On 04/12/2011 10:19 AM, Christian Grassi wrote: > Actually you create a doubt in my mind... > If you have a VM with lots of memory, if you just suspend the machine, > and back it up without saving the ram, in teory, as no fsync succeded > you could lose a lot of stuff which is in the filesystem cache and not > synced. > Am I wrong ?
"crash-consistent" can indeed lose data, and the amount lost increases when there is more memory to cache more in-flight operations; which is why 'virsh save'/save/'virsh restore' (full memory and disk state) is safer than 'virsh suspend'/save/'virsh resume' (crash-consistent disk space, but no memory to go along with it). -- Eric Blake [email protected] +1-801-349-2682 Libvirt virtualization library http://libvirt.org
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