From mboxrd@z Thu Jan 1 00:00:00 1970 From: Christopher Smith Subject: Re: Problems with multiple Promise SATA150 TX4 cards Date: Tue, 24 Jan 2006 17:58:50 +1100 Message-ID: <43D5D02A.4020909@nighthawkrad.net> References: Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: Sender: linux-raid-owner@vger.kernel.org To: Mark Hahn Cc: linux-raid@vger.kernel.org List-Id: linux-raid.ids Mark Hahn wrote: >> I have shuffled the cards,cables and physical drives around to determine >> that this is not a problem with any of them individually - no matter the >> combination, it only ever happens to drives that are at sd[abcd] (ie: if >> I rejig the hardware so the drive at /dev/sdh, which was working fine, >> is on a different cable and controller, but appears at /dev/sdb, it will >> produce the errors). > > did you test the case where all disks had power, but only 8 were plugged > into controllers? > >> no individual card, cable or drive was responsible. The errors _only_ >> occur with three cards in the system, _only_ with whichever drives are >> attached to the "first" controller (ie: sd[abcd]) and _regardless_ of >> other system activity. > > the "first" card would correspond to position on the PCI bus (slot), > so perhaps that card is getting iffy power. but did you actually move > around which power cables are supplying which disks? Power supply was also one of my suspicions, so I tried powering up half a dozen of the drives off another ATX power supply I had and the remainder off the system PSU. The same problems occurred, which I think rules out the possibility of insufficient power (I did try with all drives powered, but only two cards installed and that worked fine - but I haven't moved around the power plugs of individual drives). I'll try again tonight with all the drives powered off their own PSU, just to be sure. CS