From mboxrd@z Thu Jan 1 00:00:00 1970 From: Denys Dmytriyenko Subject: Re: sata_sil24 stability and performance Date: Mon, 03 Mar 2008 19:22:15 -0500 Message-ID: <20080304002215.GA13317@denix.org> References: <20080219020916.GA29902@denix.org> <20080219043659.GA11936@jim.sh> <47BAF677.5000602@rtr.ca> <20080302061453.GA7291@denix.org> <005d01c87c4c$0d01f550$4d0fa8c0@M2007> <47CC9197.9050609@gmail.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: Received: from vms042pub.verizon.net ([206.46.252.42]:64808 "EHLO vms042pub.verizon.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1758976AbYCDAWR (ORCPT ); Mon, 3 Mar 2008 19:22:17 -0500 Received: from gandalf.denix.org ([71.255.237.139]) by vms042.mailsrvcs.net (Sun Java System Messaging Server 6.2-6.01 (built Apr 3 2006)) with ESMTPA id <0JX600D3ZJP45VD1@vms042.mailsrvcs.net> for linux-ide@vger.kernel.org; Mon, 03 Mar 2008 18:22:17 -0600 (CST) In-reply-to: <47CC9197.9050609@gmail.com> Content-disposition: inline Sender: linux-ide-owner@vger.kernel.org List-Id: linux-ide@vger.kernel.org To: Tejun Heo Cc: Gabor FUNK , linux-ide@vger.kernel.org, Jim Paris , Mark Lord On Tue, Mar 04, 2008 at 09:02:31AM +0900, Tejun Heo wrote: > Hello, Gabor. > > Gabor FUNK wrote: > > I have/had a similar (hard resetting) problem (2+8 disks, kernel > > 2.6.24), see thread: > > http://www.mail-archive.com/linux-ide@vger.kernel.org/msg15950.html > > > > I tried replacing the PSU and also run the system with two 650W PSU-s, > > also failed. I also think that PSU shouldn't be the problem as I see they > > eat much less in operation than at spinup. > > It's not that simple tho. Some PSUs which happily spin up all the > drives simultaneously have problems maintaining stable operation > afterwards. Anyways, if you used two separate PSUs, and didn't see any > change in failure pattern (ie. drives connected to certain PSU fails or > swapping to which PSU the board is connected alleviates the problem), > it's probably safe to say it's not PSU problem. Gabor, I am pretty much convinced at this point that my exceptions/resetting problem is due to the PSU. I've been testing different configurations lately and was able to get stable system powering 14 (!) drives by both PSUs together. The limiting factor is Amps on a single +12V rail: Coolermaster 750 limits single rail to 19A (6 drives @ 2.8A/drive) and my old Enermax 550 has 24A limit (8 drives @ 2.8A/drive). Even though Coolermaster 750 has 4 rails, the wiring is not optimal and only 1 rail is available for the hard drives... See item #8 here: http://www.pcpower.com/technology/myths/ I am going to try their single-rail Silencer 750, rated at 60A. That said, I'm still puzzled with the low write performance issue. Tejun, As one of the Gurus on this list, can you suggest any tweaks/settings to try out to improve/resolve my 17 MB/s write speed limit? I played with different PCI latencies, read FAQ topic on 32-bit I/O support in libata and ran out of ideas... Please help :) Regards, Denys