Date: Tue, 29 Aug 2000 11:10:19 -0400 (EDT) From: David Gilbert <dgilbert@velocet.ca> To: "Kenneth D. Merry" <ken@kdm.org> Cc: David Gilbert <dgilbert@velocet.ca>, freebsd-SCSI@FreeBSD.ORG Subject: Re: SCSI disconnect with quantum Atlas IV disks. Message-ID: <14763.53851.632330.327801@trooper.velocet.net> In-Reply-To: <20000828233257.A35815@panzer.kdm.org> References: <14762.31347.647187.677745@trooper.velocet.net> <20000828233257.A35815@panzer.kdm.org>
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>>>>> "Kenneth" == Kenneth D Merry <ken@kdm.org> 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
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