Disk space requirements

The self describing agent (SDA) feature requires not only access to a z/OS® UNIX System Services environment, but also a fairly significant amount of disk space in that environment. The suggested amount of disk space is somewhere in the range of 25 to 50 MB.

The average disk space usage depends upon the type of monitoring server:
  • a hub monitoring server requires ~3.25 MB per package
  • each remote monitoring server requires approximately ~2 MB per package
The average amount takes into account the following considerations:
  • The average amount of storage needed by the monitoring server SDA process to backup the existing product files in the $TEMS_MANIFEST_PATH/SDMBACKUP directory.
  • The hub monitoring server SDA process stores all existing SDA package files, including an SDA agent's Tivoli® Enterprise Portal jars, which are the largest jars, often in the 1 to 2 MB range.
  • The remote monitoring has to store only an SDA agent's monitoring server jar files, which are typically less that 500K.
The amount of z/OS UNIX disk space required is also influenced by other factors:
  • The amount of space will fluctuate depending on how many SDA agents register with the z/OS monitoring server and whether multiple SDA installs are in progress.
  • The jar files are extracted into individual files in subdirectories under the monitoring server z/OS UNIX home directory, and those individual files are copied to the runtime environment's RKANDATV library and then automatically deleted. But there will be a high-water mark at which there must be enough space for both the jars and the extracted contents of those jars. The allocated disk space must be generous enough to handle these spikes in disk usage.