Topic: raid configuration

[magwm]

Hello, there I am again to inquire about my raid configuration..

for some reaso, my raid thinks there should be 3 disks, while there are only two.

This is a production server, I would hate to break it, and at the moment it performs perfectly.. The raid once or twice found an error on one of the two disks, and repaired it without hiccups. but every time I reboot it gives the degradedarray error message..

can anyone give me a hint on how to proceed? thanks a lot.

Code: [Select]

here are the details:

[root@www ~]# mdadm --examine /dev/sda1
/dev/sda1:
          Magic : a92b4efc
        Version : 00.90.00
           UUID : 123f3a9c:9ade4333:c858deb7:b1aea4be
  Creation Time : Tue May  8 19:03:09 2007
     Raid Level : raid1
   Raid Devices : 3
  Total Devices : 2
Preferred Minor : 1

    Update Time : Tue Oct 21 10:53:47 2008
          State : clean
 Active Devices : 2
Working Devices : 2
 Failed Devices : 0
  Spare Devices : 0
       Checksum : 5f904e68 - correct
         Events : 0.4101


      Number   Major   Minor   RaidDevice State
this     1       8        1        1      active sync   /dev/sda1

   0     0       0        0        0      removed
   1     1       8        1        1      active sync   /dev/sda1
   2     2       8       17        2      active sync   /dev/sdb1

[root@www ~]# mdadm --examine /dev/sda2
/dev/sda2:
          Magic : a92b4efc
        Version : 00.90.00
           UUID : 94b5168f:f65fe5e2:8f34cf7d:7724b91b
  Creation Time : Tue May  8 19:03:09 2007
     Raid Level : raid1
   Raid Devices : 3
  Total Devices : 2
Preferred Minor : 2

    Update Time : Tue Oct 21 11:00:11 2008
          State : clean
 Active Devices : 2
Working Devices : 2
 Failed Devices : 1
  Spare Devices : 0
       Checksum : ccc260bd - correct
         Events : 0.15545707


      Number   Major   Minor   RaidDevice State
this     0       8        2        0      active sync   /dev/sda2

   0     0       8        2        0      active sync   /dev/sda2
   1     1       8       18        1      active sync   /dev/sdb2
   2     2       0        0        2      faulty removed


[root@www ~]# mdadm --detail --verbose /dev/md1
/dev/md1:
        Version : 00.90.01
  Creation Time : Tue May  8 19:03:09 2007
     Raid Level : raid1
     Array Size : 104320 (101.89 MiB 106.82 MB)
    Device Size : 104320 (101.89 MiB 106.82 MB)
   Raid Devices : 3
  Total Devices : 2
Preferred Minor : 1
    Persistence : Superblock is persistent

    Update Time : Tue Oct 21 10:53:47 2008
          State : clean, degraded
 Active Devices : 2
Working Devices : 2
 Failed Devices : 0
  Spare Devices : 0

           UUID : 123f3a9c:9ade4333:c858deb7:b1aea4be
         Events : 0.4101

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

[root@www ~]# mdadm --detail --verbose /dev/md2
/dev/md2:
        Version : 00.90.01
  Creation Time : Tue May  8 19:03:09 2007
     Raid Level : raid1
     Array Size : 17816000 (16.99 GiB 18.24 GB)
    Device Size : 17816000 (16.99 GiB 18.24 GB)
   Raid Devices : 3
  Total Devices : 2
Preferred Minor : 2
    Persistence : Superblock is persistent

    Update Time : Tue Oct 21 11:02:40 2008
          State : clean, degraded
 Active Devices : 2
Working Devices : 2
 Failed Devices : 0
  Spare Devices : 0

           UUID : 94b5168f:f65fe5e2:8f34cf7d:7724b91b
         Events : 0.15545793

    Number   Major   Minor   RaidDevice State
       0       8        2        0      active sync   /dev/sda2
       1       8       18        1      active sync   /dev/sdb2
       2       0        0        -      removed



[william_syd]

What is output of

fdisk -l

and

cat /proc/mdstat

[magwm]

here they are:

Code: [Select]

[root@www html]# fdisk -l

Disk /dev/hdc: 80.0 GB, 80026361856 bytes
255 heads, 63 sectors/track, 9729 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

   Device Boot      Start         End      Blocks   Id  System
/dev/hdc1               1        9729    78148161   83  Linux

Disk /dev/sda: 18.3 GB, 18351959040 bytes
255 heads, 63 sectors/track, 2231 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

   Device Boot      Start         End      Blocks   Id  System
/dev/sda1   *           1          13      104391   fd  Linux raid autodetect
/dev/sda2              14        2231    17816085   fd  Linux raid autodetect

Disk /dev/sdb: 18.3 GB, 18351959040 bytes
255 heads, 63 sectors/track, 2231 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

   Device Boot      Start         End      Blocks   Id  System
/dev/sdb1   *           1          13      104391   fd  Linux raid autodetect
/dev/sdb2              14        2231    17816085   fd  Linux raid autodetect

Disk /dev/md1: 106 MB, 106823680 bytes
2 heads, 4 sectors/track, 26080 cylinders
Units = cylinders of 8 * 512 = 4096 bytes

Disk /dev/md1 doesn't contain a valid partition table

Disk /dev/md2: 18.2 GB, 18243584000 bytes
2 heads, 4 sectors/track, 4454000 cylinders
Units = cylinders of 8 * 512 = 4096 bytes

Disk /dev/md2 doesn't contain a valid partition table

Disk /dev/dm-0: 16.0 GB, 16072572928 bytes
2 heads, 4 sectors/track, 3923968 cylinders
Units = cylinders of 8 * 512 = 4096 bytes

Disk /dev/dm-0 doesn't contain a valid partition table

Disk /dev/dm-1: 2080 MB, 2080374784 bytes
2 heads, 4 sectors/track, 507904 cylinders
Units = cylinders of 8 * 512 = 4096 bytes

Disk /dev/dm-1 doesn't contain a valid partition table


Code: [Select]

[root@www html]# cat /proc/mdstat
Personalities : [raid1]
md2 : active raid1 sda2[0] sdb2[1]
      17816000 blocks [3/2] [UU_]

md1 : active raid1 sda1[1] sdb1[2]
      104320 blocks [3/2] [_UU]

unused devices: <none>