Raid

English Hardware
1

Hi,

One of the nodes has a back-up storage connected. it has 8 raid devices. but it shows 1 is removed. How do I find which one is removed?

si64:/dev # mdadm --detail /dev/md3
/dev/md3:
        Version : 01.00.03
  Creation Time : Sun Oct 23 16:04:53 2011
     Raid Level : raid5
     Array Size : 6837318656 (6520.58 GiB 7001.41 GB)
  Used Dev Size : 1953519616 (1863.02 GiB 2000.40 GB)
   Raid Devices : 8
  Total Devices : 7
Preferred Minor : 3
    Persistence : Superblock is persistent

  Intent Bitmap : Internal

    Update Time : Tue Mar 20 16:46:15 2012
          State : active, degraded
 Active Devices : 7
Working Devices : 7
 Failed Devices : 0
  Spare Devices : 0

         Layout : left-symmetric
     Chunk Size : 128K

           Name : 3
           UUID : ff736409:5b1a6101:0f1f75c0:529a4f95
         Events : 71084

    Number   Major   Minor   RaidDevice State
       0       8       33        0      active sync   /dev/sdc1
       1       8       49        1      active sync   /dev/sdd1
       2       8       65        2      active sync   /dev/sde1
       3       8       81        3      active sync   /dev/sdf1
       4       8       97        4      active sync   /dev/sdg1
       5       8      113        5      active sync   /dev/sdh1
       6       8      129        6      active sync   /dev/sdi1
       7       0        0        7      removed
si64:/dev #

Thank You,
Raj

2

Nice jumping in the middle of the problem. Not even telling what level of openSUSE you use.

And I would say that the missing one is the one not mentioned in the list. I assume you have at least some basic administration about how the whole thing is build. You can also look at the LEDs of the disks. Which one is not flickering at all.

An

fdisk -l

output may help.
But when the disk has stopped functioning and you rebooted, the names could have changed from before and would allways be sda … sdi, irecpective if e.g. the original sde fell out.
Also looking at /dev/disk/by-id will show you which make/type/id every disk has and thus show which one is missing. That is when you have any administration (as a system manager should have).