As part of the Lead Time package, we include the following tools:
A cache hit Predictor has been added to the Lead Time Tools menu. The goal is to estimate the cache hit ratios for a given cache size using the cache hit ratios for the current cache size. This Predictor is simple to use and very fast. It can be particularly useful when using Lead Time to represent Open Systems environments since controller cache statistics are generally not available from standard system instrumentation in Open Systems. Note that cache hit prediction is not a well established and validated technique. More reliable results can be expected from I/O traces and cache simulation.
A companion mainframe data extractor. Together with model generating facilities of Lead Time, Xtract allows near-automatic building of a Lead Time model corresponding to the observed workload of a selected set of devices in the user’s system.
Currently, we support:
A companion tool to model selected in-line Storage Area Network configurations. The tool is fully integrated with Lead Time, and can be run from within Lead Time or stand alone, invoking the Lead Time modeling engine as necessary.
When a GTF trace is used as a source of monitor information, GTFSIM™, a special facility on the Personal Computer side allows to run simulations of various environments to accurately assess the effect of varying cache and NVS sizes, as well as of specific treatment of Define Extent flags as used by System Managed Storage.