Date: Thu, 26 Feb 1998 12:12:38 -0800 From: Derek Seaman <dseaman@spawar.navy.mil> To: aic7xxx@FreeBSD.ORG Subject: aic78xx SCB paging Message-ID: <199802262011.MAA12322@marlin.nosc.mil>
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As I"ve mentioned before on this list I'm building a Linux system with 6 DDS-2 DAT drives so that I can make a tape duplicator system. My experimental system consists of 6 HP C1599A DDS-2 tape drives, a 2940U, and a ST34572N HD. The final system will have a second 2940AU dedicated to the tape drives. Using kernel 2.1.87 the system works fine if I only do three 'dd' commands at once. The SCSI LED is constantly on (as expected). However, when I start the fourth dd, tape activity _drastically_ decreases and the SCSI LED is mostly off. The same behavior is seen with 2.0.33. After some experimenting, I found that turning OFF SCB paging corrects the problem in all kernels I've tried. Has anyone else experienced this problem? Is this a 'feature' or a bug? Derek L. Seaman, Engineer SPAWAR System Center, San Diego Tactical Cryptologic Systems, D7213 dseaman@spawar.navy.mil Ph: (619) 553-6795 Fx: (619) 553-1133 To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe aic7xxx" in the body of the message
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