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Date:	Thu, 21 Apr 2011 19:44:54 -0700
From:	Keith Mannthey <kmannth@...ibm.com>
To:	Tao Ma <tm@....ma>
Cc:	linux-ext4@...r.kernel.org
Subject: Re: Quick EXT4 discard question

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 

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