Question

7

Do I have to worry about "error: superfluous RAID member"?

rated 0 times [ 7] [ 0] / answers: 1 / hits: 5433 / 2 Years ago, tue, december 28, 2021, 11:54:18

When running update-grub on the newly installed Ubuntu 12.04 with an older software RAID (md), I get:

error: superfluous RAID member (5 found).

error: superfluous RAID member (5 found).

Generating grub.cfg ...

error: superfluous RAID member (5 found).

error: superfluous RAID member (5 found).

error: superfluous RAID member (5 found).

error: superfluous RAID member (5 found).

error: superfluous RAID member (5 found).

error: superfluous RAID member (5 found).

error: superfluous RAID member (5 found).

error: superfluous RAID member (5 found).

error: superfluous RAID member (5 found).

error: superfluous RAID member (5 found).

error: superfluous RAID member (5 found).

Found linux image: /boot/vmlinuz-3.2.0-24-generic

Found initrd image: /boot/initrd.img-3.2.0-24-generic

error: superfluous RAID member (5 found).

error: superfluous RAID member (5 found).

error: superfluous RAID member (5 found).

error: superfluous RAID member (5 found).

Found linux image: /boot/vmlinuz-3.2.0-23-generic

Found initrd image: /boot/initrd.img-3.2.0-23-generic

error: superfluous RAID member (5 found).

error: superfluous RAID member (5 found).

error: superfluous RAID member (5 found).

error: superfluous RAID member (5 found).

error: superfluous RAID member (5 found).

Found memtest86+ image: /boot/memtest86+.bin

error: superfluous RAID member (5 found).

error: superfluous RAID member (5 found).

error: superfluous RAID member (5 found).

error: superfluous RAID member (5 found).

error: superfluous RAID member (5 found).

Found Debian GNU/Linux (5.0.9) on /dev/sdb1

Found Debian GNU/Linux (5.0.9) on /dev/sdc1

done

I would be less worried if the message would say warning: ..., but since it says error: ... I'm wondering what the problem is.

# cat /proc/mdstat

Personalities : [linear] [multipath] [raid0] [raid1] [raid6] [raid5] [raid4] [raid10]

md2 : active raid1 sdc1[1] sdb1[0]

      48829440 blocks [2/2] [UU]



md3 : active raid1 sdc2[1] sdb2[0]

      263739008 blocks [2/2] [UU]



md1 : active raid5 sdg1[3] sdf1[2] sde1[1] sdh1[0] sdi1[4] sdd1[5](S)

      1250274304 blocks level 5, 64k chunk, algorithm 2 [5/5] [UUUUU]



unused devices: <none>

Do I have to worry or is this harmless?

btw: disregard the mentioning of Debian 5.0.9, that was the previously installed system and is going to be overwritten. It's on /dev/md2 actually.

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1 Year ago

answered 2 Years ago sweetrifiabl · Accepted Answer

As mentioned here by Fussy Salsify this seems to be a bug of update-grub script with spare device in one of the RAID arrays. As mentioned here a patch has been applied and should come to Ubuntu at some time.

Boyd Stephen Smith Jr. said he thinks this error report may be just cosmetic here and Vladimir 'φ-coder/phcoder' Serbinenko submitted a patch that seems to just change the error report to "spares aren't implemented".

Also there is a bug report at launchpad (#816475) and a possible workaround that involves changing the partitioning. The importance of this bug is undecided at launchpad but looks like it caused some real problem to Björn Tillenius that could not upgrade/install grub. So looks like you should be careful.