From owner-freebsd-scsi Tue Aug 29 8:10:30 2000 Delivered-To: freebsd-scsi@freebsd.org Received: from sabre.velocet.net (sabre.velocet.net [198.96.118.66]) by hub.freebsd.org (Postfix) with ESMTP id 1D97537B422 for ; Tue, 29 Aug 2000 08:10:28 -0700 (PDT) Received: from office.tor.velocet.net (trooper.velocet.net [216.126.82.226]) by sabre.velocet.net (Postfix) with ESMTP id A3E19137F0E; Tue, 29 Aug 2000 11:10:21 -0400 (EDT) Received: (from dgilbert@localhost) by office.tor.velocet.net (8.9.3/8.9.3) id LAA08697; Tue, 29 Aug 2000 11:10:20 -0400 (EDT) (envelope-from dgilbert) From: David Gilbert MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Message-ID: <14763.53851.632330.327801@trooper.velocet.net> Date: Tue, 29 Aug 2000 11:10:19 -0400 (EDT) To: "Kenneth D. Merry" Cc: David Gilbert , freebsd-SCSI@FreeBSD.ORG Subject: Re: SCSI disconnect with quantum Atlas IV disks. In-Reply-To: <20000828233257.A35815@panzer.kdm.org> References: <14762.31347.647187.677745@trooper.velocet.net> <20000828233257.A35815@panzer.kdm.org> X-Mailer: VM 6.75 under 20.4 "Emerald" XEmacs Lucid Sender: owner-freebsd-scsi@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.org >>>>> "Kenneth" == Kenneth D Merry writes: Kenneth> I kinda wonder if your enclosure is underpowered. One thing Kenneth> that can cause drives to behave strangely is if they aren't Kenneth> getting enough power. Kenneth> When drives spin up, and when they're under high seek load, Kenneth> they use a fair bit more power than they do when they're just Kenneth> spinning idle. Kenneth> Are your drives alone on that power supply? If so, you Kenneth> should be able to look at the drive specs for peak Kenneth> current/power usage, and compare that with what your power Kenneth> supply is spec'ed for. The case is designed for 8 drives. There are two (redundant) power supplies and there are 8 drive power connectors supplied (along with two motherboard connectors that are unused). These are 18G Atlas IV's which are 7200 RPM drives (not even the fastest out there). Kenneth> The types of errors you're getting, timed out in data-out Kenneth> phase, indicate that a signal is stuck on the SCSI bus. It's Kenneth> not just stuck momentarily, but has been stuck for 60 Kenneth> seconds. Kenneth> I suppose that could be caused by power problems, although it Kenneth> is more often a cabling and termination problem. Well... The cables are the ones that come with the TekRAM 390F. They're twisted in a funny way and they have 6 connectors (4 drives, card and terminator). The terminator is physically in the last connector and the controller is in the first. Dave. -- ============================================================================ |David Gilbert, Velocet Communications. | Two things can only be | |Mail: dgilbert@velocet.net | equal if and only if they | |http://www.velocet.net/~dgilbert | are precisely opposite. | =========================================================GLO================ To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-scsi" in the body of the message