From mboxrd@z Thu Jan 1 00:00:00 1970 From: Justin Piszcz Subject: Re: Lots of con-current I/O = resets SATA link? (2.6.25.10) Date: Mon, 7 Jul 2008 05:57:23 -0400 (EDT) Message-ID: References: <486FBFAB.5050303@shaw.ca> <48700228.7060904@shaw.ca> Mime-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII; format=flowed Return-path: In-Reply-To: Sender: linux-raid-owner@vger.kernel.org To: Mattias Wadenstein Cc: Robert Hancock , linux-kernel@vger.kernel.org, linux-raid@vger.kernel.org, linux-ide@vger.kernel.org, xfs@oss.sgi.com, Alan Piszcz List-Id: linux-ide@vger.kernel.org On Mon, 7 Jul 2008, Mattias Wadenstein wrote: > On Sat, 5 Jul 2008, Justin Piszcz wrote: > >> >> >> On Sat, 5 Jul 2008, Robert Hancock wrote: >> >>> Justin Piszcz wrote: >>>>> Can you post your dmesg from bootup with the controller/drive detection? >>> >>> So you've got 6 drives in the machine. Intel chipsets normally seem pretty >>> robust with AHCI. >>> >>> Are you certain that your machine has enough power to run all those drives >>> properly? We've seen in a number of cases that power fluctuations or noise >>> can cause these kinds of errors. >> >> I have a 650watt PSU (nice antec one) and the power draw of the box is >> ~148watts w/ veliciraptors, ~250 when fully load all 4 cores + all 12 disks >> writing. I have turned off the irqbalance daemon and I am going to see if >> the problem re-occurs. > > Looking at the sum wattage number is really misleading for this. You need to > dig out the specs for how many amps it can provide on the different voltages > (5 and 12 volts). In particular, many modern PSUs have several separate 12V > rails, where one (or more, some have the 12V supply split into 3 or 4 parts!) > is used for CPU and GFX card power and usually only one is available for > disks. > > You can also have plenty of 12V left but run out of 5V, or the other way > around. I've spent quite some time trying to find a PSU that would handle 18 > disks without costing too much. The splitting of the 12V power into separate > rails and a general lack of 5V compared to what the disks need according to > their specs just made it difficult, and I ended up bonding two PSUs together > (linking the ground together with some custom cabling) to get a stable > machine again. > > /Mattias Wadenstein > Good info here indeed but for my case it does not apply. I used to have Raptor150s (12 of them on the same host) the ONLY thing that changed was the drives themselves. And it used to use 150-250 watts (the 3.5" suck up a lot more power) the power cables are also exactly the same as they were on the Raptor 150s and I never had any issues. I have two hosts, pretty much idential, I use the Antec TruePower Trio 650 in each of them. http://www.antec.com/us/productDetails.php?ProdID=23650 Justin.