From mboxrd@z Thu Jan 1 00:00:00 1970 From: Neil Brown Subject: Re: Changing chunk size Date: Fri, 16 Feb 2007 10:24:43 +1100 Message-ID: <17876.60347.983953.748979@notabene.brown> References: <45D4955C.60008@tmr.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: message from Bill Davidsen on Thursday February 15 Sender: linux-raid-owner@vger.kernel.org To: Bill Davidsen Cc: Linux RAID List-Id: linux-raid.ids On Thursday February 15, davidsen@tmr.com wrote: > I have determined that a large array was created with an overly-large > chunk size. Best way to resize? Dump and restore. in-place reshapes (such as raid5 + 1 disk => raid6 or change-chunk-size) are on my list of 'that might be interesting to implement', but there are plenty of more interesting things. And it would be very slow. It would need to copy some number of stripes to a backup somewhere, then copy them back in the new layout, so every block in the array would be written twice. NeilBrown