[GRLUG] RAID recovery

[L. V. Lammert]

Just had a chance to try and rebuild the array, ..

# cat /proc/mdstat
Personalities : [raid6] [raid5] [raid4] [raid0] [raid1] [raid10]
md127 : inactive sdb2[2](S) sdd2[3](S)
      972580592 blocks super 1.0

md0 : active raid6 sdc2[1] sda2[0]
      972580352 blocks super 1.0 level 6, 256k chunk, algorithm 2 [4/2]
[UU__]
      bitmap: 2/4 pages [8KB], 65536KB chunk

Unfortunately, sdb2 can be neither failed nor removed:

# mdadm --manage /dev/md0 --fail /dev/sdb2
mdadm: set device faulty failed for /dev/sdb2:  No such device

# mdadm --manage /dev/md0 --remove /dev/sdb2
mdadm: hot remove failed for /dev/sdb2: No such device or address

YET, the drive appears valid:

# fdisk /dev/sdb
Welcome to fdisk (util-linux 2.21.2).

Changes will remain in memory only, until you decide to write them.
Be careful before using the write command.


Command (m for help): p

Disk /dev/sdb: 500.1 GB, 500107862016 bytes
255 heads, 63 sectors/track, 60801 cylinders, total 976773168 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x0002933a

   Device Boot      Start         End      Blocks   Id  System
/dev/sdb1            2048     4192255     2095104   82  Linux swap /
Solaris
/dev/sdb2         4192256   976773119   486290432   fd  Linux raid
autodetect

???

	Thanks!

	Lee