Hi
I had the same situation except there was no power loss.
At the morning I saw the red led blinking and there was no access to anything.
I have raid6 with 4 drives + one missing (I need to buy one and add)
mdadm -D /dev/md0
/dev/md0:
Version : 1.2
Raid Level : raid0
Total Devices : 5
Persistence : Superblock is persistent
State : inactive
Working Devices : 5
Name : helios64:0 (local to host helios64)
UUID : 7530fb03:c90e2f01:e0d78a6e:14097e55
Events : 107318
Number Major Minor RaidDevice
- 8 1 - /dev/sda1
- 8 65 - /dev/sde1
- 8 49 - /dev/sdd1
- 8 33 - /dev/sdc1
- 8 17 - /dev/sdb1
mdadm -E /dev/sda1
/dev/sda1:
Magic : a92b4efc
Version : 1.2
Feature Map : 0x1
Array UUID : 7530fb03:c90e2f01:e0d78a6e:14097e55
Name : helios64:0 (local to host helios64)
Creation Time : Sun Dec 27 16:58:41 2020
Raid Level : raid6
Raid Devices : 5
Avail Dev Size : 11720583168 (5588.81 GiB 6000.94 GB)
Array Size : 17580874752 (16766.43 GiB 18002.82 GB)
Data Offset : 264192 sectors
Super Offset : 8 sectors
Unused Space : before=264112 sectors, after=0 sectors
State : active
Device UUID : 78ccd511:bbb3a836:60faeece:2fbccc9c
Internal Bitmap : 8 sectors from superblock
Update Time : Tue Dec 29 10:17:01 2020
Bad Block Log : 512 entries available at offset 32 sectors
Checksum : f954d241 - correct
Events : 107318
Layout : left-symmetric
Chunk Size : 512K
Device Role : Active device 0
Array State : AA.AA ('A' == active, '.' == missing, 'R' == replacing)
After stopping and reassembling the array with the force option I have access to files.
cat /proc/mdstat
Personalities : [linear] [multipath] [raid0] [raid1] [raid6] [raid5] [raid4] [raid10]
md0 : active raid6 sda1[0] sde1[4] sdd1[3] sdb1[1]
17580874752 blocks super 1.2 level 6, 512k chunk, algorithm 2 [5/4] [UU_UU]
[>....................] resync = 0.2% (12862976/5860291584) finish=1082.6min speed=90012K/sec
bitmap: 44/44 pages [176KB], 65536KB chunk
unused devices: <none>
1. I don't understand what MD is resyncing, there were 4 active drives and are 4 active drives - nothing changed, so why resyncing?
2. I'm really concerned about this situation - there was no reason to that situation, there was no power outage nor any other reason I see, it just stopped working at the night
