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

[Stanislav German-Evtushenko]

Alexandre,

This is actually so long story I was investigating more then a year until
got this working without out-of-sync. Two Domain Controllers died because
of this. We'd been trying to replace most of hardware/firmware/disabling
TOS/etc but the issue had never gone.


> What is your vm guest os ? kernel version ?
>
Guest OS can be Windows (any) and Linux (any version).
1. It happens not often for Windows VM but when happen can be fatal.
2. It is often happen to Linux VM swap space.
3. It doesn't usually happen to Linux VM ext4 with barriers enabled and
I've seen this only happen to Linux VM ext4 with graylog2 installed on it
(java application). I don't know why, may be this application can ignore
barriers somehow. I don't understand this.


> do you have disabled barrier in /etc/fstab ?
>
Never disabled.


> What is your host storage ? (soft|hard raid ?)
>
Hardware RAID

Best regards,
Stanislav
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