The STKVMD query generates a daily chart for each Virtual Tape Storage System (VTSS). The chart shows the distribution of mount times required to satisfy all Virtual Tape Volume (VTV) mount requests—requests that were satisfied in the DASD buffer and requests requiring recall from the physical tape back store.
The distribution buckets are set at 0.5, 1, 2, 5, 30, 60, 120, and 3600 seconds. If a VTV mount request is satisfied between 0 and 0.5 seconds, it is counted in the 0.5-second bucket. If the mount required between 0.5 and 1 second, it is counted in the 1-second bucket, and so forth. The number of mounts are shown at the SYSID granularity, with each systems count contributing to a stacked vertical bar.
The example shows the daily VTV mount time distribution for StorageTek VTSSID "VTSS4." Most VTV mounts were satisfied in less that ½ second, and SYSID "SYD9" workloads requested most VTV mounts (2,488).
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