Date: Sun, 19 Jul 1998 22:09:05 +0200 From: Stefan Esser <se@FreeBSD.ORG> To: "Saad M. Waraich" <Saad.Waraich@Pakistan.NCR.COM>, stable@FreeBSD.ORG Cc: leo@talcom.net, Stefan Esser <se@FreeBSD.ORG> Subject: Re: NCR 875 and tagged queing. Broken? Message-ID: <19980719220905.C25078@mi.uni-koeln.de> In-Reply-To: <199807130844.NAA11954@isb.ncr.com.pk>; from Saad M. Waraich on Mon, Jul 13, 1998 at 01:44:54PM %2B0500 References: <19980712103316.07090@mi.uni-koeln.de> <199807130844.NAA11954@isb.ncr.com.pk>
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On 1998-07-13 13:44 +0500, "Saad M. Waraich" <Saad.Waraich@Pakistan.NCR.COM> wrote: > The problem is a combination of the NCR driver and the Atlas III drive. > I have an 875 based card (Tekram 390F) and a 2 gig. Atlas III drive and > I've seen this problem a lot. It is specific to certain drives. > Upgrading the drive's firmware didn't help either. Is it worth it to talk > to Quantum about this problem ? They could easily shrug it off saying > that it is a problem in the driver. Well, it is in fact a problem of the driver if it does not survive a QUEUE_FULL status. If your system runs reliable even though there are those messages "assertion failed" logged, then just wait for the CAM driver to be released. You may try the pre-release version of the CAM driver, but it is not as well tested as that for the Adaptec cards, and I'm not sure how robust it is on a highly loaded server. You may compare performance with tags enabled and without, and it depends on your work load, whether there will be that much of a difference. I have used "Bonnie" (in ports/benchmarks) to estimate the impact of running without tags. But that might not at all be a realistic test for the kind of load your system sees. Regards, STefan To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-stable" in the body of the message
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