Re: ZFS replace a mirrored disk

On Wed, May 11, 2022 at 01:22:36PM +0300, Christos Chatzaras wrote:

Hello,

> When a disk fails and want to replace it with a NEW disk are these commands correct?
> 
> ----
> gpart backup nvd1 | gpart restore -F nvd0
> gmirror forget swap
> gmirror insert swap /dev/nvd0p2
> gpart bootcode -b /boot/pmbr -p /boot/gptzfsboot -i 1 nvd0
> zpool replace zroot nvd0
> ----
> 
> 
> I try to simulate a disk "failure". I tried the above commands with the SAME disk without success. I believe the "issue" is because the "new" disk is the SAME as before.

First please define "without success", what doesn't work?

please paste output of:

$> gpart show nvd1

also, is it an UEFI system or classicla BIOS with GPT? What FreeBSD
version?

zpool replace zroot nvd0 is invalid, you should use:

$> zpool replace zroot nvd1 nvd0 (but it uses the entire disk, which is
probably incorrect too)

> 
> I did these steps:
> 
> 1) Boot with mfsBSD and did "gpart destroy -F nvd0"
> 2) Reboot the server in the main OS.
> 
> If the "new" disk is the SAME as before do I have to change the commands to these?
> 
> ----
> gpart backup nvd1 | gpart restore -F nvd0
> gmirror forget swap
> gpart bootcode -b /boot/pmbr -p /boot/gptzfsboot -i 1 nvd0
> zpool offline zroot nvd0
> zpool online zroot nvd0
> ----
> 
> 
> Also I notice that with the SAME disk "gmirror forget swap" starts rebuilding swap immediately and "gmirror insert swap /dev/nvd0p2" is not needed. Is this the correct behaviour when the "new" disk is the SAME?

-- 
Julien Cigar
PGP fingerprint: EEF9 F697 4B68 D275 7B11  6A25 B2BB 3710 A204 23C0
No trees were killed in the creation of this message.
However, many electrons were terribly inconvenienced.