From mboxrd@z Thu Jan 1 00:00:00 1970 From: Michael Brancato Subject: Re: status of raid 4/5 disk reduce Date: Thu, 11 Dec 2008 01:33:51 -0500 Message-ID: <4940B44F.9000000@mikebrancato.com> References: <493D8A95.2020700@mikebrancato.com> <493EDF02.5090500@redwax.co.uk> <20081209215149.GA21523@cthulhu.home.robinhill.me.uk> <7d86ddb90812091515m1e0ee2f9w95a86ca2b56a98fe@mail.gmail.com> <493FB2AC.7000902@redwax.co.uk> <494059A4.8050702@mikebrancato.com> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: Sender: linux-raid-owner@vger.kernel.org To: David Lethe Cc: Alex Lilley , linux-raid@vger.kernel.org List-Id: linux-raid.ids David Lethe wrote: > > Respectfully, go bother the LVM, jfs, ext, afs, and all the other file > system people. You have zero chance of getting them on board to support > online file system shrinking without any guarantee of scratch space. > My advice is that you don't tell them you also want them to resize while > the md volume is being resized, and also don't tell them that the array > might be degraded. I didn't bring up nor argued the filesystem online resize issue, you did. Why does the filesystem have to be online during the reshape or the shrink? People shrink filesystems and partitions while offline everyday, and the sun still rises. Filesystem support for reshaping (not resizing) should be a non-issue. Resizing shrink exists today. > If you want to copy 4x120 into 3x500 ... mount all the disks and COPY > the data. If you are truly limited to 4 disks, and are too cheap to > spend $10-20 for another controller, after buying 1.5TB worth of disk > drives, then you really need to get your priorities in order. Words fail me.... Why support reshaping RAID arrays by adding disks then if we should just go buy more disks and create a new array to copy the data to? I don't know why you oppose the flexibility of reshape shrinking, but at one point it was planned. I simply tried to see what the status was of the development and what was needed to get support for reshape shrink. When it comes to actually using it, to each his own.