From mboxrd@z Thu Jan 1 00:00:00 1970 From: Keith Owens Subject: Re: Thin provisioning & arrays Date: Tue, 11 Nov 2008 13:09:38 +1100 Message-ID: <28572.1226369378@ocs10w> References: <9FA859626025B64FBC2AF149D97C944A8A64B5@CORPUSMX80A.corp.emc.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Cc: david@fromorbit.com, dwmw2@infradead.org, martin.petersen@oracle.com, chris.mason@oracle.com, jens.axboe@oracle.com, James.Bottomley@hansenpartnership.com, rwheeler@redhat.com, linux-scsi@vger.kernel.org, linux-fsdevel@vger.kernel.org, coughlan@redhat.com, matthew@wil.cx To: Black_David@emc.com Return-path: Received: from mail.ocs.com.au ([202.134.241.204]:14960 "EHLO mail.ocs.com.au" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753163AbYKKCVo (ORCPT ); Mon, 10 Nov 2008 21:21:44 -0500 In-reply-to: Your message of "Mon, 10 Nov 2008 20:23:17 CDT." <9FA859626025B64FBC2AF149D97C944A8A64B5@CORPUSMX80A.corp.emc.com> Sender: linux-fsdevel-owner@vger.kernel.org List-ID: On Mon, 10 Nov 2008 20:23:17 -0500, Black_David@emc.com wrote: >Dave, >The thin provisioning chunk size (coming) in the VPD page is a >possible place to start. VPD page for which device? Consider a filesystem that is striped across devices from multiple arrays or even multiple vendors. How is the filesystem supposed to "align" an unmap command when the underlying disks all have different alignments?