From mboxrd@z Thu Jan 1 00:00:00 1970 From: Ed Wilts Subject: Re: Device Mapper as a cache for SAN? Date: Mon, 10 Apr 2006 13:45:31 -0500 Message-ID: <20060410184531.GA12908@www.ewilts.org> References: Reply-To: device-mapper development Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: Content-Disposition: inline In-Reply-To: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: dm-devel-bounces@redhat.com Errors-To: dm-devel-bounces@redhat.com To: device-mapper development List-Id: dm-devel.ids On Mon, Apr 10, 2006 at 12:58:36PM -0500, Eric Van Hensbergen wrote: > It seems like device-mapper would allow a fairly straightforward > implementation of a local-disk cache for a SAN (iSCSI, AOE, etc.). > The dm-raid1 and dm-mpath modules seem to have elements of overlap, > but its not clear if there's a straightforward way to implement a > local-disk block cache using existing modules, or whether a new one is > needed. Has anyone looked at this before? The obvious question is why? What would this provide that the kernel and file systems don't already provide? .../Ed -- Ed Wilts, RHCE Mounds View, MN, USA mailto:ewilts@ewilts.org Member #1, Red Hat Community Ambassador Program