I'm curious as to the status of the ability to reduce the number of
disks in a RAID 4/5 array. I would like the ability to reshape a 4 disk
raid4/5 to a 3 disk raid4/5 for flexibility.
here is what I want to do....
$ sudo mdadm /dev/md0 --fail /dev/disk4 --remove /dev/disk4
mdadm: set /dev/disk4 faulty in /dev/md0
mdadm: hot removed /dev/disk4
$ sudo mdadm --grow /dev/md0 -n3
mdadm: /dev/md0: Cannot reduce number of data disks (yet).
I know this capability is missing in the md driver. What is needed to
make it work and is anyone currently working on it?
Regards,
--
Mike Brancato, CISSP
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