From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from plane.gmane.org ([80.91.229.3]:56906 "EHLO plane.gmane.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750776AbaFEIIO (ORCPT ); Thu, 5 Jun 2014 04:08:14 -0400 Received: from list by plane.gmane.org with local (Exim 4.69) (envelope-from ) id 1WsSib-0006sw-49 for linux-btrfs@vger.kernel.org; Thu, 05 Jun 2014 10:08:13 +0200 Received: from coffee.modeemi.fi ([130.230.72.140]) by main.gmane.org with esmtp (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Thu, 05 Jun 2014 10:08:13 +0200 Received: from flux-btrfs by coffee.modeemi.fi with local (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Thu, 05 Jun 2014 10:08:13 +0200 To: linux-btrfs@vger.kernel.org From: Erkki Seppala Subject: Re: Very slow filesystem Date: Thu, 05 Jun 2014 11:08:00 +0300 Message-ID: References: Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Sender: linux-btrfs-owner@vger.kernel.org List-ID: Igor M writes: > Why btrfs becames EXTREMELY slow after some time (months) of usage ? Have you tried iostat from sysstat to see the number of IO-operations performed per second (tps) on the devices when it is performing badly? If the number is hitting your seek rate (ie. 1/0.0075 for 7.5 ms seek = 133), then fragmentation is sure to be blamed. -- _____________________________________________________________________ / __// /__ ____ __ http://www.modeemi.fi/~flux/\ \ / /_ / // // /\ \/ / \ / /_/ /_/ \___/ /_/\_\@modeemi.fi \/