NAS542 resync loop

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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?

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  • Mijzelf
    Mijzelf Posts: 2,723  Guru Member
    Community MVP First Anniversary 10 Comments Friend Collector
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    So what did 'mdadm --examine /dev/sd[abcd]3' say? And is it always the same disk which is resyncing?

  • linuxopa
    linuxopa Posts: 7
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    >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

    smartctl -x all drives

  • linuxopa
    linuxopa Posts: 7
    First Comment
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    drive sdb: "SCT Error Recovery Control command not supported"

    I will replace the disk
    may it help…

  • Mijzelf
    Mijzelf Posts: 2,723  Guru Member
    Community MVP First Anniversary 10 Comments Friend Collector
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    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
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    >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
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    fck. 2 drives died. after replacement it's ok.

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