Ficon channel extension guidelines – Sun Microsystems StorageTek 96257 User Manual
Page 75
96257
Sun Confidential: Internal Only
B-75
Revision A
B
FICON Channel Extension
Guidelines
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.