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From: Michael Brancato <mike@mikebrancato.com>
To: linux-raid@vger.kernel.org
Subject: status of raid 4/5 disk reduce
Date: Mon, 08 Dec 2008 15:59:01 -0500	[thread overview]
Message-ID: <493D8A95.2020700@mikebrancato.com> (raw)

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

             reply	other threads:[~2008-12-08 20:59 UTC|newest]

Thread overview: 19+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2008-12-08 20:59 Michael Brancato [this message]
2008-12-09 21:11 ` status of raid 4/5 disk reduce Alex Lilley
2008-12-09 21:33   ` David Lethe
2008-12-09 21:51     ` Robin Hill
2008-12-09 23:15       ` Ryan Wagoner
2008-12-10 12:14         ` Alex Lilley
2008-12-11  0:07           ` Michael Brancato
2008-12-11  4:30             ` David Lethe
2008-12-11  6:33               ` Michael Brancato
2008-12-11 13:52                 ` Louis-David Mitterrand
2008-12-11 15:13                   ` Michael Brancato
2008-12-11 11:43               ` John Robinson
2008-12-11 14:46                 ` Mikael Abrahamsson
2008-12-11 15:24                   ` David Lethe
2008-12-11 16:13                     ` Michael Brancato
2008-12-11 15:27                   ` Michael Brancato
2008-12-11 11:51               ` Alex Lilley
2008-12-15 23:18 ` Neil Brown
  -- strict thread matches above, loose matches on Subject: below --
2008-12-12 15:38 David Lethe

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