XCP-NG 8.3 freezes and / or reboot on HGR-SAP3 by Ovh / Using ZFS on Raid 50 / With deduplication

[olivierlambert]

Probably worth trying regular local ext SRs (in mdadm if needed) and see how it behave. KISS principle is very strong in general.

[yann_m]

Unfortunatly this is also my conclusion.

This is what I used to do with smaller servers.
This is the first time with such a "huge server" + hardware RAID + ZFS with dedup.

Thanks
Have a nice day

[olivierlambert]

It will be a lot better with future SMAPIv3 drivers (it might include ZFS if we want to officially support it)

[yann_m]

Do you think the problem could be due to ZFS deduplication ?

I just saw that it's possible to disable deduplication "without restarting" .
I think my problem is due to excessive disk writes (adding then deleting a snapshot, then coalescing?)
Without deduplication, less disk usage ?

Or am I wrong ?

[olivierlambert]

In general, at least the consensus, is to NOT use deduplication with ZFS. It's probably one cause of the issue, yes. It's not worth the RAM needed.

[yann_m]

Yes, I should probably create a new post ?
To discuss and "to survive" : how to make my current server usable again

• starting by testing with deduplication turned off.

[olivierlambert]

Let's continue there, you can always rename your thread

[yann_m]

Okay, but I can't edit the subject.

[olivierlambert]

You can edit your first post, which contains the title

[yann_m]

@olivierlambert said in HCP-NG 8.3 freezes and / or reboot on HGR-SAP3 by Ovh:

You can edit your first post, which contains the title

thanks a lot

I'll wait until next week to disable deduplication (never on Friday )