From mboxrd@z Thu Jan 1 00:00:00 1970 From: Luca Berra Subject: Re: Bitmaps & Kernel Versions Date: Thu, 16 Mar 2006 00:43:33 +0100 Message-ID: <20060315234333.GC25405@percy.comedia.it> References: <4417DA8B.3040306@unix-scripts.info> <17431.59281.909724.299333@cse.unsw.edu.au> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii; format=flowed Return-path: Content-Disposition: inline In-Reply-To: <17431.59281.909724.299333@cse.unsw.edu.au> Sender: linux-raid-owner@vger.kernel.org To: linux-raid@vger.kernel.org List-Id: linux-raid.ids On Wed, Mar 15, 2006 at 09:08:17PM +1100, Neil Brown wrote: >On Wednesday March 15, lcaron@unix-scripts.info wrote: >> Hi, >> >> I'm planning to use bitmaps on some of our RAID1 arrays. >> >> I'm wondering how bitmaps are handeled by older kernels. >> >> Eg: I create a raid array with a bitmap under a 2.6.15 kernel. >> >> I now want to boot under 2.6.12, or even 2.4 >> >> >> Hos is it handeled? >> Will it work even if this is my / partition? > >On older kernel will not notice the bitmap and will behave >'normally'. > strange, last time i tried an older kernel would refuse to activate an md with a bitmap on it. I am far from home on a business trip and i don't have kernel-sources at hand, but i seem to remember that the kernel was very strict on the feature bitmap in the superblock. L. -- Luca Berra -- bluca@comedia.it Communication Media & Services S.r.l. /"\ \ / ASCII RIBBON CAMPAIGN X AGAINST HTML MAIL / \