The TS7HBA query generates two daily charts for Cluster 0 of each TS77xx grid. The charts show host channel I/O data volume, data rates, and Host Bus Adaptors (HBA) data compression ratios achieved for data written to the TS77xx cache.
A detail chart produces a daily chart for each HBA. The chart shows the hourly host to HBA FICON channel data volume (uncompressed MB) written to and read from the cache using stacked vertical bars. The hourly MB/sec HBA throughput rate and FICON channel MB/sec capacity threshold (hardcoded at 100 MB/sec) are displayed using horizontal lines. The summary chart displays the daily total MB of data volume processed by each HBA. The data volume values are shown both as uncompressed and compressed MB of data using vertical bars. The read, write, and overall HBA compression ratios are displayed using horizontal lines.
The top example shows the summary chart for Grid 00100, Cluster 0 of an IBM TS7700. Four active HBAs and the data processing load is evenly distributed across the HBAs. For the day shown, the compression ratio achieved for data read from cache by host applications was 3.4 to 1—better than the compression ratio achieved for new data written to cache at 3.04 to 1. Data read from cache is uncompressed by the HBAs, so the read compression ratio actually reflects the compression ratio achieved when the data was earlier written to cache.
The bottom example shows the detailed hourly activity for HBA 8000 in the same grid and cluster. The vertical bars show that for most hours of the day more data is written to cache than read. Hour 10 was the hour with the highest data volume. The FICON channel data rate for that hour averaged 93 MB/sec—close to the maximum data rate of 100 MB/sec.
Investigate either end of the channel to avoid possible IO throughput issues during peak processing. In addition, the report shows the amount of compressed I/O data on the cache side of the HBA, which is a visual view of the data compression achieved by the HBA. In this case, it looks to be between a 3:1 and 4:1 ratio. The green reference line on the right axis is the megabytes per second capacity of a FICON channel, 100 MBs. The blue line indicates that for the overall day, in this case, the overall megabytes per second processed averaged 50 MBs. To view the hourly processing rates, and identify the peak hours, review the Channel IO to HBA Interfaces charts in this same query.
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