From mboxrd@z Thu Jan 1 00:00:00 1970 From: devzero@web.de Subject: Re: Re: device mapper integrated loops - and one more year ! Date: Sat, 20 Jan 2007 15:57:23 +0100 Message-ID: <1572893983@web.de> Reply-To: device-mapper development Mime-Version: 1.0 Content-Type: text/plain; charset=iso-8859-15 Content-Transfer-Encoding: quoted-printable Return-path: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: dm-devel-bounces@redhat.com Errors-To: dm-devel-bounces@redhat.com To: breeves@redhat.com Cc: dm-devel@redhat.com List-Id: dm-devel.ids Hello Bryn,=20 >I'll see if we can get a revised version of the current patch for wider >testing in the next couple of weeks - let me know if you would be >interested in trying this out. not sure if i sent a reply to this or have missed this - but, yes - i`m = still interested very much in using dm-loop ! is there anything new with this? do i have to expect issues with files >2gb ? (i need to loopback mount dv= d iso-images) is there a download url for the latest dm-loop patch so i can do some tes= ts and report feedback ? i couldn`t find it at http://sources.redhat.com/cgi-bin/cvsweb.cgi/device= -mapper/?cvsroot=3Ddm and i`m not sure if i should take that one from ht= tp://kernel.org/pub/linux/kernel/people/agk/patches/2.6/ TIA roland > Hello ! >=20 > after desparately seeking for a solution to have more than 256 loop > devices (for a huge cd-rom server), i have recently come across > dm-loop, which looks very promising (to replace loop.c) >=20 > can i have more than 256 devices which this? Hi Roland, Yes, dm-loop will support as many loop devices as device-mapper can allow= . > our cd-rom server is going to have more than 256 iso-images soon and > i need to upgrade to a more recent OS, anyway, so this won`t be a=20 > problem that dm-loop is so brand new. >=20 > but - any timeline for dm-loop mainline inclusion ? >=20 > should i wait for 2.6.19 or 2.6.20 ? There isn't a fixed timeline. We are currently working to improve the lookup code - the prototype patch uses a linear search which doesn't scale well for large/fragmented image files. I have some tests running at the moment and we hope to have something soon - the results so far are good, it's just a case of selecting between a couple of different methods. The changes dm-loop requires in device-mapper core are pretty minor and have already been merged in 2.6.19, so it's just the dm-loop patch itself remaining. > is it already useable with less recent kernels, i.e. can i download > dm-loop patch and recent dmsetup tool and use with older kernel ? This should work fine - there are a couple of known issues with the existing patch, but unless you are using large images (>2G), or have a severely fragmented filesystem you shouldn't run into these. I'll see if we can get a revised version of the current patch for wider testing in the next couple of weeks - let me know if you would be interested in trying this out. Thanks, Bryn. _________________________________________________________________________= _ Erweitern Sie FreeMail zu einem noch leistungsst=E4rkeren E-Mail-Postfach= ! =09 Mehr Infos unter http://freemail.web.de/home/landingpad/?mc=3D021131