HP LTO - Possible Performance Issues With Ultra[TM] 320 SCSI Interface Tape Drives

Asset ID:	1-71-1005203.1
Update Date:	2017-08-07
Keywords:

Solution Type Technical Instruction Sure

Solution 1005203.1 : HP LTO - Possible Performance Issues With Ultra[TM] 320 SCSI Interface Tape Drives

Applies to:

HP LTO3 Tape Drive - Version Not Applicable and later
HP LTO2 Tape Drive - Version Not Applicable and later
All Platforms

Goal

SCSI tape drives with an Ultra 320 interface, such as the HP LTO3, can experience performance issues or SCSI aborted commands if more than two drives are daisy chained on one bus.

Solution

The SCSI Ultra 320 Interface is susceptible to noise, cable reflections and cable quality.

Daisy chaining devices on an Ultra 320 bus adds to the potential for problems that can result in performance issues due to reduced transfer rates. If the problems cannot be managed by dynamic data rate reduction, the result will be aborted commands evidenced by ?0B? sense keys. These problems can be intermittent or in some cases produce symptoms that are always present, rendering the drive unusable. OEM Drive Engineering will not support configurations with Ultra 320-capable tape drives daisy chained on a bus with Sun/StorageTek libraries. Engineering will not support daisy chaining more than two Ultra 320 tape drives on the same bus. In the interest of customer satisfaction, every effort must be made to prevent configurations that exceed these parameters.

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