This query is useful for monitoring the capacity limitations for the hardware interfaces between the z/OS host and the IBM TS77xx cache. The FICON channels have data rate limitations. If the data rate routinely approaches the channel throughput limit, you can install additional HBAs (up to four), or install an additional TS77xx grid. Uneven load balancing across the HBAs may indicate a problem. The compression ratio is useful in determining the real virtual volume storage capacity of the TS77xx cache.
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