From mboxrd@z Thu Jan 1 00:00:00 1970 From: Niccolo Rigacci Subject: Re: IBM xSeries stop responding during RAID1 reconstruction Date: Thu, 15 Jun 2006 11:12:19 +0200 Message-ID: <20060615091219.GB2080@rigacci.org> References: <20060614085354.GA18106@rigacci.org> <44902F41.8030300@rcn.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: Content-Disposition: inline In-Reply-To: <44902F41.8030300@rcn.com> Sender: linux-raid-owner@vger.kernel.org To: Bill Cizek Cc: linux-raid@vger.kernel.org List-Id: linux-raid.ids On Wed, Jun 14, 2006 at 10:46:09AM -0500, Bill Cizek wrote: > Niccolo Rigacci wrote: > > >When the sync is complete, the machine start to respond again > >perfectly. > > > I was able to work around this by lowering > /proc/sys/dev/raid/speed_limit_max to a value > below my disk thruput value (~ 50 MB/s) as follows: > > $ echo 45000 > /proc/sys/dev/raid/speed_limit_max Thanks! This hack seems to solve my problem too. So it seems that the RAID subsystem does not detect a proper speed to throttle the sync. Can you please send me some details of your system? - SATA chipset (or motherboard model)? - Disks make/model? - Do you have the config file of the kernel that you was running (look at /boot/config- file)? I wonder if kernel preemption can be blamed for that, or burst speed of disks can fool the throttle calculation. -- Niccolo Rigacci Firenze - Italy Iraq, missione di pace: 38355 morti - www.iraqbodycount.net