linux-ext4 - Re: Quick EXT4 discard question

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Date:	Fri, 22 Apr 2011 09:44:55 +0200 (CEST)
From:	Lukas Czerner <lczerner@...hat.com>
To:	Tao Ma <tm@....ma>
cc:	Keith Mannthey <kmannth@...ibm.com>, linux-ext4@...r.kernel.org
Subject: Re: Quick EXT4 discard question

On Fri, 22 Apr 2011, Tao Ma wrote:

> 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...

Actually you can query that with hdparm -I /path/to/the/device and you
should see something like

*   Data Set Management TRIM supported

in the output.

Thanks!
-Lukas

> 
> Regards,
> Tao
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