Storage: BTRFS vs ZFS vs plain EXT4 DM raid

[Krakish]

Hi all,

Currently I am running on PVE 9.1 with native MDADM RAID5(3x8 TB disks) looking into prospects for switching to BTRFS or ZFS but every now and then power goes out.
At the moment I got 4 TB used out of ~ 16 TB and despite some issues it works awesome.
Anyone got experience with ZFS and BTRFS with once a month power outages ?
With ZFS data should be safer but I will need to wipe all 3 disks at the same time
With BTRFS I can copy data on 1 disk, wipe other 2 and expand first disk and "btrfs balance" from raid 0 to raid 5 however raid 5 is prone to issues during power outages.
Phoronix also doesn't make the choice easier with this one https://www.phoronix.com/news/Linux-6.17-EXT4

Looks like running EXT4 on DM raid is looking good for my 'buthcer' setup

 

[alma21]

Hi,

- I wouldn't use btrfs for your setup - btrfs raid5 is still not stable/production ready and afaik btrfs is tech preview in Proxmox VE
- mdadm is not supported in Proxmox VE - but if this is not a main concern for you and it's working - I would keep it
- so the supported options are:
ZFS .... ZRAID - but better to use zfs mirror(s) for performance (if a RAID controller needs to be used then in passthrough / IT mode ... ZFS needs direct access to the disks)
HW RAID controller + LVM (thin)
HW RAID controller + LVM (thick) + ext4/xfs + qcow2 (for thin provisioning & snapshots)