From: Keith Mannthey Subject: Re: Quick EXT4 discard question Date: Thu, 21 Apr 2011 19:44:54 -0700 Message-ID: <1303440294.1389.136.camel@keith-laptop> References: <1303433101.1389.132.camel@keith-laptop> <4DB0E7AA.6070007@tao.ma> Mime-Version: 1.0 Content-Type: text/plain Content-Transfer-Encoding: 7bit Cc: linux-ext4@vger.kernel.org To: Tao Ma Return-path: Received: from e1.ny.us.ibm.com ([32.97.182.141]:53893 "EHLO e1.ny.us.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753421Ab1DVCo4 (ORCPT ); Thu, 21 Apr 2011 22:44:56 -0400 Received: from d01relay06.pok.ibm.com (d01relay06.pok.ibm.com [9.56.227.116]) by e1.ny.us.ibm.com (8.14.4/8.13.1) with ESMTP id p3M2YE01026811 for ; Thu, 21 Apr 2011 22:34:14 -0400 Received: from d01av04.pok.ibm.com (d01av04.pok.ibm.com [9.56.224.64]) by d01relay06.pok.ibm.com (8.13.8/8.13.8/NCO v10.0) with ESMTP id p3M2isNx553200 for ; Thu, 21 Apr 2011 22:44:55 -0400 Received: from d01av04.pok.ibm.com (loopback [127.0.0.1]) by d01av04.pok.ibm.com (8.14.4/8.13.1/NCO v10.0 AVout) with ESMTP id p3M2isYS025773 for ; Thu, 21 Apr 2011 22:44:54 -0400 In-Reply-To: <4DB0E7AA.6070007@tao.ma> Sender: linux-ext4-owner@vger.kernel.org List-ID: On Fri, 2011-04-22 at 10:27 +0800, Tao Ma wrote: > On 04/22/2011 08:45 AM, Keith Mannthey wrote: > > Hello, > > I am using some Intel SSD drives with 2.6.38.2. > > > > > > /proc/scsi/scsi identifies them as: > > > > " > > Host: scsi4 Channel: 00 Id: 04 Lun: 00 > > Vendor: ATA Model: INTEL SSDSA2M080 Rev: 02M3 > > Type: Direct-Access ANSI SCSI revision: 05 > > " > > > > Sometimes I am see the following messages that indicate discard is > > disabled during runtime: > > > > Relevant dmesg: > > > > ... > > EXT4-fs (sdw): mounted filesystem with ordered data mode. Opts: nobarrier,discard > > EXT4...... > > > > .... (some time later) > > > > EXT4-fs warning (device sdw): release_blocks_on_commit:2672: discard not supported, disabling > > EXT4-fs warning (device sds): release_blocks_on_commit:2672: discard not supported, disabling > > EXT4-fs warning (device sdt): release_blocks_on_commit:2672: discard not supported, disabling > > EXT4-fs warning (device sdu): release_blocks_on_commit:2672: discard not supported, disabling > > EXT4-fs warning (device sdv): release_blocks_on_commit:2672: discard not supported, disabling > Please check whether your ssd works with discard or whether your ssd > firmware has the ability to do so. > I used an SSDSA2M160(I guess you are using the same type as me except > the volume size is 80g, but you have to find it out from intel side) and > after I upgraded my firmware to the new version(you can download it from > intel site), it supports discard now. Firmware is up to date as of a few weeks ago. It is 02M3 which still looks to be the current version. Thanks, Keith