Re: Help in need: mdadm and software RAID5 recovery on FC4

On Fri, 25 Aug 2006, Robinson Tiemuqinke wrote:

Hi,

I still have several Fedora Core 4 boxes running with
software RAID5 created with mdadm tool.

Now one underlying component disk failed and have to
be replaced. But I have to save the data on the
software RAID5 device.

Any one can show me the correct "official way" to do
this job? Thanks a lot.

Detailed background: the RAID5 was created with the
following command:

" mdadm --create /dev/md0 --level=5 --raid-devices=3
/dev/sd[bcd]1 "

and now the sdb1 failed and I will replace it soon.

 Please help.

--Robinson

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Like so:


p500b1:~# mdadm -D /dev/md0
/dev/md0:
        Version : 00.90.03
  Creation Time : Sat May 27 15:38:10 2006
     Raid Level : raid5
     Array Size : 4417280 (4.21 GiB 4.52 GB)
    Device Size : 2208640 (2.11 GiB 2.26 GB)
   Raid Devices : 3
  Total Devices : 2
Preferred Minor : 0
    Persistence : Superblock is persistent

    Update Time : Sat May 27 16:20:54 2006
          State : clean, degraded
 Active Devices : 2
Working Devices : 2
 Failed Devices : 0
  Spare Devices : 0

         Layout : left-symmetric
     Chunk Size : 64K

           UUID : a6a0f4cc:4311f7d2:739fc939:64a49b1c
         Events : 0.853

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

------

p500b1:~# mdadm /dev/md0 -a /dev/sdc1
mdadm: hot added /dev/sdc1
p500b1:~#


p500b1:~# mdadm -D /dev/md0 |grep Rebuild
 Rebuild Status : 4% complete
p500b1:~#

p500b1:~# cat /proc/mdstat
Personalities : [linear] [raid0] [raid1] [raid10] [raid5] [raid4] [raid6]
md0 : active raid5 sdc1[3] sdb1[1] sda1[0]
      4417280 blocks level 5, 64k chunk, algorithm 2 [3/2] [UU_]

unused devices: <none>
p500b1:~#

---------

recovery complete

p500b1:~# mdadm -D /dev/md0
/dev/md0:
        Version : 00.90.03
  Creation Time : Sat May 27 15:38:10 2006
     Raid Level : raid5
     Array Size : 4417280 (4.21 GiB 4.52 GB)
    Device Size : 2208640 (2.11 GiB 2.26 GB)
   Raid Devices : 3
  Total Devices : 3
Preferred Minor : 0
    Persistence : Superblock is persistent

    Update Time : Sat May 27 16:33:51 2006
          State : clean
 Active Devices : 3
Working Devices : 3
 Failed Devices : 0
  Spare Devices : 0

         Layout : left-symmetric
     Chunk Size : 64K

           UUID : a6a0f4cc:4311f7d2:739fc939:64a49b1c
         Events : 0.859

    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
p500b1:~#