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

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Message-ID: <4B006F8A.8000606@diamondcut.com.br>
Date:	Sun, 15 Nov 2009 19:15:54 -0200
From:	"Renato S. Yamane" <yamane@...mondcut.com.br>
To:	linux-ext4@...r.kernel.org
CC:	Florian Weimer <fw@...eb.enyo.de>, Theodore Tso <tytso@....edu>
Subject: Re: Ext4 on SSD Intel X25-M

On 13-11-2009 20:03, Florian Weimer wrote:
> * Theodore Tso:
>> That being said, though, it shouldn't be necessary to avoid using a
>> journal on the Intel SSD.  Intel says that laptop will last at least 5
>> years with 10GB worth of writes per day, and that's a huge amount.  I
>> have an X25-M SSD in my laptop, using an ext4 file system and with the
>> journal enabled, and since the file system was created 266 days ago,
>> when I put my X25-M into service, the drive has seen 570GB worth of
>> writes, so I'm averaging 2.14 GB writes per day.
>
> That really depends on the software you use.  Just fetching mail on my
> machine causes about 500 MB of data written to disk.  That's because
> I'm using Gnus with nnml and slightly large mail folders and Gnus
> rewrites those index files from scratch each time new mail for a
> folder arrives.  I should really consider this a bug and fix it, but I
> haven't yet found a good solution.

So sorry for this stupid question, but...
How can I know the average writes per day?
I try run smart, but it not help me:

ID# ATTRIBUTE_NAME          FLAG     VALUE WORST THRESH TYPE 
UPDATED  WHEN_FAILED RAW_VALUE
   3 Spin_Up_Time            0x0000   100   000   000    Old_age 
Offline      -       0
   4 Start_Stop_Count        0x0000   100   000   000    Old_age 
Offline      -       0
   5 Reallocated_Sector_Ct   0x0002   100   100   000    Old_age 
Always       -       0
   9 Power_On_Hours          0x0002   100   100   000    Old_age 
Always       -       229
  12 Power_Cycle_Count       0x0002   100   100   000    Old_age 
Always       -       62
192 Power-Off_Retract_Count 0x0002   100   100   000    Old_age   Always 
       -       48
232 Unknown_Attribute       0x0003   100   100   010    Pre-fail  Always 
       -       0
233 Unknown_Attribute       0x0002   099   099   000    Old_age   Always 
       -       0
225 Load_Cycle_Count        0x0000   200   200   000    Old_age 
Offline      -       44867
226 Load-in_Time            0x0002   255   000   000    Old_age   Always 
       -       0
227 Torq-amp_Count          0x0002   000   000   000    Old_age   Always 
       -       0
228 Power-off_Retract_Count 0x0002   000   000   000    Old_age   Always 
       -       0

Reagards,
Renato S. Yamane
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