Re: Posible bug on RAID 1 driver

On Wednesday February 23, jrojomartinez@mi.madritel.es wrote:

Hi,

  The Linux RAID crushes when recuntructing a disk.

...

  I use a 2.4.29 kernel (on a Debian sarge GNU/Linux).

...

unused devices: <none>
Personalities : [raid1] 
read_ahead 1024 sectors
md1 : active raid1 sdb1[2] sdd1[0] sdc1[1]
      999872 blocks [2/2] [UU]
      
unused devices: <none>
centralmad:~# DEVICE=/dev/sdc1 ; raidsetfaulty /dev/md1 $DEVICE ; raidhotremove /dev/md1 $DEVICE ; cat /proc/mdstat; 
Personalities : [raid1] 
read_ahead 1024 sectors
md1 : active raid1 sdb1[2] sdd1[0]
      999872 blocks [2/1] [U_]
      [>....................]  recovery =  0.0% (0/999872) finish=166.6min speed=0K/sec
unused devices: <none>

There is a race condition in the 2.4 kernels.  If you fail a drive and
then removing it instantly, you can hit problems.  My advice is to not
do that. (or use 2.6).

NeilBrown