[pve-devel] Default cache mode for VM hard drives

[Stanislav German-Evtushenko]

On Nov 19, 2014 9:55 PM, "Detlef Bracker" <bracker at 1awww.com> wrote:
>
> Dear Stanislav,
>
> thats horrible: "If we try to migrate such a VM online it will crash
because data in VM's swap will be different after migration."
>
> My meaning:
>
> The migration must been blocked so long the nodes not synchron! When a
user start a migration, then a check must been run
> in background, to create an absolute synchronised machine on the other
node!
>

Not possible to do DRBD consistency check just before migration. This is
I/O expensive and time consuming operation. Normally this is done not more
often than once a week. And only at that time you can find out about out of
sync blocks.
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