From mboxrd@z Thu Jan 1 00:00:00 1970 From: Theodore Tso Subject: Re: Ext4 on SSD Intel X25-M Date: Mon, 16 Nov 2009 13:40:03 -0500 Message-ID: <20091116184003.GA12268@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> <4B0076AD.9020008@diamondcut.com.br> <20091115221146.GH4323@mit.edu> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Cc: linux-ext4@vger.kernel.org, Eric Sandeen , Florian Weimer To: "Renato S. Yamane" Return-path: Received: from thunk.org ([69.25.196.29]:33077 "EHLO thunker.thunk.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752181AbZKPSkF (ORCPT ); Mon, 16 Nov 2009 13:40:05 -0500 Content-Disposition: inline In-Reply-To: <20091115221146.GH4323@mit.edu> Sender: linux-ext4-owner@vger.kernel.org List-ID: On Sun, Nov 15, 2009 at 05:11:46PM -0500, Theodore Tso wrote: > 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. I just did a default Ubuntu Karmic x86_64 install, and it writes a approximately ten and a half GB to the root partition. It also (for no explicable reason) apparently zero's out the swap partition, which (a) takes a long time, and (b) results in useless, pointless writes to the SSD. Someone should complain to Ubuntu about that... the workaround is to not configure swap during the Ubuntu install process, and to manually configure it yourself later. (Or to not use swap at all, if you have enough memory in your system.) In any case, given that means that only 8.5GB worth of data was written to your system, so over 30 days, your usage levels is averaging to 0.283 GB per calendar day. - Ted