On 23/11/2020 16:49, Frank Bures wrote:
On 11/23/20 10:46 AM, Simon Matter wrote:
Hi,
I want to replace my hard drives based SW RAID-1 with SSD's.
What would be the recommended procedure? Can I just remove one drive,
replace with SSD and rebuild, then repeat with the other drive?
I suggest to "mdadm --fail" one drive, then "mdadm --remove" it. After
replacing the drive you can "mdadm --add" it.
If you boot from the drives you also have to care for the boot loader. I
guess this depends on how exactly the system is configured.
If you can the new disks while the original 2 disks are still available
then grow, add, wait, fail, remove, shrink. That way you will never
loose redundancy...
# grow and add new disk
mdadm --grow -n 3 /dev/mdX -a /dev/...
# wait for rebuild of the array
mdadm --wait /dev/mdX
# fail old disk
mdadm --fail /dev/sdY
# remove old disk
mdadm /dev/mdX --remove /dev/sdY
# add second disk
mdadm /dev/mdX --add /dev/...
# wait
mdadm --wait /dev/mdX
# fail and remove old disk
mdadm --fail /dev/sdZ
mdadm /dev/mdX --remove /dev/sdZ
# shrink
mdadm --grow -n 2 /dev/mdX
peter
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