Re: why the kernel and mdadm report differently

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Farkas Levente wrote:
and one more stange thing that it's currently not working, kernel report inactive while mdadm said it's active, degraded. what's more we cant put this array into active state.



Looks like you need to stop in (mdadm -S /dev/md2) and re-assemble it
with --force:
  mdadm -A /dev/md2 -f /dev/sd[abcefgh]1

It looks like the computer crashed and when it came back up it was
missing a drive.  This situation can result in silent data corruption,
which is why md won't automatically assemble it.  When you do assemble
it, you should at least fsck the filesystem, and possibly check for
data corruption if that is possible.  At least be aware that some data
could be corrupt (there is a good chance that nothing is, but it is by
no means certain).


it works. but shouldn't it have to be both inactive or active?

or seems to works, but now do nothing?!:
--------------------------------------------------------
[root@kek:~] cat /proc/mdstat
Personalities : [raid1] [raid5]
md1 : active raid1 hdc1[0] hda1[1]
      1048704 blocks [2/2] [UU]

md2 : active raid5 sdc1[7] sda1[0] sdh1[8] sdg1[6] sdf1[5] sde1[4] sdb1[1]
      720321792 blocks level 5, 128k chunk, algorithm 2 [7/5] [UU__UUU]

md0 : active raid1 hdc2[0] hda2[1]
      39097664 blocks [2/2] [UU]

unused devices: <none>
[root@kek:~] mdadm --detail /dev/md2
/dev/md2:
        Version : 00.90.01
  Creation Time : Tue Jun  1 09:37:17 2004
     Raid Level : raid5
     Array Size : 720321792 (686.95 GiB 737.61 GB)
    Device Size : 120053632 (114.49 GiB 122.93 GB)
   Raid Devices : 7
  Total Devices : 7
Preferred Minor : 2
    Persistence : Superblock is persistent

    Update Time : Mon Sep  5 15:28:20 2005
          State : clean, degraded
 Active Devices : 5
Working Devices : 7
 Failed Devices : 0
  Spare Devices : 2

         Layout : left-symmetric
     Chunk Size : 128K

           UUID : 79b566fd:924d9c94:15304031:0c945006
         Events : 0.4244279

    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
       3       0        0        -      removed
       4       8       65        4      active sync   /dev/sde1
       5       8       81        5      active sync   /dev/sdf1
       6       8       97        6      active sync   /dev/sdg1

       7       8       33        2      spare rebuilding   /dev/sdc1
       8       8      113        3      spare rebuilding   /dev/sdh1
--------------------------------------------------------


--
  Levente                               "Si vis pacem para bellum!"

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