From mboxrd@z Thu Jan 1 00:00:00 1970 From: Chris Dunlop Subject: Re: Speed up 'rbd rm' Date: Fri, 31 May 2013 11:40:49 +1000 Message-ID: <20130531014049.GA424@onthe.net.au> References: <20130529055942.GA3977@onthe.net.au> <51A65523.10107@inktank.com> <20130530022307.GA27809@onthe.net.au> <51A7BB86.3020106@inktank.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: Received: from smtp1.onthe.net.au ([203.22.196.249]:39929 "EHLO smtp1.onthe.net.au" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751210Ab3EaBpO (ORCPT ); Thu, 30 May 2013 21:45:14 -0400 Content-Disposition: inline In-Reply-To: <51A7BB86.3020106@inktank.com> Sender: ceph-devel-owner@vger.kernel.org List-ID: To: Josh Durgin Cc: ceph-devel@vger.kernel.org On Thu, May 30, 2013 at 01:50:14PM -0700, Josh Durgin wrote: > On 05/29/2013 07:23 PM, Chris Dunlop wrote: >> On Wed, May 29, 2013 at 12:21:07PM -0700, Josh Durgin wrote: >>> On 05/28/2013 10:59 PM, Chris Dunlop wrote: >>>> I see there's a new commit to speed up an 'rbd rm': >>>> >>>> http://tracker.ceph.com/projects/ceph/repository/revisions/40956410169709c32a282d9b872cb5f618a48926 >>>> >>>> Is it safe to cherry-pick this commit on top of 0.56.6 (or, if not, v0.61.2) to speed up the remove? >>> >>> You'll need 537386d906b8c0e395433461dcb03a82eb33f34f as well. It should >>> apply cleanly to 0.61.2, and probably 0.56.6 too. >> >> Thanks. I'll see how I go, I may just leave the 'rm' running all >> weekend rather than futzing around recompiling ceph and getting >> off the mainline track. > > If you're mainly interested in getting rid of the accidentally 1.5PB > image, you can just delete the header (and id object if it's format 2) > and then 'rbd rm' will just remove it from the rbd_directory index, and > not try to delete all the non-existent data objects. Yes, that's my main interest. Sorry, I haven't yet delved far into the details of how the rbd stuff hangs together: can you give me a hint or point me towards any docs regarding what "delete the header (and id object" would look like? Cheers, Chris.