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Date:	Fri, 22 Apr 2011 10:27:54 +0800
From:	Tao Ma <tm@....ma>
To:	Keith Mannthey <kmannth@...ibm.com>
CC:	linux-ext4@...r.kernel.org
Subject: Re: Quick EXT4 discard question

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.

Regards,
Tao
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