Upon reboot, one of the array members will be removed from the disk pool.
The array is comprised of (4) 1TB SSD drives. Should transferring files to the array cause the CPU to spike to 100%? All other installed capabilities on the Pi 4 (portainer, pihole, etc) become non-responsive while writing files to the raid array. Is that normal?
$ sudo mdadm --query --detail /dev/md0
/dev/md0:
Version : 1.2
Creation Time : Thu Oct 15 21:11:45 2020
Raid Level : raid5
Array Size : 2929890816 (2794.16 GiB 3000.21 GB)
Used Dev Size : 976630272 (931.39 GiB 1000.07 GB)
Raid Devices : 4
Total Devices : 3
Persistence : Superblock is persistentIntent Bitmap : Internal Update Time : Sat Oct 17 13:07:07 2020 State : clean, degraded Active Devices : 3
Working Devices : 3
Failed Devices : 0
Spare Devices : 0Layout : left-symmetric Chunk Size : 512K
Consistency Policy : bitmap
Name : docker:0 (local to host docker) UUID : f01cbb7d:b011c241:813faca4:e4de038d Events : 10440 Number Major Minor RaidDevice State - 0 0 0 removed 1 8 16 1 active sync /dev/sdb 2 8 32 2 active sync /dev/sdc 4 8 48 3 active sync /dev/sdd
$ cat /proc/mdstat
Personalities : [raid6] [raid5] [raid4]
md0 : active raid5 sdd[4] sdc[2] sdb[1]
2929890816 blocks super 1.2 level 5, 512k chunk, algorithm 2 [4/3] [_UUU]
bitmap: 6/8 pages [24KB], 65536KB chunkunused devices:
$ sudo blkid
/dev/mmcblk0p1: LABEL_FATBOOT=“boot” LABEL=“boot” UUID=“592B-C92C” TYPE=“vfat” PARTUUID=“002973c0-01”
/dev/mmcblk0p2: LABEL=“rootfs” UUID=“706944a6-7d0f-4a45-9f8c-7fb07375e9f7” TYPE=“ext4” PARTUUID=“002973c0-02”
/dev/sdb: UUID=“f01cbb7d-b011-c241-813f-aca4e4de038d” UUID_SUB=“1f5e2936-fa9b-fd4b-e614-45d3e4908147” LABEL=“docker:0” TYPE=“linux_raid_member”
/dev/md0: UUID=“5498f93b-c861-4d9d-8172-5c5e31407dec” TYPE=“ext4”
/dev/sda: UUID=“f01cbb7d-b011-c241-813f-aca4e4de038d” UUID_SUB=“abca515c-11a1-0903-aa66-6b0b69609fae” LABEL=“docker:0” TYPE=“linux_raid_member”
/dev/sdd: UUID=“f01cbb7d-b011-c241-813f-aca4e4de038d” UUID_SUB=“0f5d98f5-46e4-2f65-1ed5-828a35683dc3” LABEL=“docker:0” TYPE=“linux_raid_member”
/dev/sdc: UUID=“f01cbb7d-b011-c241-813f-aca4e4de038d” UUID_SUB=“c1766858-e767-6215-c91f-dd1adf255803” LABEL=“docker:0” TYPE=“linux_raid_member”