Re: Help RAID5 reshape Oops / backup-file

[Nagilum <nagilum@xxxxxxxxxxx>]

Can someone tell me if I'm on the right track?
I've now noticed the following:
# ~/mdadm-2.6.3/mdadm -v -A /dev/md0 /dev/sd[d-e]
mdadm: looking for devices for /dev/md0
mdadm: /dev/sdd is identified as a member of /dev/md0, slot -1.
mdadm: /dev/sde is identified as a member of /dev/md0, slot -1.
mdadm: No suitable drives found for /dev/md0

This "slot -1" is also visible in the examine output:

# mdadm -E /dev/sdd
/dev/sdd:
          Magic : a92b4efc
        Version : 00.91.00
           UUID : 25da80a6:d56eb9d6:0d7656f3:2f233380
  Creation Time : Sat Sep 15 21:11:41 2007
     Raid Level : raid5
    Device Size : 488308672 (465.69 GiB 500.03 GB)
     Array Size : 1953234688 (1862.75 GiB 2000.11 GB)
   Raid Devices : 5
  Total Devices : 5
Preferred Minor : 0

  Reshape pos'n : 872095808 (831.70 GiB 893.03 GB)
  Delta Devices : 2 (3->5)

    Update Time : Mon Oct  8 23:59:27 2007
          State : clean
 Active Devices : 5
Working Devices : 5
 Failed Devices : 0
  Spare Devices : 0
       Checksum : f42505b9 - correct
         Events : 0.470134

         Layout : left-symmetric
     Chunk Size : 16K

      Number   Major   Minor   RaidDevice State
this     5       8       48       -1      spare   /dev/sdd

   0     0       8        0        0      active sync   /dev/sda
   1     1       8       16        1      active sync   /dev/sdb
   2     2       8       32        2      active sync   /dev/sdc
   3     3       8       64        3      active sync   /dev/sde
   4     4       8       48        4      active sync   /dev/sdd


So can someone confirm that is the likely source of my problem?
And hopefully - if that is indeed the problem - someone can tell me  
how to update that slot number?
Thanks,
Alex.

----- Message from nagilum@xxxxxxxxxxx ---------
    Date: Fri, 12 Oct 2007 08:43:28 +0200
    From: Nagilum <nagilum@xxxxxxxxxxx>
Reply-To: Nagilum <nagilum@xxxxxxxxxxx>
 Subject: Re: Help RAID5 reshape Oops / backup-file
      To: Neil Brown <neilb@xxxxxxx>
      Cc: linux-raid@xxxxxxxxxxxxxxx


> ----- Message from neilb@xxxxxxx ---------
>     Date: Fri, 12 Oct 2007 09:51:08 +1000
>     From: Neil Brown <neilb@xxxxxxx>
> Reply-To: Neil Brown <neilb@xxxxxxx>
>  Subject: Re: Help RAID5 reshape Oops / backup-file
>       To: Nagilum <nagilum@xxxxxxxxxxx>
>       Cc: linux-raid@xxxxxxxxxxxxxxx
>
>
> > It isn't a problem that you didn't specify a backup-file.
> > If you don't, mdadm uses some spare space on one of the new drives.
> > After the critical section has passed, the backup file isn't needed
> > any longer.
> > The problem is that mdadm still wants to find and recover from it.
> >
> > I throughly tested mdadm restarting from a crash during the critical
> > section, but it looks like I didn't properly test restarting from a
> > later crash.
> >
> > I think if you just change the 'return 1' at the end of Grow_restart
> > to 'return 0' it should work for you.
> >
> > I'll try to get this fixed properly (and tested) and release a 2.6.4.
> >
> > NeilBrown
>
>
> ----- End message from neilb@xxxxxxx -----
>
> Thanks, I changed Grow_restart as suggested, now I get:
> nas:~/mdadm-2.6.3# ./mdadm -A /dev/md0 /dev/sd[a-e]
> mdadm: /dev/md0 assembled from 3 drives and 2 spares - not enough to
> start the array.
>
> nas:~/mdadm-2.6.3# cat /proc/mdstat
> Personalities : [raid6] [raid5] [raid4]
> md0 : inactive sda[0] sde[6] sdd[5] sdc[2] sdb[1]
>       2441543360 blocks
>
> unused devices: <none>
>
> which is similar to what the old mdadm is telling me.
> I'll try to find out where it gets the idea these are spares..
> Would it be a good idea to update to vanilla 2.6.23 instead of running
> Debian Etch's 2.6.18-5?
> If there is anything I can do to help with v2.6.4 let me know!
> Thanks,
> Alex.
>
> ========================================================================
> #    _  __          _ __     http://www.nagilum.org/ \n icq://69646724 #
> #   / |/ /__ ____ _(_) /_ ____ _  nagilum@xxxxxxxxxxx \n +491776461165 #
> #  /    / _ `/ _ `/ / / // /  ' \  Amiga (68k/PPC): AOS/NetBSD/Linux   #
> # /_/|_/\_,_/\_, /_/_/\_,_/_/_/_/   Mac (PPC): MacOS-X / NetBSD /Linux #
> #           /___/     x86: FreeBSD/Linux/Solaris/Win2k  ARM9: EPOC EV6 #
> ========================================================================
>
>
> ----------------------------------------------------------------
> cakebox.homeunix.net - all the machine one needs..


----- End message from nagilum@xxxxxxxxxxx -----



========================================================================
#    _  __          _ __     http://www.nagilum.org/ \n icq://69646724 #
#   / |/ /__ ____ _(_) /_ ____ _  nagilum@xxxxxxxxxxx \n +491776461165 #
#  /    / _ `/ _ `/ / / // /  ' \  Amiga (68k/PPC): AOS/NetBSD/Linux   #
# /_/|_/\_,_/\_, /_/_/\_,_/_/_/_/   Mac (PPC): MacOS-X / NetBSD /Linux #
#           /___/     x86: FreeBSD/Linux/Solaris/Win2k  ARM9: EPOC EV6 #
========================================================================


----------------------------------------------------------------
cakebox.homeunix.net - all the machine one needs..

Attachment: pgpSILtROnQD7.pgp
Description: PGP Digital Signature