Hi,
I currently experience a "problem" with a raid5 I built. As soon as I have mounted the filesystem on it (ext4)
a md127_raid5 process will do writes every few seconds to all the members:
md127_raid5(4044): WRITE block 16 on sdb1 (8 sectors)
md127_raid5(4044): WRITE block 16 on sdc1 (8 sectors)
md127_raid5(4044): WRITE block 16 on sda1 (8 sectors)
md127_raid5(4044): WRITE block 16 on sdg1 (8 sectors)
md127_raid5(4044): WRITE block 16 on sdh1 (8 sectors)
md127_raid5(4044): WRITE block 8 on sdb1 (1 sectors)
md127_raid5(4044): WRITE block 8 on sdc1 (1 sectors)
md127_raid5(4044): WRITE block 8 on sda1 (1 sectors)
md127_raid5(4044): WRITE block 8 on sdg1 (1 sectors)
md127_raid5(4044): WRITE block 8 on sdh1 (1 sectors)
Disabling the journal of the filesystem does not make a difference. Same for changing the bitmap to none for
the RAID. I'm wondering what is happening here that keeps my drives active. This only stops when unmounting
the filesystem. There are no logged writes/reads to the md devices itself at the same time.
I'm currently running Kernel 4.9.0-11
/dev/md127:
Version : 1.2
Creation Time : Sat Dec 21 22:20:21 2019
Raid Level : raid5
Array Size : 19534553088 (18629.60 GiB 20003.38 GB)
Used Dev Size : 4883638272 (4657.40 GiB 5000.85 GB)
Raid Devices : 5
Total Devices : 5
Persistence : Superblock is persistent
Intent Bitmap : Internal
Update Time : Mon Dec 30 03:31:26 2019
State : clean
Active Devices : 5
Working Devices : 5
Failed Devices : 0
Spare Devices : 0
Layout : left-symmetric
Chunk Size : 512K
Name : mediapc:myraid5 (local to host mediapc)
UUID : 386efd19:1cc165f6:937ac197:810a3afa
Events : 68301
Number Major Minor RaidDevice State
0 8 113 0 active sync /dev/sdh1
1 8 97 1 active sync /dev/sdg1
3 8 1 2 active sync /dev/sda1
5 8 17 3 active sync /dev/sdb1
4 8 33 4 active sync /dev/sdc1
Thanks,
Norbert
