On 18/12/2019 10:47, Till Wegmüller wrote:

1. Buy or Organize a new Disk with the same RPM and the same or Bigger
Capacity. If your current disk is not sold anymore then just focus on a
brand you trust with the same RPM and bigger Capacity. If the new disk
is bigger than c5d1 then any excess will simply not be addressable by
ZFS. Which is not be an issue if it is just a couple of GB. If you wish
to have two new disks as you final configuration then just grab any two
disks you like or even SSD's. The main assumption is of course that any
disk you pick fits your physical Plugs.

I thought the sector size should match else it causes a performance problem.

Harry, test with:
$ zdb -C | grep ashift

and expect either 512 or 4096; new HDDs are typically 4096. Check before we worry what to do about it.



8. Issue "zpool set autoexpand=on rpool"

9. After expansion issue "zpool set autoexpand=off rpool" and restore the default value for the future.

10. Make bootable:
# installgrub /boot/grub/stage1 /boot/grub/stage2 /dev/rdsk/$NEWDEVICE





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