Hi Roger, Hi List,

With a high heart bit rate I tried this:

mdadm --create /dev/md0 --assume-clean --level=5 --raid-devices=5  /dev/sdb /dev/sdc /dev/sde /dev/sdd missing

IT WORKED!

Now I have mounted my date back.

BUT:

1. I have one failing disk according to SMART (that is /dev/sdc)

2. /dev/sdb and /dev/sdd have a little smaller size then the others:

blockdev --getsz /dev/sdb /dev/sdc /dev/sdd /dev/sde /dev/sdf
1953523055
1953525168
1953523055
1953525168
1953523055

The idea to re-create the array came from here:

http://ubuntuforums.org/showthread.php?t=1736742&p=10708294#post10708294

Now I will replace the two different disks and will upgrade to RAID-6.

Any hints what might have been the issue?

As mentioned on the exactly previous post, all seamed to be in order
with the array.


Kind Regards,
Theophanis Kontogiannis

ΜΦΧ
ΘΚ

On 24/07/14 03:06, Roger Heflin wrote:

it shows one of the disks as not fresh (sdb) and it shows sdd and sdf
as not being found with a valid superblock at all.

You probably need to do some looking around and see if you can figure
out where they are or what is going on.

This may help you find them:
mdadm --examine /dev/<device>
you may need to repeat for any and all unused devices you find on the
system and then fix whatever caused the disks to be missing or use the
device it is now at.

On Wed, Jul 23, 2014 at 12:58 PM, Theophanis Kontogiannis
[off-list ref] wrote:

quoted

Hi Roger,

Thank you for the info.

Results:

[root ~#] mdadm --assemble --force /dev/md0 /dev/sdb /dev/sdc /dev/sdd
/dev/sde /dev/sdf
mdadm: Marking array /dev/md0 as 'clean'
mdadm: failed to add /dev/sdd to /dev/md0: Invalid argument
mdadm: failed to add /dev/sdf to /dev/md0: Invalid argument
mdadm: failed to RUN_ARRAY /dev/md0: Input/output error
[root ~#]

md: sdd does not have a valid v1.2 superblock, not importing!
md: md_import_device returned -22
md: bind<sde>
md: sdf does not have a valid v1.2 superblock, not importing!
md: md_import_device returned -22
md: bind<sdc>
md: kicking non-fresh sdb from array!
md: unbind<sdb>
md: export_rdev(sdb)
bio: create slab <bio-1> at 1
md/raid:md0: device sdc operational as raid disk 1
md/raid:md0: device sde operational as raid disk 3
md/raid:md0: allocated 5366kB
md/raid:md0: not enough operational devices (3/5 failed)
RAID conf printout:
 --- level:5 rd:5 wd:2
 disk 1, o:1, dev:sdc
 disk 3, o:1, dev:sde
md/raid:md0: failed to run raid set.
md: pers->run() failed ...



[root@tweety ~]# cat /proc/mdstat
Personalities : [raid6] [raid5] [raid4]
md0 : inactive sdc[1] sde[4]
      1953263024 blocks super 1.2

unused devices: <none>



Anything else I could do?


Kind Regards,
Theophanis Kontogiannis

ΜΦΧ
ΘΚ

On 23/07/14 03:10, Roger Heflin wrote:

quoted

mdadm --stop /dev/mdXX stop
mdadm --assemble --force /dev/mdXX <list all devices good or bad that
were previously in the array>

The assemble with force should make it turn it on with enough disks.
Then re-add the remaining.

I have had to do this a number of times when a subset of my sata ports acted up.

On Tue, Jul 22, 2014 at 5:11 PM, Theophanis Kontogiannis
[off-list ref] wrote:

quoted

Dear List.

Hello.

I have the following problem with my CEntOS 6.5 RAID-5

Array of five disks.

At some point in time I added the fifth disk, however I do not remember
if I added it as a spare or to go up to RAID-6.

The power and faulty UPS caught me so my RAID-5 has failed (alongside
with the on board controller :) )

After replacing the MB, I am in the following situation:

        /dev/md0:
                Version : 1.2
          Creation Time : Fri Feb 21 18:06:31 2014
             Raid Level : raid5
          Used Dev Size : 976630272 (931.39 GiB 1000.07 GB)
           Raid Devices : 5
          Total Devices : 2
            Persistence : Superblock is persistent

            Update Time : Sat Jul 12 22:11:39 2014
                  State : active, FAILED, Not Started
         Active Devices : 2
        Working Devices : 2
         Failed Devices : 0
          Spare Devices : 0

                 Layout : left-symmetric
             Chunk Size : 512K

                   Name : tweety.example.com:0  (local to host
        tweety.example.com)
                   UUID : 953836cd:23314476:5db06922:c886893d
                 Events : 16855

            Number   Major   Minor   RaidDevice State
               0       0        0        0      removed
               1       8       32        1      active sync   /dev/sdc
               2       0        0        2      removed
               4       8       64        3      active sync   /dev/sde
               4       0        0        4      removed



Every effort to add at least one more disk ends up in error:

[root ~]# mdadm /dev/md0 --re-add /dev/sdd
mdadm: --re-add for /dev/sdd to /dev/md0 is not possible

I also made sure that the devices are in the correct physical order.


    mdadm --examine /dev/sd[b-f]


        /dev/sdb:
                  Magic : a92b4efc
                Version : 1.2
            Feature Map : 0x2
             Array UUID : 953836cd:23314476:5db06922:c886893d
                   Name : tweety.example.com:0  (local to host
        tweety.example.com)
          Creation Time : Fri Feb 21 18:06:31 2014
             Raid Level : raid5
           Raid Devices : 5

         Avail Dev Size : 1953260911 (931.39 GiB 1000.07 GB)
             Array Size : 3906521088 (3725.55 GiB 4000.28 GB)
          Used Dev Size : 1953260544 (931.39 GiB 1000.07 GB)
            Data Offset : 262144 sectors
           Super Offset : 8 sectors
        Recovery Offset : 0 sectors
                  State : active
            Device UUID : 7117d844:783abda5:093ee4d9:ba0ac2f0

            Update Time : Sat Jul 12 21:32:42 2014
               Checksum : 31569c40 - correct
                 Events : 16845

                 Layout : left-symmetric
             Chunk Size : 512K

           Device Role : Active device 0
           Array State : AAAAA ('A' == active, '.' == missing)
        /dev/sdc:
                  Magic : a92b4efc
                Version : 1.2
            Feature Map : 0x0
             Array UUID : 953836cd:23314476:5db06922:c886893d
                   Name : tweety.example.com:0  (local to host
        tweety.example.com)
          Creation Time : Fri Feb 21 18:06:31 2014
             Raid Level : raid5
           Raid Devices : 5

         Avail Dev Size : 1953263024 (931.39 GiB 1000.07 GB)
             Array Size : 3906521088 (3725.55 GiB 4000.28 GB)
          Used Dev Size : 1953260544 (931.39 GiB 1000.07 GB)
            Data Offset : 262144 sectors
           Super Offset : 8 sectors
                  State : active
            Device UUID : 18bf4347:08c262ec:694eba7f:eb8e6b26

            Update Time : Sat Jul 12 22:11:39 2014
               Checksum : 55e8716a - correct
                 Events : 16855

                 Layout : left-symmetric
             Chunk Size : 512K

           Device Role : Active device 1
           Array State : .AAAA ('A' == active, '.' == missing)
        /dev/sdd:
                  Magic : a92b4efc
                Version : 1.2
            Feature Map : 0x0
             Array UUID : 953836cd:23314476:5db06922:c886893d
                   Name : tweety.example.com:0  (local to host
        tweety.example.com)
          Creation Time : Fri Feb 21 18:06:31 2014
             Raid Level : raid5
           Raid Devices : 5

         Avail Dev Size : 1953263024 (931.39 GiB 1000.07 GB)
             Array Size : 3906521088 (3725.55 GiB 4000.28 GB)
          Used Dev Size : 1953260544 (931.39 GiB 1000.07 GB)
            Data Offset : 262144 sectors
           Super Offset : 8 sectors
                  State : active
            Device UUID : 4f77c847:2f567632:66bb5600:9fb2eeba

            Update Time : Sat Jul 12 21:32:42 2014
               Checksum : b19f455b - correct
                 Events : 16855

                 Layout : left-symmetric
             Chunk Size : 512K

           Device Role : Active device 2
           Array State : AAAAA ('A' == active, '.' == missing)
        /dev/sde:
                  Magic : a92b4efc
                Version : 1.2
            Feature Map : 0x0
             Array UUID : 953836cd:23314476:5db06922:c886893d
                   Name : tweety.example.com:0  (local to host
        tweety.example.com)
          Creation Time : Fri Feb 21 18:06:31 2014
             Raid Level : raid5
           Raid Devices : 5

         Avail Dev Size : 1953263024 (931.39 GiB 1000.07 GB)
             Array Size : 3906521088 (3725.55 GiB 4000.28 GB)
          Used Dev Size : 1953260544 (931.39 GiB 1000.07 GB)
            Data Offset : 262144 sectors
           Super Offset : 8 sectors
                  State : active
            Device UUID : 51b43b6e:7bb8a070:f6375540:28e0b75c

            Update Time : Sat Jul 12 22:11:39 2014
               Checksum : f80197e3 - correct
                 Events : 16855

                 Layout : left-symmetric
             Chunk Size : 512K

           Device Role : Active device 3
           Array State : .A.AA ('A' == active, '.' == missing)
        /dev/sdf:
                  Magic : a92b4efc
                Version : 1.2
            Feature Map : 0x0
             Array UUID : 953836cd:23314476:5db06922:c886893d
                   Name : tweety.example.com:0  (local to host
        tweety.example.com)
          Creation Time : Fri Feb 21 18:06:31 2014
             Raid Level : raid5
           Raid Devices : 5

         Avail Dev Size : 1953263024 (931.39 GiB 1000.07 GB)
             Array Size : 3906521088 (3725.55 GiB 4000.28 GB)
          Used Dev Size : 1953260544 (931.39 GiB 1000.07 GB)
            Data Offset : 262144 sectors
           Super Offset : 8 sectors
                  State : clean
            Device UUID : 9f7b1355:936e12f2:813c83a0:13854a6b

            Update Time : Sat Jul 12 22:11:39 2014
               Checksum : cf0bbec1 - correct
                 Events : 16855

                 Layout : left-symmetric
             Chunk Size : 512K

           Device Role : Active device 4
           Array State : .A.AA ('A' == active, '.' == missing)


Any chance to revive this array?


--

Kind Regards,
Theophanis Kontogiannis

ΜΦΧ
ΘΚ



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