From mboxrd@z Thu Jan 1 00:00:00 1970 From: David Casier AEVOO Subject: [Documentation] Hardware recommandation : RAM and PGLog Date: Sun, 19 Jul 2015 18:07:37 +0200 Message-ID: <55ABCB49.1080304@aevoo.fr> References: <55ABC8E5.1030304@aevoo.fr> Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 7bit Return-path: Received: from 62-210-192-203.rev.poneytelecom.eu ([62.210.192.203]:41925 "EHLO aevoo.fr" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753212AbbGSQId (ORCPT ); Sun, 19 Jul 2015 12:08:33 -0400 Received: from [192.168.1.97] (84.197.151.77.rev.sfr.net [77.151.197.84]) by aevoo.fr (Postfix) with ESMTPSA id 0DD75401EC for ; Sun, 19 Jul 2015 18:08:32 +0200 (CEST) In-Reply-To: <55ABC8E5.1030304@aevoo.fr> Sender: ceph-devel-owner@vger.kernel.org List-ID: To: ceph-devel@vger.kernel.org Hi, I have a question about PGLog and RAM consumption. In the documentation, we read "OSDs do not require as much RAM for regular operations (e.g., 500MB of RAM per daemon instance); however, during recovery they need significantly more RAM (e.g., ~1GB per 1TB of storage per daemon)" But in fact, all pg log are read in the start of ceph-osd daemon and put in RAM ( pg->read_state(store, bl); ) Is this normal behavior or I have a defect in my environment? Cordialement, David Casier.