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Date:	Fri, 22 Apr 2011 10:53:37 +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 10:44 AM, Keith Mannthey wrote:
> 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. 
ok...
So please check whether your device supports discard or not.
Intel has a tool named Intel SSD Toolbox, and it can check the status of
your ssd, but the bad thing is that it seems to only have a windows
version...

Regards,
Tao
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