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l : 11 April 2008 • 8:28PM -0400

Need some information and help on mdadm in order to support it on IBM z Systems
by Jean-Baptiste Joret



I am trying to obtain information such as design document or anything that
would describe the content of the metadata. I am evaluating the solution
to determinate whether it is entreprise ready for use as a mirror solution
and if we can support it at IBM.

Also I am currently having quite a show stopper issue, where help would be
appreciated. I have a RAID1 with 2 Harddisks, when I remove one hardisk (I
put the chpids offline which is equivalent to telling the system that the
drive is currently not available), the missing disk is marked as "faulty
spare" when calling mdadm -D /dev/md0.

        Version : 01.02.03
  Creation Time : Fri Apr 11 11:11:59 2008
     Raid Level : raid1
     Array Size : 2403972 (2.29 GiB 2.46 GB)
  Used Dev Size : 2403972 (2.29 GiB 2.46 GB)
   Raid Devices : 2
  Total Devices : 2
Preferred Minor : 0
    Persistence : Superblock is persistent

  Intent Bitmap : Internal

    Update Time : Fri Apr 11 11:23:04 2008
          State : active, degraded
Active Devices : 1
Working Devices : 1
Failed Devices : 1
  Spare Devices : 0

           Name : 0
           UUID : 9a0a6e30:4b8bbe7f:bc0cad81:9fd46804
         Events : 8

    Number   Major   Minor   RaidDevice State
       0       0        0        0      removed
       1      94       21        1      active sync   /dev/dasdf1

       0      94       17        -      faulty spare   /dev/dasde1

When I put the disk back online it is not automatically reinserted into
the array. The only thing that I have tried that worked was to do a hot
remove followed by a hot add (mdadm /dev/md0 -r /dev/dasde1 and then mdadm
/dev/md0 -a /dev/dasde1). Is that the correct way or is there any option
to tell the disk is back an clean ? I don't like my solution verymuch as
somtimes I get an error saying the superblock cannot be written.

Thank you very much for any help you can provide.

Best regards / Mit freundlichen Gruessen / Cordialement / Cordiali Saluti

Jean-Baptiste Joret - Linux on System Z
Phone: +49 7031 16-3278 / ITN: 39203278 - eMail: joret@de.i...

IBM Deutschland Research & Development GmbH
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