How to create zfs mirror with default installation?

[ozgurerdogan]

I want to create mirror zfs pool. I installed pve as zfs file system and tried:

zpool create STORAGE mirror /rpool/data /dev/sdb
cannot use '/rpool/data': must be a block device or regular file

Or

root@ns302028:~# zpool add rpool mirror /rpool/data /dev/sdb
cannot use '/rpool/data': must be a block device or regular file

So It does not allow. Must I go with non-zfs root install and create mirror pool by then?

 

[tom]

You installed on a single drive with ZFS and want to mirror now?

 

[ozgurerdogan]

I have second disk on it.
I think command is :
zpool attach rpool /dev/sda2 /dev/sdb

But is this correct way? Is this going to mirror all system ?

 

[mbaldini]

Yes, zpool attach can convert your single disk pool into a raid-1 pool.

 

[ozgurerdogan]

Yes. How do i replace rpool disk?

 

[mbaldini]

Replace what?
Post output of

zpool status

If it's a single drive pool, you can convert it in a raid-1 mirror with zpool attach <actual drive> <new drive>

 

[killmasta93]

if you want to create another pool for another ZFS RAID this example is for raid 10

zpool create -f -o ashift=12 vmdata mirror /dev/sdc /dev/sdd mirror /dev/sde /dev/sdf

then you would import with

zpool import vmdata

if you want to replace a failed disk
pull out the bad disk then put in the new one run this command to find out which disk

lsblk

then once you found your disk you replicate from the virgin disk to the zfs disk meaning that the new disk will get the partitions of other mirror

sgdisk --replicate=/dev/sdb /dev/sda

then randomize the guids

sgdisk --randomize-guids /dev/sdb

and if its the OS proxmox you need to install grub if not then ignore this part

grub-install /dev/sdb

and finally replace

zpool replace rpool /dev/sdb2

wait to resilver then reboot

 

[elurex]

above method confirmed works.

 

[ozgurerdogan]

I am testing to replace rpool with an os reinstall. I install pve with zfs root install. And create mirror with second this with command:

zpool attach rpool /dev/sda2 /dev/sdb

And added some files then reinstall pve. Now I want to import/recreate same mirror. So when I zpool status, I see:

pool: rpool
 state: ONLINE
status: Some supported features are not enabled on the pool. The pool can
        still be used, but some features are unavailable.
action: Enable all features using 'zpool upgrade'. Once this is done,
        the pool may no longer be accessible by software that does not support
        the features. See zpool-features(5) for details.
  scan: none requested
config:

        NAME        STATE     READ WRITE CKSUM
        rpool       ONLINE       0     0     0
          sda2      ONLINE       0     0     0

errors: No known data errors

  pool: rpool-13701826336599050226
 state: DEGRADED
status: One or more devices could not be used because the label is missing or
        invalid.  Sufficient replicas exist for the pool to continue
        functioning in a degraded state.
action: Replace the device using 'zpool replace'.
   see: http://zfsonlinux.org/msg/ZFS-8000-4J
  scan: resilvered 1.04G in 0h0m with 0 errors on Sun Dec  3 18:04:16 2017
config:

        NAME                     STATE     READ WRITE CKSUM
        rpool-13701826336599050226  DEGRADED     0     0     0
          mirror-0               DEGRADED     0     0     0
            7084915294388246136  FAULTED      0     0     0  was /dev/sda2
            sdb                  ONLINE       0     0     0

errors: No known data errors

So now how should I attach sda2 again with mirroring to sdb ?