From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from [195.159.176.226] ([195.159.176.226]:48112 "EHLO blaine.gmane.org" rhost-flags-FAIL-FAIL-OK-OK) by vger.kernel.org with ESMTP id S1752688AbcHEKRQ (ORCPT ); Fri, 5 Aug 2016 06:17:16 -0400 Received: from list by blaine.gmane.org with local (Exim 4.84_2) (envelope-from ) id 1bVcBW-0000f9-Ga for linux-btrfs@vger.kernel.org; Fri, 05 Aug 2016 12:16:58 +0200 To: linux-btrfs@vger.kernel.org From: Erkki Seppala Subject: Re: How to stress test raid6 on 122 disk array Date: Fri, 05 Aug 2016 13:15:17 +0300 Message-ID: References: <274e0a56-086f-23c4-7ae9-2b6cb68ec6c8@gmail.com> Mime-Version: 1.0 Content-Type: text/plain Sender: linux-btrfs-owner@vger.kernel.org List-ID: Martin writes: > The smallest disk of the 122 is 500GB. Is it possible to have btrfs > see each disk as only e.g. 10GB? That way I can corrupt and resilver > more disks over a month. Well, at least you can easily partition the devices for that to happen. However, I would also suggest that would it be more useful use of the resource to run many arrays in parallel? Ie. one 6-device raid6, one 20-device raid6, and then perhaps use the rest of the devices for a very large btrfs filesystem? Or if you have been using partitioning the large btrfs volume can also be composed of all the 122 devices; in fact you could even run multiple 122-device raid6s and use different kind of testing on each. For performance testing you might only excert one of the file systems at a time, though. -- _____________________________________________________________________ / __// /__ ____ __ http://www.modeemi.fi/~flux/\ \ / /_ / // // /\ \/ / \ / /_/ /_/ \___/ /_/\_\@modeemi.fi \/