HELP !! Recovering ZFS disk header after running sgdisk -Z on one RAIDZ disk
Hi everyone,
I have a ZFS RAIDZ (3 disks) setup that was created using whole disks (no partitions).
Unfortunately, I accidentally ran the following command on one of the member disks:
sgdisk -Z /dev/sdb
This wiped the partition table and GPT headers.
Now ZFS doesn’t recognize the disk as part of the pool anymore.
Here’s the situation:
Pool type: RAIDZ (3 disks)
Disks used: /dev/sda, /dev/sdb, /dev/sdc
Accidentally wiped: /dev/sdb
The other two disks are intact and still part of the pool
zpool import -f -R /mnt/test rpool
cannot import ‘rpool’: one or more devices is currently unavailable
My questions:
Is it possible to restore the ZFS disk header (or partition table) from the backup GPT?
If ZFS was using the entire raw disk (no partitions), can I just re-add or replace the disk without data loss?
What’s the safest way to check or repair without destroying the existing pool metadata?
Any suggestions or example commands (like zpool import -f, sgdisk --replicate, etc.) would be really appreciated.
Thanks in advance!