Migrate Raid z-1 to mirror

[rupint]

Due to lack of pcie slots available I want one of my m.2 slots back. I want to add sata ports with a m.2 to sata adapter.

Currently I have a raid z-1 pool with the 3 m.2 drives, for proxmox. Anyone know how to migrate the pool to a mirror?

To put it simply I want to give only 2 drives to proxmox instead of 3 and not lose any config, there is a lot of gpu passthrough config that I would like to avoid having to do again

Tried to lookup, but instructions are far and vague, most promising result I found was zfs send and receive commands should be used

Anyone has any experience and can help would be appreciated

 

[leesteken]

To put it simply I want to give only 2 drives to proxmox instead of 3 and not lose any config, there is a lot of gpu passthrough config that I would like to avoid having to do again

Make sure to make a backup, if you don't want to do it again (when your drives or other stuff fails or you make a mistake somewhere).

Currently I have a raid z-1 pool with the 3 m.2 drives, for proxmox. Anyone know how to migrate the pool to a mirror?

Best to use different drives but if you really want to do this in-place: detach one of the drives from the RAIDz1 (and your data is now at risk without redundancy). Create a bootable rpool (but with a different name) on that single detached drive. Copy everything over with zsend/zreceive. Reboot from the new pool and delete the old pool and attach one of the other drives to it to form a mirror. Rename the new pool to rpool.

All those steps are error prone and you could easily lose all your data. I also don't remember the details of each step (but only that it is possible) and you might need a way to boot in a Live Linux rescue USB with recent enough ZFS support (like maybe the Proxmox installer).
I would make a backup and document your current setup and reinstall Proxmox and reconfigure it and restore VM/CTs from backups.