From mboxrd@z Thu Jan 1 00:00:00 1970 From: Stefan Priebe Subject: Re: Questions about journals, performance and disk utilization. Date: Tue, 22 Jan 2013 22:50:04 +0100 Message-ID: <50FF098C.8050707@profihost.ag> References: <58f5e24e5ac1a7bfff8fc6b90719ec75@skytech.dk> <50FF0197.6020202@inktank.com> <50FF0410.3030308@gmail.com> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Return-path: Received: from mail-ph.de-nserver.de ([85.158.179.214]:46596 "EHLO mail-ph.de-nserver.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751513Ab3AVVuG (ORCPT ); Tue, 22 Jan 2013 16:50:06 -0500 In-Reply-To: <50FF0410.3030308@gmail.com> Sender: ceph-devel-owner@vger.kernel.org List-ID: To: Jeff Mitchell Cc: Mark Nelson , martin , "ceph-devel@vger.kernel.org" Hi, Am 22.01.2013 22:26, schrieb Jeff Mitchell: > Mark Nelson wrote: >> It may (or may not) help to use a power-of-2 number of PGs. It's >> generally a good idea to do this anyway, so if you haven't set up your >> production cluster yet, you may want to play around with this. Basically >> just take whatever number you were planning on using and round it up (or >> down slightly). IE if you were going to use 7,000 PGs, round up to 8192. > > As I was asking about earlier on IRC, I'm in a situation where the docs > did not mention this in the section about calculating PGs so I have a > non-power-of-2 -- and since there are some production things running on > that pool I can't currently change it. Oh same thing here - did i miss the doc or can someone point me the location. Is there a chance to change the number of PGs for a pool? Greets, Stefan