Disk failure & very slow rebuild

BX787 · 23. März 2015

Hi,

first of all sorry for my english. An answer in german is also welcome.

I have 6x 3TB Seagate st3000dm001 in a raid 5 setup. This Setup is now running for a long time. A few month ago, ohne drive crashed and i changed it without any problems. Rebuild takes about 3 or 4 days.

Now I have the following problem. If i played music from my storage sometime the music lags. The CPU load of the storage was often very high. I didn't find the reason. One day one disk fails without any smart errors. I put this disk in another pc and check it. There was no Smart error, no rellocated sectore, etc. The disk works. So I decided to wipe the drive and put it back in the storage. Every went fine, but the resync speed is very very slow (Takes about 10 Days).

I've tried to speedup the rebuild with editing sysctl.conf, add bitmap indexes, etc. But the speed didn't changed. At the moment the CPU has no load while rebuilding.

Is this speed normal in such an raid setup? Could the disk be damaged (no problem with sectors but perhaps an controller problem?)?

Code

mdadm --detail /dev/md127
/dev/md127:
        Version : 1.2
  Creation Time : Thu Jan 24 20:24:42 2013
     Raid Level : raid5
     Array Size : 14651327120 (13972.59 GiB 15002.96 GB)
  Used Dev Size : 2930265424 (2794.52 GiB 3000.59 GB)
   Raid Devices : 6
  Total Devices : 6
    Persistence : Superblock is persistent


  Intent Bitmap : Internal


    Update Time : Mon Mar 23 13:01:29 2015
          State : active, degraded, recovering
 Active Devices : 5
Working Devices : 6
 Failed Devices : 0
  Spare Devices : 1


         Layout : left-symmetric
     Chunk Size : 16K


 Rebuild Status : 0% complete


           Name : openmediavault:SG01
           UUID : 8de9f199:c6e4b147:9b8e008d:dde34fc3
         Events : 144519


    Number   Major   Minor   RaidDevice State
       0       8       64        0      active sync   /dev/sde
       7       8       96        1      active sync   /dev/sdg
       6       8       80        2      active sync   /dev/sdf
       5       8       32        3      active sync   /dev/sdc
       8       8       16        4      spare rebuilding   /dev/sdb
       3       8        0        5      active sync   /dev/sda

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Code

Every 1,0s: cat /proc/mdstat                            Mon Mar 23 13:01:06 2015


Personalities : [raid6] [raid5] [raid4]
md127 : active raid5 sdb[8] sde[0] sda[3] sdc[5] sdf[6] sdg[7]
      14651327120 blocks super 1.2 level 5, 16k chunk, algorithm 2 [6/5] [UUUU_U
]
      [>....................]  recovery =  0.0% (2426964/2930265424) finish=1331
3.1min speed=3665K/sec
      bitmap: 13/22 pages [52KB], 65536KB chunk


unused devices: <none>

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Thank you!

Greetings

Alex

BX787 · 1. April 2015

Hi,

because i haven't found an answer, I decided to bought a new drive. Now it looks good.

Code

Every 1,0s: cat /proc/mdstat                            Wed Apr  1 19:36:17 2015


Personalities : [raid6] [raid5] [raid4]
md127 : active raid5 sdg[8] sdb[0] sde[3] sdf[5] sdc[6] sdd[7]
      14651327120 blocks super 1.2 level 5, 16k chunk, algorithm 2 [6/5] [UUUU_U
]
      [>....................]  recovery =  0.1% (3947080/2930265424) finish=1949
.2min speed=25020K/sec
      bitmap: 13/22 pages [52KB], 65536KB chunk


unused devices: <none>

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