Neil Brown írta:

(reads code).

Ahhh. You are using version-1 superblocks aren't you?  That code only
works for version-0.90 superblocks.  That was careless of me.  It
shouldn't be hard to make it work more generally, but it looks like it
will be slightly more than trivial.  I'll try to get you a patch in
the next day or so (feel free to remind me if I seem to have
forgotten).

Thanks for testing and reporting this problem.

NeilBrown

# mdadm26 --detail /dev/md0
/dev/md0:
         Version : 00.90.03
   Creation Time : Tue Jun 12 10:31:08 2007
      Raid Level : raid5
      Array Size : 19534848 (18.63 GiB 20.00 GB)
   Used Dev Size : 9767424 (9.31 GiB 10.00 GB)
    Raid Devices : 3
   Total Devices : 4
Preferred Minor : 0
     Persistence : Superblock is persistent

     Update Time : Tue Jun 12 10:33:35 2007
           State : clean
  Active Devices : 3
Working Devices : 4
  Failed Devices : 0
   Spare Devices : 1

          Layout : left-symmetric
      Chunk Size : 64K

            UUID : 5fd83926:01739a55:36458d87:119f8994 (local to host 
ursula)
          Events : 0.4

     Number   Major   Minor   RaidDevice State
        0       8        1        0      active sync   /dev/sda1
        1       8       17        1      active sync   /dev/sdb1
        2       8       33        2      active sync   /dev/sdc1

        3       8       49        -      spare   /dev/sdd1

/dev/md1:
         Version : 00.90.03
   Creation Time : Tue Jun 12 10:31:29 2007
      Raid Level : raid5
      Array Size : 19534848 (18.63 GiB 20.00 GB)
   Used Dev Size : 9767424 (9.31 GiB 10.00 GB)
    Raid Devices : 3
   Total Devices : 3
Preferred Minor : 1
     Persistence : Superblock is persistent

     Update Time : Tue Jun 12 10:36:18 2007
           State : clean, degraded
  Active Devices : 2
Working Devices : 2
  Failed Devices : 1
   Spare Devices : 0

          Layout : left-symmetric
      Chunk Size : 64K

            UUID : 815d6fc4:a55c2602:36458d87:119f8994 (local to host 
ursula)
          Events : 0.6

     Number   Major   Minor   RaidDevice State
        0       8       65        0      active sync   /dev/sde1
        1       8       81        1      active sync   /dev/sdf1
        2       0        0        2      removed

        3       8       97        -      faulty spare   /dev/sdg1

ARRAY /dev/md1 level=raid5 num-devices=3 spare-group=ubul 
UUID=815d6fc4:a55c2602:36458d87:119f8994
ARRAY /dev/md0 level=raid5 num-devices=3 spares=1 spare-group=ubul 
UUID=5fd83926:01739a55:36458d87:119f8994

I am very sorry, but it wont works with .9 superblocks also :( We 
missing something small, but important here. Before you start to code. 
mdadm was running in monitor mode, and reported a Fail. mdadm is the 
latest version, 2.6.2.

tg
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