I think that PVE should not use /dev/sdX when creating the RAID. It's a common practise (and suggested) to use something unique that doesn't change when moving disks (or on reboots) like /dev/disks/by-id o /dev/disks/by-path
ZFS: raid disks
- Thread starter Alessandro 123
- Start date
It has been mentioned multiple times in these forums and overall this is the recommended way. I have no idea why PVE folks still don't follow it. I changed the device naming by stopping server booting at the mount state and did a "zfs import -d /dev/disk/by-id/ poolname" where it was necessary.
Sure, but as PVE natively support ZFS, i would expect that PVE is creating a pool in a proper way.This is why I always create the pool manually
Adding support for ZFS and still create a pool in a very bad practise way is non-sense. If you support something, you should support in the proper way.
It's too easy add ZFS support just to say "we support ZFS"
Can you explain exactly step by step ? I'm new to ZFS and I don't know how to change device names after install from the live cd.
You can safely do it from initrd:
- reboot, and when grub displays the menu, press 'e' on the first line
- edit the linux line so it has break=mount at the end and then press ctrl-x
- when you get the promt, do 'modprobe zfs'
- now do a 'zpool import -d /dev/disk/by-id/ rpool'
- verify status with 'zpool status' - you should see device ids in place of the standard device names
- ctrl-d to continue booting
From now on you should see your pool based on device ids.
- reboot, and when grub displays the menu, press 'e' on the first line
- edit the linux line so it has break=mount at the end and then press ctrl-x
- when you get the promt, do 'modprobe zfs'
- now do a 'zpool import -d /dev/disk/by-id/ rpool'
- verify status with 'zpool status' - you should see device ids in place of the standard device names
- ctrl-d to continue booting
From now on you should see your pool based on device ids.
it's been on our agenda for quite a while, but unfortunately importing/creating via /dev/disk/by-id is not possible in the installer chroot. regarding the scan vs. cache services - although both are enabled by default, only one of them actually runs depending on whether a cache file exists or not (check "systemctl cat 'zfs-import-*'" for how this is done using systemd units ).
since PVE imports pools belonging to configured storages automatically anyway, you probably don't actually need either service unless you have non-rpool zpools that are not known to PVE.
).since PVE imports pools belonging to configured storages automatically anyway, you probably don't actually need either service unless you have non-rpool zpools that are not known to PVE.