From mboxrd@z Thu Jan 1 00:00:00 1970 From: Andrew Clayton Subject: Re: RAID 5 performance issue. Date: Fri, 5 Oct 2007 15:32:29 +0100 Message-ID: <20071005153229.2c5406b0@zeus.pccl.info> References: <20071003105321.06943824@zeus.pccl.info> <20071003211910.439ded54@alpha.digital-domain.net> <72dbd3150710031336s331782c3yd0ac7ceda4e81774@mail.gmail.com> <20071004150831.6edbf926@zeus.pccl.info> <20071004154441.31addcfe@zeus.pccl.info> <20071004192653.25eb333b@alpha.digital-domain.net> <20071005115719.4a71ab89@zeus.pccl.info> <20071005135312.04856211@zeus.pccl.info> <20071005143023.2bce96e9@zeus.pccl.info> Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: Sender: linux-raid-owner@vger.kernel.org To: Justin Piszcz Cc: Andrew Clayton , David Rees , linux-raid@vger.kernel.org List-Id: linux-raid.ids On Fri, 5 Oct 2007 10:07:47 -0400 (EDT), Justin Piszcz wrote: > Yikes, yeah I would get them off the PCI card, what kind of > motherboard is it? If you don't have a PCI-e based board it probably > won't help THAT much but it still should be better than placing 3 > drives on a PCI card. It's a Tyan Thunder K8S Pro S2882. No PCIe. Though given the fact that simply patching the kernel (on the RAID fs) when there's no other disk activity slows to a crawl which I'm fairly sure it didn't used, certainly these app stalls are new. The only trouble is I don't have any iostat profile from say a year ago when everything was OK. So I can't be 100% sure the current thing of spikes of iowait and await etc didn't actually always happen and it's actually something else that's wrong. > Justin. Andrew