Some additional SVC FC node port congestion statistics became available in SVC v7.8.1 which are helpful to explore problems between SVC and SAN. Prior to SVC v7.8.1 (which means 8GB FC HBAs), metric Buffer credit zero wait % (BBCZ) has always been helpful but this metric is no longer reported by 16GB (and newer) FC HBAs. To cover this gap, IBM developed this new congestion statistic set which is available for FC port types. Please refer to the IBM documentation for more details about them. Especially Transfer congestion > Normal > Blocked int % is the most comparable to Buffer credit zero wait % and has the same meaning: % of measured interval blocked due to congestion.

The new congestion statistics can be found in the metric chooser's Basic- and Expert-Tab of object type "SVC Node Port":


Read more here


All News for Version 5.5