On 24. 12. 21 19:22, Doug Herr wrote:
On Fri, Dec 24, 2021, at 6:38 AM, cen wrote:
I recently had to replace a bad disk in raid1 array and finding proper
docs was not a good experience.
Looking at my notes, I can add some of my notes. These may or may not apply to
you...
(Should not be needed since you are not changing the UUID of the Raid)
Add any missing raid UUIDs to /etc/default/grub, there should be a
"rd.md.uuid=UUID" for each one of your RAID (not partition)
UUIDs. Rerun grub2-mkconfig to update your grub.cfg.
(Should not be needed since you are not changing the UUID of the Raid)
Remember to check /etc/mdadm.conf, just in case.
The above is mostly a reminder to review all raid related stuff after any such
change.
If you happen to use a mix of ssd and rotating rust then remember this bit:
Enable it if you add an SSD for sda:
echo writemostly > /sys/block/md1/md/dev-sdb1/state
echo writemostly > /sys/block/md1/md/dev-sdc1/state
Make 100% sure that then new disk has at least as many sectors (I think it is
the sectors) as the old drive. If not then something needs to be shrunk down a
bit to allow that `sfdisk` copy to work properly. That is why it is best to
leave some unused space when first building these.
Not 100% sure that the "grow" is correct there since you are not changing the size but it
will let you know one way or the other. My notes have "mdadm --manage /dev/md127 --add
/dev/sdd1"
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Good point about the grow flag, since I am not actually growing the size
of the partition it is unnecessary. Mdadm did not complain so I guess it
can handle it.
Also good info on ssd, I am actually planning to do this one day. The
spinning disks are 10 year old at this point so the next time one dies I
will add an SSD to the mirror and remove all the rust. It is an easier
procedure than cloning the disk or a clean install.
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