MacBook Air のレスポンスがなんとなく悪くなっているなあと感じた。

　確認したら Trim が無効になってました。
　Yosemite からサードパーティー製のドライブでも対応したコマンドが搭載されていたようで試してみた。

~ $ trimforce
Usage: trimforce enable
trimforce disable
trimforce help
~ $ sudo trimforce enable

WARNING: Improper use of the sudo command could lead to data loss
or the deletion of important system files. Please double-check your
typing when using sudo. Type "man sudo" for more information.

To proceed, enter your password, or type Ctrl-C to abort.

Password:
IMPORTANT NOTICE:  This tool force-enables TRIM for all relevant attached
devices, even though such devices may not have been validated for data
integrity while using TRIM.  Use of this tool to enable TRIM may result in
unintended data loss or data corruption.  It should not be used in a commercial
operating environment or with important data. Before using this tool, you
should back up all of your data and regularly back up data while TRIM is
enabled.  This tool is provided on an “as is” basis. APPLE MAKES NO WARRANTIES,
EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION THE IMPLIED WARRANTIES OF
NON-INFRINGEMENT, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE,
REGARDING THIS TOOL OR ITS USE ALONE OR IN COMBINATION WITH YOUR DEVICES,
SYSTEMS, OR SERVICES. BY USING THIS TOOL TO ENABLE TRIM, YOU AGREE THAT, TO THE
EXTENT PERMITTED BY APPLICABLE LAW, USE OF THE TOOL IS AT YOUR SOLE RISK AND
THAT THE ENTIRE RISK AS TO SATISFACTORY QUALITY, PERFORMANCE, ACCURACY AND
EFFORT IS WITH YOU.
Are you sure you wish to proceed (y/N)? y
Your system will immediately reboot when this is complete.
Is this OK (y/N)? y
Enabling TRIM...
.
.
Operation succeeded. Your system will reboot momentarily, please wait...

  [復元されました]
Last login: Mon Sep 28 08:01:41 on console
~ $ 

　コマンドの途中で再起動がかかるので注意。

　無事に有効になりました。

　これでなんとなく Mavericks 時代のスピードに戻ったような気がします。

　ちなみに使用している SSD は以下の製品です。