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Anyone running ZFS? (lemmy.fwgx.uk)

submitted 2 months ago* (last edited 2 months ago) by [email protected] to c/[email protected]

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At the moment I have my NAS setup as a Proxmox VM with a hardware RAID card handling 6 2TB disks. My VMs are running on NVMEs with the NAS VM handling the data storage with the RAIDed volume passed through to the VM direct in Proxmox. I am running it as a large ext4 partition. Mostly photos, personal docs and a few films. Only I really use it. My desktop and laptop mount it over NFS. I have restic backups running weekly to two external HDDs. It all works pretty well and has for years.

I am now getting ZFS curious. I know I'll need to IT flash the HBA, or get another. I'm guessing it's best to create the zpool in Proxmox and pass that through to the NAS VM? Or would it be better to pass the individual disks through to the VM and manage the zpool from there?

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[–] [email protected] -3 points 2 months ago (2 children)

If I recall correctly it’s important to be running ECC memory right?

Otherwise corrupter bites/data can cause file system issues or loss.

[–] [email protected] 6 points 2 months ago (1 children)

I think ecc isn't more required for zfs then for any other file system. But the idea that many people have is that if somebody goes through the trouble of using raid and using zfs then the data must be important and so ecc makes sense.

[–] [email protected] 4 points 2 months ago

ECC is slightly more required for ZFS because its ARC is generally more aggressive than the usual linux caching subsystem. That said, it's not a hard requirement. My curent NAS was converted from my old windows box (which apparently worked for years with bad ram). Zfs uncovered the problem in the first 2 days by reporting the (recoverable) data corruption in the pool. When I fixed the ram issue and hash-checked against the old backup all the data was good. So, effectively, ZFS uncovered memory corruption and remained resilient against it.

[–] [email protected] 23 points 2 months ago (1 children)

You recall wrong. ECC is recommended for any server system but not necessary.

[–] [email protected] 10 points 2 months ago (1 children)

And if you dont have ECC zfs just might save your bacon when a more basic fs would allow corruption

[–] [email protected] 2 points 2 months ago* (last edited 2 months ago)

It might also save it from shit controllers and cables which ECC can't help with. (It has for me)