Re: Raid5 Failure

[Tyler <pml@dtbb.net>]

If you cat /proc/mdstat, it should show the array resyncing... when its 
done, it will put the drive back as device 26.

Tyler.

David M. Strang wrote:

> Neil --
>
> That worked, the device has been added to the array. Now, I think the 
> next problem is my own ignorance.
>
> -(root@abyss)-(/)- # mdadm --detail /dev/md0
> /dev/md0:
>        Version : 01.00.01
>  Creation Time : Wed Dec 31 19:00:00 1969
>     Raid Level : raid5
>     Array Size : 1935556992 (1845.89 GiB 1982.01 GB)
>    Device Size : 71687296 (68.37 GiB 73.41 GB)
>   Raid Devices : 28
>  Total Devices : 28
> Preferred Minor : 0
>    Persistence : Superblock is persistent
>
>    Update Time : Sun Jul 17 17:32:12 2005
>          State : clean, degraded
> Active Devices : 27
> Working Devices : 28
> Failed Devices : 0
>  Spare Devices : 1
>
>         Layout : left-asymmetric
>     Chunk Size : 128K
>
>           UUID : 4e2b6b0a8e:92e91c0c:018a4bf0:9bb74d
>         Events : 176939
>
>    Number   Major   Minor   RaidDevice State
>       0       8        0        0      active sync   /dev/evms/.nodes/sda
>       1       8       16        1      active sync   /dev/evms/.nodes/sdb
>       2       8       32        2      active sync   /dev/evms/.nodes/sdc
>       3       8       48        3      active sync   /dev/evms/.nodes/sdd
>       4       8       64        4      active sync   /dev/evms/.nodes/sde
>       5       8       80        5      active sync   /dev/evms/.nodes/sdf
>       6       8       96        6      active sync   /dev/evms/.nodes/sdg
>       7       8      112        7      active sync   /dev/evms/.nodes/sdh
>       8       8      128        8      active sync   /dev/evms/.nodes/sdi
>       9       8      144        9      active sync   /dev/evms/.nodes/sdj
>      10       8      160       10      active sync   /dev/evms/.nodes/sdk
>      11       8      176       11      active sync   /dev/evms/.nodes/sdl
>      12       8      192       12      active sync   /dev/evms/.nodes/sdm
>      13       8      208       13      active sync   /dev/evms/.nodes/sdn
>      14       8      224       14      active sync   /dev/evms/.nodes/sdo
>      15       8      240       15      active sync   /dev/evms/.nodes/sdp
>      16      65        0       16      active sync   /dev/evms/.nodes/sdq
>      17      65       16       17      active sync   /dev/evms/.nodes/sdr
>      18      65       32       18      active sync   /dev/evms/.nodes/sds
>      19      65       48       19      active sync   /dev/evms/.nodes/sdt
>      20      65       64       20      active sync   /dev/evms/.nodes/sdu
>      21      65       80       21      active sync   /dev/evms/.nodes/sdv
>      22      65       96       22      active sync   /dev/evms/.nodes/sdw
>      23      65      112       23      active sync   /dev/evms/.nodes/sdx
>      24      65      128       24      active sync   /dev/evms/.nodes/sdy
>      25      65      144       25      active sync   /dev/evms/.nodes/sdz
>      26       0        0        -      removed
>      27      65      176       27      active sync   
> /dev/evms/.nodes/sdab
>
>      28      65      160        -      spare   /dev/evms/.nodes/sdaa
>
>
> I've got 28 devices, 1 spare, 27 active. I'm still running as clean, 
> degraded.
>
> What do I do next? What I wanted to do was to put /dev/sdaa back in as 
> device 26, but now it's device 28 - and flagged as spare. How do I 
> make it active in the array again?
>
> -- David M. Strang
>
>
> ----- Original Message ----- From: Neil Brown
> To: David M. Strang
> Cc: linux-raid@vger.kernel.org
> Sent: Sunday, July 17, 2005 9:33 PM
> Subject: Re: Raid5 Failure
>
> Ahhhh...  I cannot read my own code, that is the problem!!
>
> This patch should fix it.
>
> Thanks for persisting.
>
> NeilBrown
>
> Signed-off-by: Neil Brown <neilb@cse.unsw.edu.au>
>
> ### Diffstat output
> ./Manage.c |    7 ++-----
> 1 files changed, 2 insertions(+), 5 deletions(-)
>
> diff ./Manage.c~current~ ./Manage.c
> --- ./Manage.c~current~ 2005-07-07 09:19:53.000000000 +1000
> +++ ./Manage.c 2005-07-18 11:31:57.000000000 +1000
> @@ -204,11 +204,8 @@ int Manage_subdevs(char *devname, int fd
>  return 1;
>  }
>  close(tfd);
> -#if 0
> - if (array.major_version == 0) {
> -#else
> - if (md_get_version(fd)%100 < 2) {
> -#endif
> + if (array.major_version == 0 &&
> +     md_get_version(fd)%100 < 2) {
>  if (ioctl(fd, HOT_ADD_DISK,
>    (unsigned long)stb.st_rdev)==0) {
>  fprintf(stderr, Name ": hot added %s\n",
> -
> -
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