Ubuntu: Working RAID 1 returns “ERROR: pdc: wrong # of devices in RAID set”


I'm using Ubuntu GNOME 16.04.1 LTS 64-bits.

I have made with mdadm a RAID 1 with 2 2-TB-disks for normal storage (without any OS nor bootloader), which are /dev/sda1 and /dev/sdb1 (both with exactly the same partition size: 1.8 TB). The / partition is in /dev/sdc1 so I don't think it will affect.

Both seem to work perfectly since I have stored about 120 GB without any problem, cat /proc/mdstat still returns this:

Personalities : [raid1] [linear] [multipath] [raid0] [raid6] [raid5] [raid4] [raid10]  md127 : active raid1 sda1[0] sdb1[1]        1932603392 blocks super 1.2 [2/2] [UU]        bitmap: 0/15 pages [0KB], 65536KB chunk    unused devices: <none>  

The problem is, that every time I run update-grub, it returns these "ERRORs":

ERROR: pdc: wrong # of devices in RAID set "pdc_cjdebbggeg" [1/2] on /dev/sdb  ERROR: pdc: wrong # of devices in RAID set "pdc_cjdebbggeg" [1/2] on /dev/sdb  

I wouldn't like to lose any of my stored data, so... What should I do? Should I leave them as long they seem to work fine? Or mark /dev/sdb1 as "fail", detach, format somehow and reattach?

Thank you in advance.


It sounds like its complaining about just having the wrong number of devices in your RAID array. RAID 1 is simply mirroring a single hard drive. Can you reinstall and rearrange things so you have a single disk being mirrored to the second?

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