Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751739Ab0FZFSO (ORCPT ); Sat, 26 Jun 2010 01:18:14 -0400 Received: from isrv.corpit.ru ([81.13.33.159]:36343 "EHLO isrv.corpit.ru" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751093Ab0FZFSN (ORCPT ); Sat, 26 Jun 2010 01:18:13 -0400 Message-ID: <4C258D91.6010308@msgid.tls.msk.ru> Date: Sat, 26 Jun 2010 09:18:09 +0400 From: Michael Tokarev Organization: Telecom Service, JSC User-Agent: Mozilla/5.0 (X11; U; Linux i686 (x86_64); en-US; rv:1.9.1.9) Gecko/20100515 Icedove/3.0.4 MIME-Version: 1.0 To: Ric Wheeler CC: Daniel Taylor , Mike Fedyk , Daniel J Blueman , Mat , LKML , linux-fsdevel@vger.kernel.org, Chris Mason , Andrew Morton , Linus Torvalds , The development of BTRFS Subject: Re: Btrfs: broken file system design (was Unbound(?) internal fragmentation in Btrfs) References: <4C07C321.8010000@redhat.com><4C1B7560.1000806@gmail.com><4C1BA3E5.7020400@gmail.com><20100623234031.GF7058@shareable.org><469D2D911E4BF043BFC8AD32E8E30F5B24AEBA@wdscexbe07.sc.wdc.com> <469D2D911E4BF043BFC8AD32E8E30F5B24AEBB@wdscexbe07.sc.wdc.com> <4C24FC71.6020001@redhat.com> In-Reply-To: <4C24FC71.6020001@redhat.com> X-Enigmail-Version: 1.0.1 OpenPGP: id=804465C5 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1467 Lines: 34 25.06.2010 22:58, Ric Wheeler wrote: > On 06/24/2010 06:06 PM, Daniel Taylor wrote: [] >>> On Wed, Jun 23, 2010 at 8:43 PM, Daniel Taylor >>> wrote: >>> >>>> Just an FYI reminder. The original test (2K files) is utterly >>>> pathological for disk drives with 4K physical sectors, such as >>>> those now shipping from WD, Seagate, and others. Some of the >>>> SSDs have larger (16K0 or smaller blocks (2K). There is also >>>> the issue of btrfs over RAID (which I know is not entirely >>>> sensible, but which will happen). Why it is not sensible to use btrfs on raid devices? Nowadays raid is just everywhere, from 'fakeraid' on AHCI to large external arrays on iSCSI-attached storage. Sometimes it is nearly imposisble to _not_ use RAID, -- many servers comes with a built-in RAID card which can't be turned off or disabled. And hardware raid is faster (at least in theory) at least because it puts less load on various system busses. To many "enterprise folks" a statement "we don't need hw raid, we have better solution" sounds like "we're just a toy, don't use". Hmm? ;) /mjt, who always used and preferred _software_ raid due to multiple reasons, and never used btrfs so far. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/