From mboxrd@z Thu Jan 1 00:00:00 1970 From: "Billy Crook" Subject: Multipath behavior Date: Tue, 22 Apr 2008 12:48:14 -0500 Message-ID: <135ea5430804221048g2e0ba8ci3d96a23ed9afdea5@mail.gmail.com> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Return-path: Content-Disposition: inline Sender: linux-raid-owner@vger.kernel.org To: linux-raid@vger.kernel.org List-Id: linux-raid.ids I am considering implementing multipath for iSCSI. Documentation is scant though, so I thought I'd ask my questions here. Does mdadm multipath loadbalance IO, or just allow for failover, or both? Is there any advantage to notifying mdadm pre-emptively if possible before a path goes down? I assume bringing a path online has to be done manually like adding a disk. Can spare paths be used? The kernel involved is 2.6.18-53.1.14.el5. Thank you for your time. -Billy Crook