Date: Fri, 26 Feb 1999 13:14:17 -0500 (EST) From: Tom Pinkl <tom@hbsrx.com> To: aic7xxx@freebsd.org Subject: heterogeneous scsi adapters Message-ID: <9902261814.AA28849@hbsrx.com> In-Reply-To: <36D5EF19.627EC665@redhat.com> from "Doug Ledford" at Feb 25, 99 07:47:21 pm
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Doug Ledford wrote: > How much simultaneous activity do they see? In my case, we had a set of > raid5 drives with 4 of them on aic7xxx and two on buslogic. It blew up > on average about once every two or three days but those drives stayed > quite busy the whole time. I've heard others have problems putting > drives on one card, and tape backup on another which is obviously going > to run simultaneously when backing up the drives. No problems with that setup here. I have a Buslogic BT-958 scsi adapter with three narrow disks and a cd-rom drive, and an Adapter 2940 with two tape drives. All devices are internal. Details below. I'm running a stock 2.0.36 kernel as far as the scsi device drivers are concerned. My backups to the DAT drive complete successfully. I'm using EST's BRU software with the autoscan feature (tape verification) enabled. I'm getting ~200K/sec on tape writes and ~160K/sec on reads. These numbers seem low to me, especially for tape reads. Here are the scsi device details: $ cat /proc/scsi/scsi Attached devices: Host: scsi0 Channel: 00 Id: 00 Lun: 00 Vendor: SEAGATE Model: ST32155N Rev: 0594 Type: Direct-Access ANSI SCSI revision: 02 Host: scsi0 Channel: 00 Id: 01 Lun: 00 Vendor: SEAGATE Model: ST32550N Rev: 0022 Type: Direct-Access ANSI SCSI revision: 02 Host: scsi0 Channel: 00 Id: 05 Lun: 00 Vendor: TEAC Model: CD-ROM CD-516S Rev: 1.0D Type: CD-ROM ANSI SCSI revision: 02 Host: scsi0 Channel: 00 Id: 06 Lun: 00 Vendor: SEAGATE Model: ST34501N Rev: 0015 Type: Direct-Access ANSI SCSI revision: 02 Host: scsi1 Channel: 00 Id: 02 Lun: 00 Vendor: TANDBERG Model: TDC 4222 Rev: =07: Type: Sequential-Access ANSI SCSI revision: 02 Host: scsi1 Channel: 00 Id: 06 Lun: 00 Vendor: HP Model: HP35480A Rev: T603 Type: Sequential-Access ANSI SCSI revision: 02 -- Thomas J. Pinkl 738 Louis Drive Unix Systems Programmer Warminster, Pa 18974 Health Business Systems, Inc. (215) 442-9300 x9260 To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe aic7xxx" in the body of the message
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