Sun Microsystems 96257 manual FICON Channel Extension Guidelines

FICON Channel Extension Guidelines

B

This appendix provides information about FICON channel extensions for the VSM system. Content includes:

•“Definition of Terms” on page B-76

•“General Channel Extension Considerations”, including:

-“Understand Channel Extension Performance Limitations” on page B-77

-“Channel Extenders Are Invisible to Other Devices” on page B-77

-“Channel Extenders Can Cause Timing Problems” on page B-77

-“Channel Extenders Can Insert Fake I/O Errors” on page B-77

-“Avoid RECLAIMs and DRAINs on Channel-Extended RTDs” on page B-77

-“Avoid RECALLs on Channel-Extended RTDs” on page B-77

-“Avoid Syncsort Apps That Use Long Chains on Channel-Extended VTDs” on page B- 77

•“FICON Topologies” on page B-78

•“Placement of Extension Equipment” on page B-78

•“Interoperability Testing” on page B-78

•“FICON Channel Extension – Sample Configurations” on page B-79

•“McData/CNT Channel Extension Interoperability”, including:

-“Set Buffer-to-Buffer Credits at Director Ports” on page B-81

-“Set Extension-Attached Director Ports to Fixed Speeds” on page B-81

-“Set Extension Ports to Fixed Speeds When Extending a VTSS-to-VTSS Channel Link (CLINK) or a VTSS-to-RTD Link” on page B-82

-“ISL Failover Is Supported Only in Shuttle Mode” on page B-82

-“Avoiding Host Protocol Timeouts” on page B-82

-“Performance Considerations” on page B-82

•“Cisco Systems Channel Extension Interoperability” on page B-83.

Note: Always consult your selected vendor’s release documentation for their extension products, and guidelines for proper application of those products.

96257	Sun Confidential: Internal Only	B-75
	Revision A