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

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Message-ID: <4B007E28.6050302@diamondcut.com.br>
Date:	Sun, 15 Nov 2009 20:18:16 -0200
From:	"Renato S. Yamane" <yamane@...mondcut.com.br>
To:	linux-ext4@...r.kernel.org
CC:	Theodore Tso <tytso@....edu>, Eric Sandeen <sandeen@...hat.com>,
	Florian Weimer <fw@...eb.enyo.de>
Subject: Re: Ext4 on SSD Intel X25-M

On 15-11-2009 20:11, Theodore Tso wrote:
> Renato S. Yamane wrote:
>> Eric Sandeen wrote:
>>> Florian Weimer wrote:
>>>> Renato S. Yamane wrote:
>>>>> 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
>>
>> smartctl show me 229h Power_On_Hours (I buy it one month ago).
>> And /sys/fs/ext4/sdXX/lifetime_write_kbytes show me 19940467
>>
>> So:
>> 229h = 9,54 days
>> 19940467 kbytes / 9,54 days = 2Gb/day
>>
>> I think that it is too much. I use it on my laptop only to see my
>> e-mails (Thunderbird) and use OpenOffice.org on my work environment.
>
> If you've only had the disk for a short while, then the initial writes
> to install your system is probably biasing your results.  So far you
> have approximately 19GB of disk writes.  I'm guessing that at least
> 3-4GB is from the initial installation of software on your system.
>
> Also, if you are turning off your laptop at night, treating 229 hours
> as 9.5 days isn't really fair.  If you installed the SSD a month ago,
> then treat that as 30 days, and we get:
>
>       16GB / 30 == 0.533 GB
>
> This is well under the rated 20GB/day upon which Intel guarantees a
> five year life --- and most people don't keep their laptop and/or hard
> drives that long anyway.

Wow! You are really right!
Thank you so much Theodore, Eric and Florian!
I'm very happy with this SSD! It's really faster!

Regards,
Renato S. Yamane
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