Hello.
I have a Raspberry Pi 4 with a SATA HAT with 4 disks mounted:
1x SSD: (Dockers)
3x Seagate on RAID 5
The problem I have is that after a few days the raid gives error and expels one of the days. It is always the same (sdd). I add it again with the following command and it works again some days until the problem repeats.
sudo mdadm --add /dev/md0 /dev/sdd
Could you help me with what might be happening?
Attached is some information I have collected that may be of interest to you.
Thank you very much.
Current status of the raid after the error:
pi@RPi4-NAS:~ $ sudo mdadm --query --detail /dev/md0
/dev/md0:
-
Version : 1.2* -
Creation Time : Fri Jun 26 11:28:37 2020* -
Raid Level : raid5* -
Array Size : 1953260928 (1862.77 GiB 2000.14 GB)* -
Used Dev Size : 976630464 (931.39 GiB 1000.07 GB)* -
Raid Devices : 3* -
Total Devices : 2* -
Persistence : Superblock is persistent* -
Intent Bitmap : Internal* -
Update Time : Mon Sep 7 03:00:55 2020* -
State : clean, degraded * -
Active Devices : 2*
-
Working Devices : 2*
-
Failed Devices : 0*
-
Spare Devices : 0* -
Layout : left-symmetric* -
Chunk Size : 64K*
Consistency Policy : bitmap
-
Name : RPi4-NAS:0 (local to host RPi4-NAS)* -
UUID : 356a6b5d:57d0cf44:ad0bece1:8a270779* -
Events : 2736* -
Number Major Minor RaidDevice State*
-
0 8 32 0 active sync /dev/sdc* -
- 0 0 1 removed* -
3 8 64 2 active sync*
This is the alert that OMV sends when the error occurs:
This is an automatically generated mail message from mdadm
running on RPi4-NAS
A Fail event had been detected on md device /dev/md0.
It could be related to component device /dev/sdd.
Faithfully yours, etc.
P.S. The /proc/mdstat file currently contains the following:
*Personalities : [raid6] [raid5] [raid4] *
md0 : active raid5 sdd1 sde[3] sdc[0]
-
1953260928 blocks super 1.2 level 5, 64k chunk, algorithm 2 [3/2] [U_U]* -
bitmap: 0/8 pages [0KB], 65536KB chunk*
unused devices:
Devices:
