From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from syrinx.knorrie.org ([82.94.188.77]:47196 "EHLO syrinx.knorrie.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1427090AbdDVVSp (ORCPT ); Sat, 22 Apr 2017 17:18:45 -0400 Subject: Re: Experiences with metadata balance/convert To: Duncan <1i5t5.duncan@cox.net>, linux-btrfs@vger.kernel.org References: <78d61749-ec9c-1cc3-196f-5330489e2b3e@mendix.com> From: Hans van Kranenburg Message-ID: <2866c3e6-2be9-897b-386a-a3cc1d0ca43a@mendix.com> Date: Sat, 22 Apr 2017 23:18:42 +0200 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8 Sender: linux-btrfs-owner@vger.kernel.org List-ID: On 04/22/2017 11:17 AM, Duncan wrote: > Hans van Kranenburg posted on Fri, 21 Apr 2017 12:26:18 +0200 as > excerpted: > >> So, I used the clone functionality of the underlying iSCSI target to get >> a writable throw-away version of the filesystem to experiment with >> (great!). > > Please, I'm rather sure you know all this and have setup your system > accordingly, but we need to try to make it explicit any time there's > mention of any sort of device or filesystem cloning tool, that we tell > others that may happen on the post either just reading the list or via a > google or the like... Ack. [1] [1] https://btrfs.wiki.kernel.org/index.php/Gotchas#Block-level_copies_of_devices > [..... .. .. . ... .. . . .. . ..] > (Of course the above is an explanation in far more detail than that > single-liner, because it's the full topic of the post and I might as > well, compared to the simple parenthetical I'm asking for when clone > discussions come up.) Thanks for stressing the fact. And yes, the cloned iSCSI luns are only visible to a completely separate server configured in another initiator group of the target, seen by hardware that is not aware of what's happenning in the production cluster. -- Hans van Kranenburg