[PVE-User] ZFS Checksum Error in VM but not on Host

Harald Leithner leithner at itronic.at
Tue Jul 25 09:49:22 CEST 2017

Am 24.07.2017 um 18:14 schrieb Yannis Milios:
>>> 2 reason for this, first having checksums^^, second snapshots.
>> And I prefer ZFS over any other filesystem.
> Whats the reason why ZFS is not good in a VM?
> IMHO that's a waste of system resources. Since your VM disk already lies on
> a ZFS filesystem, where it can leverage all features you said (checksums,
> snapshots etc), what's the point of having ZFS inside VM at the same time?
> ZFS is not just another f/s, it consumes a lot of resources, particularly
> RAM. Of course I don't say it's not doable, I would use it in VM just for
> testing stuff...

As you can see, the host zfs doesn't have the checksum problem, so not 
really a vaste on resources.

>> I understand the error and the solution, but not really why it happen. In
>> the meantime I got an answer from Wolfgang Link who thinks it could be a
>> bit flip in memory...
> Usually checksum errors are caused by RAM issues (other factors could be
> damaged SATA cables and more). Are you using ECC RAM on the server? I would
> suggest you to post this question on ZoL mailing list, there you can get
> much better feedback about pros and cons.

Server has no ECC (AMD Ryzen) with a Mainboard that doesn only support 
ECC in non-ECC mode (a bit useless).

But thx for you help.

> Yannis
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Harald Leithner

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