From mboxrd@z Thu Jan 1 00:00:00 1970 From: Tomasz Chmielewski Subject: Re: ceph, slow (cheap) and fast (expensive) storage? Date: Wed, 09 Jun 2010 16:55:34 +0200 Message-ID: <4C0FAB66.6030003@wpkg.org> References: <4C0E1BAC.8070306@wpkg.org> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Return-path: Received: from mail.virtall.com ([178.63.195.102]:36054 "EHLO mail.virtall.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755892Ab0FIOzn (ORCPT ); Wed, 9 Jun 2010 10:55:43 -0400 In-Reply-To: Sender: ceph-devel-owner@vger.kernel.org List-ID: To: Sage Weil Cc: ceph-devel@vger.kernel.org Am 08.06.2010 19:51, Sage Weil wrote: > On Tue, 8 Jun 2010, Tomasz Chmielewski wrote: >> I'd like to build a cluster for storing large amounts of data. >> >> The cluster would consist of slow (cheap) storage and fast (expensive) >> storage. >> >> I would like to migrate data from fast (expensive) storage to slow (cheap) >> storage if it wasn't accessed for, say, 6 months. >> >> Would ceph somehow help me achieve that? > > We don't currently have that functionality. In principle it's certainly > something the system could do, and the underlying storage architecture > lends itself to that: Hmm, since quite recently, Linux kernel has FS-Cache, which: This facility is a general purpose cache for network filesystems, though it could be used for caching other things such as ISO9660 filesystems too. I wonder if it could work with ceph and/or traditional filesystems, too? -- Tomasz Chmielewski http://wpkg.org