[TriLUG] will a SCSI tape slow down my SCSI disks?

Daniel Monjar daniel.monjar at na.biomerieux.com
Tue Nov 18 14:59:15 EST 2003


Mandrake 9.2 on Intel

(scsi0:A:0): 160.000MB/s transfers (80.000MHz DT, offset 127, 16bit)
(scsi0:A:5): 10.000MB/s transfers (10.000MHz, offset 15)
(scsi0:A:6): 160.000MB/s transfers (80.000MHz DT, offset 63, 16bit)
  Vendor: FUJITSU   Model: MAJ3182MP         Rev: 5508
  Type:   Direct-Access                      ANSI SCSI revision: 04
  Vendor: Quantum   Model: DLT4000           Rev: D069
  Type:   Sequential-Access                  ANSI SCSI revision: 02
  Vendor: IBM       Model: DDYS-T18350N      Rev: S93E
  Type:   Direct-Access                      ANSI SCSI revision: 03


I've had to add a quantum SCSI tape to the same adapter that handles my 
SCSI disks.  Is the tape drive slowing down the disks in any way?  Ages ago 
when I was configuring SCSI DEC systems (VMS 6.2) I was cautioned about 
mixing slow and fast devices on the same bus, because transfer would happen 
at the speed of the slow device.  Still true?

-- 
Dan
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