How to get an inactive RAID device working again?
- by Jonik
After booting, my RAID1 device (/dev/md_d0 *) sometimes goes in some funny state and I cannot mount it.
* Originally I created /dev/md0 but it has somehow changed itself into /dev/md_d0.
# mount /opt
mount: wrong fs type, bad option, bad superblock on /dev/md_d0,
missing codepage or helper program, or other error
(could this be the IDE device where you in fact use
ide-scsi so that sr0 or sda or so is needed?)
In some cases useful info is found in syslog - try
dmesg | tail or so
The RAID device appears to be inactive somehow:
# cat /proc/mdstat
Personalities : [linear] [multipath] [raid0] [raid1] [raid6] [raid5]
[raid4] [raid10]
md_d0 : inactive sda4[0](S)
241095104 blocks
# mdadm --detail /dev/md_d0
mdadm: md device /dev/md_d0 does not appear to be active.
Question is, how to make active the device again (using mdmadm, I presume)?
(Other times it's alright (active) after boot, and I can mount it manually without problems. But it still won't mount automatically even though I have it in /etc/fstab:
/dev/md_d0 /opt ext4 defaults 0 0
So a bonus question: what should I do to make the RAID device automatically mount at /opt at boot time?)
This is an Ubuntu 9.10 workstation. Background info about my RAID setup in this question.
