The STKCTA query produces two sets of daily charts. The charts show the StorageTek Virtual Tape Storage Subsystem (VTSS) channel activity for the data links servicing both host applications and the real tape drives managing the physical tape back store.
A summary chart set produces two daily charts for each SYSID and VTSSID combination. The first summary chart shows the total daily channel I/O for the HOST channel links. The second summary chart shows the total daily channel I/O for the Real Tape Drive (RTD) channel links. Both charts use vertical bars to show the channel I/O and horizontal lines to show the channel links control unit busy.
The detail chart set shows the same information at the hourly level for each individual channel link.
The top example shows the summary chart for the RTD links servicing VTSSID "VTSS1" for activity originating from SYSID "SYA5." Link "NONAME03" had the highest I/O volume of all the RTD links at just over 22 million I/Os for the day.
The bottom example shows the detail chart for link "NONAME03"—the high volume channel link in the shown in the summary chart example. This detail chart shows that the highest I/O volume occurred in HOUR 3 at just over 1.7 million I/O’s. The channel control unit busy rate was just over 70 percent at HOUR 3.
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