From mboxrd@z Thu Jan 1 00:00:00 1970 From: Wido den Hollander Subject: Re: Switch to RBD format 2 by default after Firefly Date: Tue, 08 Apr 2014 14:57:45 +0200 Message-ID: <5343F249.5010200@42on.com> References: <5343EFF4.9010808@42on.com> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Return-path: Received: from websrv.42on.com ([31.25.102.167]:56191 "EHLO websrv.42on.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756369AbaDHM5s (ORCPT ); Tue, 8 Apr 2014 08:57:48 -0400 In-Reply-To: Sender: ceph-devel-owner@vger.kernel.org List-ID: To: Ilya Dryomov Cc: ceph-devel On 04/08/2014 02:56 PM, Ilya Dryomov wrote: > On Tue, Apr 8, 2014 at 4:47 PM, Wido den Hollander wrote: >> Hi, >> >> With Ubuntu 14.04 now shipping with the 3.13 kernel it fully supports Format >> 2 in both librbd and krbd. >> >> For RHEL 7 there will be a extra yum repo with a module which supports >> format 2, so isn't it that that after Firefly we change 'rbd_default_format' >> to 2? >> >> I still see a lot of images being created with format 1 and that will >> otherwise be hunting us for a long time. >> >> I'd vote for making format 2 the default or at least patch the 'rbd' tool to >> create format 2 images. > > Fancy format 2 striping is not supported by krbd. We've had a couple > people who confused format 2 support with the ability to set their own > stripe settings, so we'll need to be more vocal about it. Ah, that's something I've missed. Never used that in combination with krbd. So yes, we need to be more vocal about that. Maybe even set a warning in the 'rbd' cli tool? Or at least in the help/usage. > > Thanks, > > Ilya > -- Wido den Hollander 42on B.V. Phone: +31 (0)20 700 9902 Skype: contact42on