linux-ext4 - Re: Ext4 on SSD Intel X25-M

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Message-ID: <20091115220144.GG4323@mit.edu>
Date:	Sun, 15 Nov 2009 17:01:44 -0500
From:	Theodore Tso <tytso@....edu>
To:	Eric Sandeen <sandeen@...hat.com>
Cc:	Florian Weimer <fw@...eb.enyo.de>,
	"Renato S. Yamane" <yamane@...mondcut.com.br>,
	linux-ext4@...r.kernel.org
Subject: Re: Ext4 on SSD Intel X25-M

On Sun, Nov 15, 2009 at 03:30:55PM -0600, Eric Sandeen wrote:
> Florian Weimer wrote:
>> * Renato S. Yamane:
>>
>>> How can I know the average writes per day?
>>
>> I used iostat (part of sysstat).  Perhaps I should have checked first
>> if it is accurate. 8-/
>
> If you're running ext4, you can look at:
>
> /sys/fs/ext4/sdXX/lifetime_write_kbytes and
> /sys/fs/ext4/sdXX/session_write_kbytes

For an umounted filesystem, you can also do this:

dumpe2fs -h /dev/XXX | grep "Lifetime writes"
dumpe2fs -h /dev/XXX | grep "Filesystem created"

Then use a handy-dandy date calculator to figure the number of days
between the file system creation date and today, and then divide...

	    	 		      - Ted
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