VSM - What does the term "Paired RTD's" mean?

Asset ID:	1-71-1014558.1
Update Date:	2018-01-08
Keywords:

Solution Type Technical Instruction Sure

Solution 1014558.1 : VSM - What does the term "Paired RTD's" mean?

Applies to:

Sun StorageTek VSM System - Version 4 to 5C [Release 4.0 to 5.0]
All Platforms

Goal

What does the term Paired RTD's mean in the VSM solution?

Solution

Paired means that two RTDs (Real Tape Drives) share the same CIP (Channel Interface Processor) or FIP (FICON Interface Processor). The two RTDs are installed on consecutive odd/even channel interfaces.
This is only possible on the ICE3 or the VCF card found in the VSM4 and VSM5 product.

The VTSS microcode can only operate one of the RTDs at any one point in time.
VTCS manages scheduling work to the RTDs to minimize the times that both RTDs are in use but sometimes that is not possible.

Product
VSM

Previously Published As
STKKB67793

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