Thread (1 message) 1 message, 1 author, 2017-08-25

RE: force raid reassembly

From: Bryan Hepworth <hidden>
Date: 2017-08-25 08:03:42 

-----Original Message-----
From: Anthony Youngman [mailto:antlists@youngman.org.uk]
Sent: 12 August 2017 18:44
To: Joe Landman; Bryan Hepworth; linux-raid@vger.kernel.org
Subject: Re: force raid reassembly

Only thing is, sdb1 says "AAA.AA", which is a bit weird, unless sdb1 is
the very last one, which is the last dot in AAA.A. of all the others.

If five drives all have almost identical event counts, I'd be inclined
to ddrescue the dodgy one (probably sdb1) and hope it all works out.

The alternative is to ddrescue both dodgy drives, and write the program
that marks blocks as dodgy. Then you can hope that a scan can rebuild
everything.

Cheers,
Wol
Hi Anthony

I've got another quick question, hope you can see what you reckon...

The disks are in an md1200 storage shelf and all seem to have settled down now. Could you take a quick look at the output and see if you think the same advice stands.

Thanks so much.

Bryan

[root@inscribe4 ~]# cat /proc/mdstat
Personalities : [raid6] [raid5] [raid4]
md125 : active (auto-read-only) raid5 sdh1[4] sdg1[6] sdi1[3] sdk1[1] sdl1[0] sdj1[7]
      9767552000 blocks super 1.2 level 5, 512k chunk, algorithm 2 [6/6] [UUUUUU]
      bitmap: 0/15 pages [0KB], 65536KB chunk

md126 : inactive sdb1[4] sde1[7] sdc1[0] sdf1[1] sdd1[8](S)
      9766904645 blocks super 1.2

md127 : active (auto-read-only) raid6 sdo[2] sdq[4] sdm[0] sdw[10] sdt[12] sds[6] sdn[1] sdr[5] sdu[8] sdp[3] sdx[11] sdv[9]
      19535129600 blocks super 1.2 level 6, 512k chunk, algorithm 2 [12/12] [UUUUUUUUUUUU]
      bitmap: 0/15 pages [0KB], 65536KB chunk

unused devices: <none>
[root@inscribe4 ~]# mdadm --examine /dev/sda1
/dev/sda1:
          Magic : a92b4efc
        Version : 1.2
    Feature Map : 0x1
     Array UUID : ace00fb5:8771d55a:cf36728b:ddc3ce89
           Name : intermediate0
  Creation Time : Tue Oct 15 21:03:50 2013
     Raid Level : raid5
   Raid Devices : 6

 Avail Dev Size : 3906761858 (1862.89 GiB 2000.26 GB)
     Array Size : 9766901760 (9314.44 GiB 10001.31 GB)
  Used Dev Size : 3906760704 (1862.89 GiB 2000.26 GB)
    Data Offset : 262144 sectors
   Super Offset : 8 sectors
   Unused Space : before=262064 sectors, after=1154 sectors
          State : clean
    Device UUID : a84263cd:75ce20b9:a3a72a1c:b18b2457

Internal Bitmap : 8 sectors from superblock
    Update Time : Mon Jul 31 22:50:37 2017
       Checksum : 74d320d6 - correct
         Events : 119879

         Layout : left-symmetric
     Chunk Size : 512K

   Device Role : Active device 5
   Array State : AAA.AA ('A' == active, '.' == missing, 'R' == replacing)
   
[root@inscribe4 ~]# mdadm --examine /dev/sdb1
/dev/sdb1:
          Magic : a92b4efc
        Version : 1.2
    Feature Map : 0x1
     Array UUID : ace00fb5:8771d55a:cf36728b:ddc3ce89
           Name : intermediate0
  Creation Time : Tue Oct 15 21:03:50 2013
     Raid Level : raid5
   Raid Devices : 6

 Avail Dev Size : 3906761858 (1862.89 GiB 2000.26 GB)
     Array Size : 9766901760 (9314.44 GiB 10001.31 GB)
  Used Dev Size : 3906760704 (1862.89 GiB 2000.26 GB)
    Data Offset : 262144 sectors
   Super Offset : 8 sectors
   Unused Space : before=262064 sectors, after=1154 sectors
          State : clean
    Device UUID : be5ec20e:249645e5:22aeca25:a60c7599

Internal Bitmap : 8 sectors from superblock
    Update Time : Tue Aug  8 14:16:53 2017
       Checksum : 2e529fae - correct
         Events : 119894

         Layout : left-symmetric
     Chunk Size : 512K

   Device Role : Active device 4
   Array State : AAA.A. ('A' == active, '.' == missing, 'R' == replacing)
   
[root@inscribe4 ~]# mdadm --examine /dev/sdc1
/dev/sdc1:
          Magic : a92b4efc
        Version : 1.2
    Feature Map : 0x1
     Array UUID : ace00fb5:8771d55a:cf36728b:ddc3ce89
           Name : intermediate0
  Creation Time : Tue Oct 15 21:03:50 2013
     Raid Level : raid5
   Raid Devices : 6

 Avail Dev Size : 3906761858 (1862.89 GiB 2000.26 GB)
     Array Size : 9766901760 (9314.44 GiB 10001.31 GB)
  Used Dev Size : 3906760704 (1862.89 GiB 2000.26 GB)
    Data Offset : 262144 sectors
   Super Offset : 8 sectors
   Unused Space : before=262064 sectors, after=1154 sectors
          State : clean
    Device UUID : 1732f121:f6f0df09:fafd2411:7c78ce00

Internal Bitmap : 8 sectors from superblock
    Update Time : Tue Aug  8 14:16:53 2017
       Checksum : b8cf8981 - correct
         Events : 119894

         Layout : left-symmetric
     Chunk Size : 512K

   Device Role : Active device 0
   Array State : AAA.A. ('A' == active, '.' == missing, 'R' == replacing)
   
[root@inscribe4 ~]# mdadm --examine /dev/sdd1
/dev/sdd1:
          Magic : a92b4efc
        Version : 1.2
    Feature Map : 0x1
     Array UUID : ace00fb5:8771d55a:cf36728b:ddc3ce89
           Name : intermediate0
  Creation Time : Tue Oct 15 21:03:50 2013
     Raid Level : raid5
   Raid Devices : 6

 Avail Dev Size : 3906761858 (1862.89 GiB 2000.26 GB)
     Array Size : 9766901760 (9314.44 GiB 10001.31 GB)
  Used Dev Size : 3906760704 (1862.89 GiB 2000.26 GB)
    Data Offset : 262144 sectors
   Super Offset : 8 sectors
   Unused Space : before=262064 sectors, after=1154 sectors
          State : clean
    Device UUID : 8d0b6c8e:0c526265:6ec0a71b:52a636ba

Internal Bitmap : 8 sectors from superblock
    Update Time : Tue Aug  8 14:16:53 2017
       Checksum : 44b7b461 - correct
         Events : 119894

         Layout : left-symmetric
     Chunk Size : 512K

   Device Role : spare
   Array State : AAA.A. ('A' == active, '.' == missing, 'R' == replacing)
   
[root@inscribe4 ~]# mdadm --examine /dev/sde1
/dev/sde1:
          Magic : a92b4efc
        Version : 1.2
    Feature Map : 0x1
     Array UUID : ace00fb5:8771d55a:cf36728b:ddc3ce89
           Name : intermediate0
  Creation Time : Tue Oct 15 21:03:50 2013
     Raid Level : raid5
   Raid Devices : 6

 Avail Dev Size : 3906761858 (1862.89 GiB 2000.26 GB)
     Array Size : 9766901760 (9314.44 GiB 10001.31 GB)
  Used Dev Size : 3906760704 (1862.89 GiB 2000.26 GB)
    Data Offset : 262144 sectors
   Super Offset : 8 sectors
   Unused Space : before=262064 sectors, after=1154 sectors
          State : clean
    Device UUID : 3d414ad2:4310c1f9:98f50214:3e9b1e33

Internal Bitmap : 8 sectors from superblock
    Update Time : Tue Aug  8 14:16:53 2017
       Checksum : 8e37d25d - correct
         Events : 119894

         Layout : left-symmetric
     Chunk Size : 512K

   Device Role : Active device 2
   Array State : AAA.A. ('A' == active, '.' == missing, 'R' == replacing)
   
[root@inscribe4 ~]# mdadm --examine /dev/sdf1
/dev/sdf1:
          Magic : a92b4efc
        Version : 1.2
    Feature Map : 0x1
     Array UUID : ace00fb5:8771d55a:cf36728b:ddc3ce89
           Name : intermediate0
  Creation Time : Tue Oct 15 21:03:50 2013
     Raid Level : raid5
   Raid Devices : 6

 Avail Dev Size : 3906761858 (1862.89 GiB 2000.26 GB)
     Array Size : 9766901760 (9314.44 GiB 10001.31 GB)
  Used Dev Size : 3906760704 (1862.89 GiB 2000.26 GB)
    Data Offset : 262144 sectors
   Super Offset : 8 sectors
   Unused Space : before=262064 sectors, after=1154 sectors
          State : clean
    Device UUID : e238e74b:d40efc43:d34d876d:ca0700b0

Internal Bitmap : 8 sectors from superblock
    Update Time : Tue Aug  8 14:16:53 2017
       Checksum : 28758d54 - correct
         Events : 119894

         Layout : left-symmetric
     Chunk Size : 512K

   Device Role : Active device 1
   Array State : AAA.A. ('A' == active, '.' == missing, 'R' == replacing)
[root@inscribe4 ~]#
   
   

  




  

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