I am unable to erase an unwanted RAID 1 array. Command cat /proc/mdstat
reported
md4 : active raid1 sdb7[0]
20970368 blocks super 1.0 [2/1] [U_]
bitmap: 1/1 pages [4KB], 65536KB chunk
I understand that the array has to be inactive before it can be removed, so I
stopped it, but was not able to remove the array
root@titan ~ umount /dev/md4
root@titan ~ mdadm --misc /dev/md4 --stop
root@titan ~ mdadm --manage /dev/md4 --remove /dev/sdb7
mdadm: hot remove failed for /dev/sdb7: Device or resource busy
The command ps -ef | grep md4 reports
root 211 2 0 Jan09 ? 00:00:00 [md4_raid1]
I assume process 211 is keeping md4 busy. Do I have to kill process 211 or is
there some more elegant way? Or is it mdadm itself in process 663 which is
keeping md4 busy?
root 663 1 0 Jan09 ? 00:00:00 /sbin/mdadm --monitor --scan
The documentation I have found shows lots of examples of building RAID 1
arrays,
but not removing them. The program mdadm does not have a --disassemble mode.
Any suggestion would be much appreciated.
Roger
