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[SOLVED] Gentoo mdadm --detail vs. /proc/mdstat
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Vieri
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Joined: 18 Dec 2005
Posts: 546

PostPosted: Mon Feb 17, 2014 5:50 pm    Post subject: [SOLVED] Gentoo mdadm --detail vs. /proc/mdstat Reply with quote

Hi,

I'm puzzled as to why my /proc/mdstat states that I have 3 RAID1 sets with 2 disks and 3 different partitions while mdadm --detail gives me a whole different result.

Code:

livecd ~ # cat /proc/mdstat
Personalities : [raid0] [raid1] [raid6] [raid5] [raid4] [raid10] [linear] [multipath]
md4 : active raid1 sdb4[1] sda4[0]
      38337408 blocks [2/2] [UU]

md2 : active raid1 sdb2[1] sda2[0]
      131008 blocks [2/2] [UU]

md1 : active raid1 sdb1[1] sda1[0]
      1984 blocks [2/2] [UU]

unused devices: <none>
livecd ~ # mdadm --detail /dev/md1
/dev/md1:
        Version : 0.90
  Creation Time : Mon Feb 17 17:58:10 2014
     Raid Level : raid1
     Array Size : 1984
  Used Dev Size : 1984
   Raid Devices : 2
  Total Devices : 2
Preferred Minor : 1
    Persistence : Superblock is persistent

    Update Time : Mon Feb 17 18:30:16 2014
          State : clean
 Active Devices : 2
Working Devices : 2
 Failed Devices : 0
  Spare Devices : 0

           UUID : 67beaa32:0d1d851a:cb201669:f728008a (local to host livecd)
         Events : 0.18

    Number   Major   Minor   RaidDevice State
       0       8        1        0      active sync   /dev/sda1
       1       8       17        1      active sync   /dev/sdb1
livecd ~ # mdadm --detail /dev/md2
/dev/md2:
        Version : 0.90
  Creation Time : Mon Feb 17 17:58:10 2014
     Raid Level : raid1
     Array Size : 1984
  Used Dev Size : 1984
   Raid Devices : 2
  Total Devices : 2
Preferred Minor : 1
    Persistence : Superblock is persistent

    Update Time : Mon Feb 17 18:31:44 2014
          State : clean
 Active Devices : 2
Working Devices : 2
 Failed Devices : 0
  Spare Devices : 0

           UUID : 67beaa32:0d1d851a:cb201669:f728008a (local to host livecd)
         Events : 0.18

    Number   Major   Minor   RaidDevice State
       0       8        1        0      active sync   /dev/sda1
       1       8       17        1      active sync   /dev/sdb1
livecd ~ # mdadm --detail /dev/md4
mdadm: md device /dev/md4 does not appear to be active.
livecd ~ # ls /dev/md*
/dev/md1  /dev/md2  /dev/md3  /dev/md4  /dev/mdev.seq

/dev/md:
125  126  127
livecd ~ # mdadm --detail /dev/md/127
mdadm: cannot open /dev/md/127: No such file or directory
livecd ~ # mdadm --detail /dev/md/126
mdadm: cannot open /dev/md/126: No such file or directory
livecd ~ # mdadm --detail /dev/md/125
mdadm: cannot open /dev/md/125: No such file or directory
livecd ~ # mdadm --detail /dev/md3
mdadm: md device /dev/md3 does not appear to be active.


What's wrong here or what can I try to debug this?

Thanks,

Vieri


Last edited by Vieri on Thu Feb 20, 2014 6:58 pm; edited 1 time in total
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spike88
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Joined: 16 Oct 2012
Posts: 17

PostPosted: Mon Feb 17, 2014 10:47 pm    Post subject: Reply with quote

Did you assemble /dev/md4 like the others I do not mean to insult intelligence by asking this just needed to know
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Vieri
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Joined: 18 Dec 2005
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PostPosted: Tue Feb 18, 2014 8:19 am    Post subject: Reply with quote

Yes, exactly the same way, ie. mdadm --create --verbose /dev/md4 --name=4 --level=mirror --raid-devices=2 --metadata=0.90 /dev/sda4 /dev/sdb4

Also notice the output of mdadm --detail /dev/md2 and mdadm --detail /dev/md1... same output?! That looks odd.
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