From mboxrd@z Thu Jan 1 00:00:00 1970 From: Neil Matai Subject: Simultaneous assembly on multiple hosts Date: Sat, 4 May 2013 14:01:46 +1200 Message-ID: <20130504020146.GD31411@chc-5.metaname.net> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: Content-Disposition: inline Sender: linux-raid-owner@vger.kernel.org To: linux-raid@vger.kernel.org List-Id: linux-raid.ids Hi all, Is it dangerous have an array assembled on two hosts at the same time? Say I have servers A and B exporting devices a and b via ATA over Ethernet or similar to hosts C and D. If a and b are components of an array then both C and D automatically assemble the array as soon as the components a and b are exported but is this safe (on the proviso that only one of C or D is ever writing to the array at any time and that there is no write-behind caching above the array device)? Thank you, - neil