How to turn a mirror in to a RAIDZ
I wanted to add storage on my pool, but I should have added two drivers if I would have continued with mirrored pool. So here is a guide on how to transform zfs mirror pool to raidz with one additional drive.
Commands:
zpool status
zpool detach bigpool sdb1
zpool remove bigpool nvme1n1p1
zpool remove bigpool nvme1n1p3
dd if=/dev/zero of=/media/disk.img seek=7814026583 bs=1024 count=1
mounting loopback
losetup -f
losetup /dev/loop0 /media/disk.img
create raidz
zpool create bigz raidz sdb1 sdd1 loop0
remove lookback
losetup -d /dev/loop0 && rm /media/disk.img
zfs create bigz/newz
rsync -ah --progress
zpool destroy bigpool
zpool replace bigz loop0 sda1
zpool add bigz log nvme1n1p1
zpool add bigz cache nvme1n1p3
zfs set mountpoint
