From: Theodore Tso Subject: Re: Ext4 on SSD Intel X25-M Date: Sun, 15 Nov 2009 17:01:44 -0500 Message-ID: <20091115220144.GG4323@mit.edu> References: <4AFC14D6.7080700@diamondcut.com.br> <20091112153017.GA32122@mit.edu> <878wea84lq.fsf@mid.deneb.enyo.de> <4B006F8A.8000606@diamondcut.com.br> <878we7v651.fsf@mid.deneb.enyo.de> <4B00730F.5060503@redhat.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Cc: Florian Weimer , "Renato S. Yamane" , linux-ext4@vger.kernel.org To: Eric Sandeen Return-path: Received: from THUNK.ORG ([69.25.196.29]:53779 "EHLO thunker.thunk.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751404AbZKOWBr (ORCPT ); Sun, 15 Nov 2009 17:01:47 -0500 Content-Disposition: inline In-Reply-To: <4B00730F.5060503@redhat.com> Sender: linux-ext4-owner@vger.kernel.org List-ID: 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