From: Ric Wheeler Subject: Re: [PATCH][RFC] resize2fs and uninit_bg questions Date: Fri, 18 Sep 2009 07:43:04 -0400 Message-ID: <4AB37248.4050309@redhat.com> References: <20090916162457.GA84213@freezingfog.local> <20090916190831.GH2537@webber.adilger.int> <20090916204225.GB84213@freezingfog.local> <20090916212250.GL2537@webber.adilger.int> <20090916231131.GC84213@freezingfog.local> <4AB28DD5.30607@redhat.com> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Cc: Will Drewry , Andreas Dilger , linux-ext4@vger.kernel.org To: "Martin K. Petersen" Return-path: Received: from mx1.redhat.com ([209.132.183.28]:29806 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756757AbZIRLmw (ORCPT ); Fri, 18 Sep 2009 07:42:52 -0400 In-Reply-To: Sender: linux-ext4-owner@vger.kernel.org List-ID: On 09/18/2009 02:09 AM, Martin K. Petersen wrote: >>>>>> "Ric" == Ric Wheeler writes: >>>>>> > Ric> One note - the WRITE_SAME command in SCSI has long been used by > Ric> array vendors to do relatively high performance zero fills. > > I've been working on WRITE SAME and UNMAP support recently (layering on > top of Christoph's patch kit). It might be worthwhile to expose the > WRITE SAME functionality further up the stack. It could also be helpful > for initializing RAID disks, for instance... > > Using it to initialize RAID disks is exactly what it is there for - that sounds quite useful... ric