linux-ext4 - Quick EXT4 discard question

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Date:	Thu, 21 Apr 2011 17:45:01 -0700
From:	Keith Mannthey <kmannth@...ibm.com>
To:	linux-ext4@...r.kernel.org
Subject: Quick EXT4 discard question

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

I am new to SSDs and discard is there something else I need to do to
make these drives work as expected? 


Thanks,
  Keith Mannthey 
  LTC Local Filesystem 

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