ADM 3.5.1.R8C1
Bios 0.31/1.0023
When trying to find out the cause of the problem I dumped the diagnostic log. It is full of those entries:
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01/10/2020 16:21 mdadm Storage Management Tools Volume1 READ
01/10/2020 16:21 mdadm Storage Management Tools Volume1 WRITE
01/10/2020 16:21 mdadm Storage Management Tools Volume1 READ
01/10/2020 16:21 mdadm Storage Management Tools Volume1 WRITE
01/10/2020 16:21 mdadm Storage Management Tools Volume1 READ
01/10/2020 16:20 mdadm Storage Management Tools Volume1 WRITE
01/10/2020 16:20 mdadm Storage Management Tools Volume1 READ
01/10/2020 16:20 mdadm Storage Management Tools Volume1 WRITE
01/10/2020 16:20 mdadm Storage Management Tools Volume1 READ
01/10/2020 16:19 mdadm Storage Management Tools Volume1 WRITE
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root@AS-302T-F4E0:/volume1/.@root # cat /proc/mdstat
Personalities : [linear] [raid0] [raid1] [raid10] [raid6] [raid5] [raid4]
md1 : active raid1 sdb4[2] sda4[3]
3902560064 blocks super 1.2 [2/2] [UU]
md126 : active raid1 sdb3[0] sda3[2]
2095104 blocks super 1.2 [2/2] [UU]
md0 : active raid1 sdb2[3] sda2[2]
2096064 blocks super 1.2 [2/2] [UU]
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root@AS-302T-F4E0:/volume1/.@root # sudo mdadm --detail /dev/md1
/dev/md1:
Version : 1.2
Creation Time : Wed Feb 1 20:39:15 2017
Raid Level : raid1
Array Size : 3902560064 (3721.77 GiB 3996.22 GB)
Used Dev Size : 3902560064 (3721.77 GiB 3996.22 GB)
Raid Devices : 2
Total Devices : 2
Persistence : Superblock is persistent
Update Time : Thu Oct 1 15:04:14 2020
State : clean
Active Devices : 2
Working Devices : 2
Failed Devices : 0
Spare Devices : 0
Name : AS-302T-F4E0:1 (local to host AS-302T-F4E0)
UUID : 9d78946a:d536d508:1080b8aa:445f8ba7
Events : 365248
Number Major Minor RaidDevice State
2 8 20 0 active sync /dev/sdb4
3 8 4 1 active sync /dev/sda4
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root@AS-302T-F4E0:/volume1/.@root # sudo mdadm --detail /dev/md126
/dev/md126:
Version : 1.2
Creation Time : Wed Apr 1 18:51:42 2020
Raid Level : raid1
Array Size : 2095104 (2046.34 MiB 2145.39 MB)
Used Dev Size : 2095104 (2046.34 MiB 2145.39 MB)
Raid Devices : 2
Total Devices : 2
Persistence : Superblock is persistent
Update Time : Wed Sep 30 16:33:59 2020
State : clean
Active Devices : 2
Working Devices : 2
Failed Devices : 0
Spare Devices : 0
Name : AS-302T-F4E0:126 (local to host AS-302T-F4E0)
UUID : 5ceeb217:a889bd81:474760b5:0185eb86
Events : 2211
Number Major Minor RaidDevice State
0 8 19 0 active sync /dev/sdb3
2 8 3 1 active sync /dev/sda3
It seems that it should not be doing anything, but it does:
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root@AS-302T-F4E0:/volume1/.@root # grep . /sys/block/*/md/sync_action
/sys/block/md0/md/sync_action:idle
/sys/block/md1/md/sync_action:idle
/sys/block/md126/md/sync_action:idle