu-discuss] Disk Caching when domain is suspended.

From: Matthew Schumacher
Subject: [Qemu-discuss] Disk Caching when domain is suspended.
Date: Wed, 14 Nov 2018 11:50:09 -0900
User-agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.14; rv:60.0) Gecko/20100101 Thunderbird/60.3.0

Qemu devs,

I have a process where I suspend a domain, then migrate some of it's disk elsewhere, then live migrate (to copy cpu state and memory) the domain to another host and resume.  The migration is marked unsafe in libvirt because disk caching is enabled even though the domain is in the suspend state.

Can someone confirm that the disk cache is flushed as part of the suspend process?  If not, it seems reasonable that you would want the disk completely quiesced while the domain was in the suspend state so that you can perform tasks without worry that the disk is still changing.


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