I have a RAID (mirrored - 2 spinning rust hard-drives).
In the past two weeks, it happened 2 or 3 times, that the raid hasn't been displayed in KDE's Dolphin (file browser), anymore.
This was the output of cat /proc/mdstat when it happened just a minute ago.
Personalities :
md127 : inactive sdd1[0](S)
7813894144 blocks super 1.2
unused devices: <none>
After a reboot, everything works as expected again.
$ cat /proc/mdstat
Personalities : [raid1]
md127 : active (auto-read-only) raid1 sdd1[0] sdc1[2]
7813893952 blocks super 1.2 [2/2] [UU]
unused devices: <none>
I also just noticed, that the number of blocks differs slightly between both outputs.
Since I live in a place, that is now transitioning into winter (colder and more humid, than in summer .. about 50% humidity at about 20°C .. so not that cold, yet), I'm not sure, if it could have anything to do with that? Because, it only happens once, when I first turn on the computer in the morning (after a night of rest and at a cooled down state). After that, everything works fine (even wrote a couple of hundred GB of data onto them, recently without any problems, whatsoever).
But, I'm still a bit worried, because that's a mirrored drive for a reason (I really need that data not to get lost).
Is this my cue to get another set of hard-drives (they're not cheap, at the moment and I'd rather not have to buy new ones, at the moment)? Or can I do anything to make things better, that I might not be thinking of, right now?
That's the output of mdadm --detail /dev/md127
/dev/md127:
Version : 1.2
Creation Time : Sun Jul 17 12:47:48 2016
Raid Level : raid1
Array Size : 7813893952 (7.28 TiB 8.00 TB)
Used Dev Size : 7813893952 (7.28 TiB 8.00 TB)
Raid Devices : 2
Total Devices : 2
Persistence : Superblock is persistent
Update Time : Thu Oct 20 12:29:25 2022
State : clean
Active Devices : 2
Working Devices : 2
Failed Devices : 0
Spare Devices : 0
Consistency Policy : resync
Name : k1:0
UUID : 12345678:12345678:12345678:12345678
Events : 50521
Number Major Minor RaidDevice State
0 8 49 0 active sync /dev/sdd1
2 8 33 1 active sync /dev/sdc1
