Single drive zpool upgrade to mirror, upgrade to striped mirror

[zidarko]

Hi,

My NAS is currently running with 4x 4 TB hard drives on Linux using RAIDZ-1, which was good when I set it up years ago but it makes upgrades problematic. Long story short, one of the hard drives is failing (ZFS reported the errors first, followed by SMART). I would now like to upgrade to TrueNAS and upgrade/convert my zpool to striped mirror (RAID-10). I have already received a pair of 6 TB drives I want to use for this.

My plan of action is as follows:
1. Kick the faulty drive out of zpool_old and erase it. Check warranty and send it for replacement if possible.
2. Install True NAS and import zpool_old with the missing drive.
3. Insert new 6 TB drive, create zpool_new. Copy essential data from zpool_old to zpool_new.
4. Delete zpool_old.
5. Insert second 6 TB drive and add it to zpool_new. Wait for resilvering to complete.
6. Add the remaining pair of 4 TB drives as a mirrored vdev zpool_new. Wait for resilvering to complete.

The end configuration of zpool_new is thus: 2x 6 TB (mirror) and 2x 4 TB (mirror) with a total capacity of ~10 TB.

I've used a similar procedure on Linux but I don't know whether True NAS can do it. Can someone confirm/deny this?

Thanks!

 

[Kris Moore]

You may have some issues attaching a smaller vdev mirror to a larger one, but you can force it at the CLI if you are certain its what you want to do.

However apart from that, the process sounds correct.

 

[zidarko]

Hi.

Thanks for checking my procedure.

I do want to have this setup because I would like to upgrade all my hard disks and a the setup I'm suggesting allows to do it more readily than the current RAIDZ-1.