From: "Renato S. Yamane" Subject: Re: Ext4 on SSD Intel X25-M Date: Sun, 15 Nov 2009 19:15:54 -0200 Message-ID: <4B006F8A.8000606@diamondcut.com.br> References: <4AFC14D6.7080700@diamondcut.com.br> <20091112153017.GA32122@mit.edu> <878wea84lq.fsf@mid.deneb.enyo.de> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Cc: Florian Weimer , Theodore Tso To: linux-ext4@vger.kernel.org Return-path: Received: from smtp-04.mandic.com.br ([200.225.81.151]:35666 "EHLO smtp-04.mandic.com.br" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751300AbZKOVPq (ORCPT ); Sun, 15 Nov 2009 16:15:46 -0500 Received: from 189.114.151.225.dynamic.adsl.gvt.net.br (HELO [192.168.1.104]) (4s3fxNW2pdTI28e3yZjKop5Ok6I=@[189.114.151.225]) (envelope-sender ) by smtp-04.mandic.com.br (qmail-ldap-1.03) with AES256-SHA encrypted SMTP for ; 15 Nov 2009 21:15:48 -0000 In-Reply-To: <878wea84lq.fsf@mid.deneb.enyo.de> Sender: linux-ext4-owner@vger.kernel.org List-ID: 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