From mboxrd@z Thu Jan 1 00:00:00 1970 From: John Robinson Subject: Re: mdadm --add Device or resource busy error and multiple drives "failing" on RAID 6 at once Date: Fri, 16 Jul 2010 13:55:34 +0100 Message-ID: <4C4056C6.6090501@anonymous.org.uk> References: Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: Sender: linux-raid-owner@vger.kernel.org To: "fibreraid@gmail.com" Cc: linux-raid List-Id: linux-raid.ids On 16/07/2010 12:54, fibreraid@gmail.com wrote: > I am using Ubuntu Jaunty (9.04) 64-bit with mdadm 2.6.9 on a whitebox > server with 8GB RAM and dual Xeon quad-core CPUs. I have a RAID 6 > consisting of 12 drives all located in the same enclosure, using the > 1.2 superblock. For some reason, mdadm seems to "kick out" numerous > drives out of the array at once (sometimes 5 or more). This results in > a degraded state. I've tried replacing the cabling, SAS controller to > which the drives are connected, and even updating the drive firmware > but mdadm still seems to do this on occasion (like once a week). I am > highly doubting all these drives are failing at once. Any further > ideas on what might be causing this issue? I recognise these symptoms from earlier postings, relating to problems with the driver for a controller card/chip (I forget which one) and S.M.A.R.T. - you might grep the list archives for references to your controller. Cheers, John.