rpool disk replacement

[pbo10]

Hi

I recently installed Proxmox using ZFS raid 1 with 2 SSD drives for the rpool and I need to replace one of them. I know there's lots of guides for replacing a disk such as this one: https://pve.proxmox.com/wiki/ZFS:_Tips_and_Tricks

But I understood there was a change in the recent updates to the bootloader (is grub even used now?), so can someone let me know if that information is still valid or is there now a different way that boot drives should be replaced when set up as mirrored ZFS drives?

Thanks

 

[t.lamprecht]

If recently is after 5.4 then yes, if the system was booted into EFI mode there's something a bit different. First, with RAID1 both disks have a bootloader installed, so even if one fails you are not in immediate danger. And if you did not boot with EFI everything is as before.

For replacing a ZFS created by our installer since PVE 5.4 you can take look at:
https://pve.proxmox.com/pve-docs/chapter-sysadmin.html#_zfs_administration (end of that section, "Changing a failed bootable device when using systemd-boot")
and https://pve.proxmox.com/pve-docs/chapter-sysadmin.html#sysboot_systemd_boot_setup

 

[pbo10]

Thanks for the quick reply, so I've read through but still not 100% on this and I don't want to get it wrong.

The disk is offline and I've done the first 2 parts to copy the partition table and randomise the GUID:
sgdisk /dev/sdb -R /dev/sdc
sgdisk -G /dev/sdc

This is the rpool is it's current form:

        NAME                                                   STATE     READ WRITE CKSUM
        rpool                                                  DEGRADED     0     0     0
          mirror-0                                             DEGRADED     0     0     0
            ata-SQF-S25M8-512G-SAC_FF1A07931AB607013328-part3  ONLINE       0     0     0
            17086470446843778281                               OFFLINE      0     0     0  was /dev/disk/by-id/ata-SQF-S25M8-512G-SAC_DC11078C16EC06101361-part3

So to replace the disk should I now be using a disk GUID rather than /dev/sdc?

zpool replace -f rpool 17086470446843778281 <new zfs partition>

I'm not sure exactly how I get the correct GUID to use as <new zfs partition> for the replacement disk?

 

[pbo10]

Not to worry, I found out I can see all the disk GUIDs with a simple ls -l /dev/disk/by-id/.

One issue I did find though is that because I was replacing the disk with the same disk, I had to remove it to another system and use zpool labelclear -f /dev/sdX3 before I was able to use the disk again. I couldn't find a way to clear the disk while still in the Proxmox system.

 

[jim.bond.9862]

Hate to resurect an old thread, but is there a help on how to do the very same thing on system prior to 5.4?

I am running 5.3 and not updating because last update from 5.1 to 5.3 housed the install and I had to redo everything from scratch as I simply could not recover the VMs.

I folowed several how-to step by step.
The disks look identical yet I can boot from first but not from second.