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

[Stanislav German-Evtushenko]

Hi Dietmar, hi Alexandre,


> Second, why do you think 'writethrough' is required for DRBD?
>

VM drives are often get corrupted when using any mode with write cache
enabled. Only directsync and writethrough do not produce the issue. Doesn't
matter if DRBD in master-master or master-slave mode.
Lars Ellenberg explains here
<http://www.gossamer-threads.com/lists/drbd/users/25946#25946> why this
happens.

Best regards,
Stanislav
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