NAS542 resync loop

linuxopa
linuxopa Posts: 7
First Comment
in Personal Cloud Storage

NAS542, 4 drives, Raid5, no spare, Firmware V5.21(ABAG.14)
For some time now, my NAS542 has been resynchronizing almost constantly. smartctl shows no errors on the 4 drives, mdadm --examine /dev/sd[abcd]3 also shows nothing unusual. Where can I find the trigger?

All Replies

  • Mijzelf
    Mijzelf Posts: 2,858  Guru Member
    250 Answers 2500 Comments Friend Collector Seventh Anniversary

    So what did 'mdadm --examine /dev/sd[abcd]3' say? And is it always the same disk which is resyncing?

  • linuxopa
    linuxopa Posts: 7
    First Comment

    >So what did 'mdadm --examine /dev/sd[abcd]3' say?

    ~ # mdadm --examine /dev/sd[abcd]3
    /dev/sda3:
    Magic : a92b4efc
    Version : 1.2
    Feature Map : 0x0
    Array UUID : 33f5a2f7:c031c1a9:bb1e6599:b560f407
    Name : NAS542:2 (local to host NAS542)
    Creation Time : Thu May 6 14:47:18 2021
    Raid Level : raid5
    Raid Devices : 4

    Avail Dev Size : 3898767360 (1859.08 GiB 1996.17 GB)
    Array Size : 5848151040 (5577.23 GiB 5988.51 GB)
    Data Offset : 262144 sectors
    Super Offset : 8 sectors
    State : active
    Device UUID : c5bb5b9e:4b700eb4:87f8ed8f:5b0c2c65

    Update Time : Sat Jun 22 16:34:55 2024
   Checksum : 3293770e - correct
     Events : 9712

     Layout : left-symmetric
 Chunk Size : 64K

    Device Role : Active device 0
    Array State : AAAA ('A' == active, '.' == missing)
    /dev/sdb3:
    Magic : a92b4efc
    Version : 1.2
    Feature Map : 0x0
    Array UUID : 33f5a2f7:c031c1a9:bb1e6599:b560f407
    Name : NAS542:2 (local to host NAS542)
    Creation Time : Thu May 6 14:47:18 2021
    Raid Level : raid5
    Raid Devices : 4

    Avail Dev Size : 3898767360 (1859.08 GiB 1996.17 GB)
    Array Size : 5848151040 (5577.23 GiB 5988.51 GB)
    Data Offset : 262144 sectors
    Super Offset : 8 sectors
    State : active
    Device UUID : b855ccea:2ba8de64:083c3d9c:06b381c7

    Update Time : Sat Jun 22 16:34:55 2024
   Checksum : 9e79330c - correct
     Events : 9712

     Layout : left-symmetric
 Chunk Size : 64K

    Device Role : Active device 1
    Array State : AAAA ('A' == active, '.' == missing)
    /dev/sdc3:
    Magic : a92b4efc
    Version : 1.2
    Feature Map : 0x0
    Array UUID : 33f5a2f7:c031c1a9:bb1e6599:b560f407
    Name : NAS542:2 (local to host NAS542)
    Creation Time : Thu May 6 14:47:18 2021
    Raid Level : raid5
    Raid Devices : 4

    Avail Dev Size : 3898767360 (1859.08 GiB 1996.17 GB)
    Array Size : 5848151040 (5577.23 GiB 5988.51 GB)
    Data Offset : 262144 sectors
    Super Offset : 8 sectors
    State : active
    Device UUID : efe096ae:ddcd3574:1bc65cf5:882d53f9

    Update Time : Sat Jun 22 16:34:55 2024
   Checksum : fc8be88c - correct
     Events : 9712

     Layout : left-symmetric
 Chunk Size : 64K

    Device Role : Active device 2
    Array State : AAAA ('A' == active, '.' == missing)
    /dev/sdd3:
    Magic : a92b4efc
    Version : 1.2
    Feature Map : 0x0
    Array UUID : 33f5a2f7:c031c1a9:bb1e6599:b560f407
    Name : NAS542:2 (local to host NAS542)
    Creation Time : Thu May 6 14:47:18 2021
    Raid Level : raid5
    Raid Devices : 4

    Avail Dev Size : 3898767360 (1859.08 GiB 1996.17 GB)
    Array Size : 5848151040 (5577.23 GiB 5988.51 GB)
    Data Offset : 262144 sectors
    Super Offset : 8 sectors
    State : active
    Device UUID : e7d4bbc6:1c2f01fb:32078fd9:9c644fea

    Update Time : Sat Jun 22 16:34:55 2024
   Checksum : 70aab5f0 - correct
     Events : 9712

     Layout : left-symmetric
 Chunk Size : 64K

    Device Role : Active device 3
    Array State : AAAA ('A' == active, '.' == missing)

    >And is it always the same disk which is resyncing?

    Volume1

    Bildschirmfoto vom 2024-06-22 16-46-16.jpg
    smartctl_drives_0-3.txt

    smartctl -x all drives

  • linuxopa
    linuxopa Posts: 7
    First Comment

    drive sdb: "SCT Error Recovery Control command not supported"

    I will replace the disk
    may it help…

  • Mijzelf
    Mijzelf Posts: 2,858  Guru Member
    250 Answers 2500 Comments Friend Collector Seventh Anniversary

    Did you get that 'mdadm —examine' while it was resyncing? In that case it should have been visible. How much time does a resync take? Could it be that it's the firmware partition array (2GB) which is resyncing?

    You can get more info from

    cat /proc/mdstat

    which gives the array, the rebuild status and the exact member which is resycing.

  • linuxopa
    linuxopa Posts: 7
    First Comment

    >How much time does a resync take?

    around 20h

    I have stopped all jobs that write to the nas.
    we'll see tomorrow, in the meantime 2 disks are already complaining.
    I will swap them when resync is hopefully done.

    ~ # cat /proc/mdstat
    Personalities : [linear] [raid0] [raid1] [raid10] [raid6] [raid5] [raid4]
    md2 : active raid5 sda3[5] sdb3[4] sdd3[7] sdc3[6]
    5848151040 blocks super 1.2 level 5, 64k chunk, algorithm 2 [4/3] [U_UU]
    [>....................] recovery = 0.1% (2254316/1949383680) finish=3311.6min speed=9799K/sec

    md1 : active raid1 sda2[5] sdd2[7] sdc2[6] sdb2[4]
    1998784 blocks super 1.2 [4/4] [UUUU]

    md0 : active raid1 sda1[5] sdd1[7] sdc1[6] sdb1[4]
    1997760 blocks super 1.2 [4/4] [UUUU]

    unused devices: <none>

  • linuxopa
    linuxopa Posts: 7
    First Comment

    fck. 2 drives died. after replacement it's ok.

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