From mboxrd@z Thu Jan 1 00:00:00 1970 From: Francois Barre Subject: Re: multiple Sata SATAII 150, TX4 - how to tell which drive is which?headaches galore! Date: Tue, 24 Jan 2006 18:12:50 +0100 Message-ID: References: <43D62360.5060001@dgreaves.com> <20060124161043.e90064b0@ted.secure-tunnel.com> Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7BIT Return-path: In-Reply-To: <20060124161043.e90064b0@ted.secure-tunnel.com> Content-Disposition: inline Sender: linux-raid-owner@vger.kernel.org To: linux-raid@vger.kernel.org List-Id: linux-raid.ids 2006/1/24, Shawn Usry : > Hmm..that brings up an interesting question - > > Could/would/should a lack of sufficient power to the system, cause disk errors to show up, especially under high I/O? > > Anyone with experience in this? > Of course boy, and I've seen some. Working on a proto based on a Via Epia 10k (Nehemiah), with a home-brew power supply and a couple of pelletier modules, I had problems with 2 IDE drives that were difficult to identify : - spining was quite a long process, but went always ok (drives had trouble to get to full speed, took 10secs for them to warm up). - at heavy load, random crash (and you know how ide crashes). After a long study, it came that the PSU voltage drop down for 12V (at 10.8V, box crashes, net log says). So my (real) question would be : - how much a drive consumes ? how long can it be on diet ? and, on top of this : Is it possible to make the drives turn slower ? To make the heads move slower ? That would be my dream. No more heat, a 10mA consumption, no more noise...