NetBackup Drive Performance Summary
For NetBackup jobs, the drive performance algorithm takes into account the use of multiple tapes, as some backups require the dismounting and re-mounting of several tapes. The Kilobytes/second rate is calculated for each piece of tape media used by the backup job.
mediaKilobytes / ((finishReadWrite - startReadWrite) * SECS_IN_A_DAY * (mediaKilobytes/jobKilobytes))
Where:
• mediaKilobytes is the total kilobytes written to an individual piece of tape media
• jobKilobytes is the total size of the backup job, as reported by bpdbjobs
• startReadWrite is the date/time that the job started writing to the tape
• finishReadWrite is the date/time that the job finished writing to the tape
The Drive Performance Summary report displays the minimum, average, and maximum overall drive performance for all jobs for the reporting period. When you drill down to an individual tape drive, the Drive Performance Detail Report uses this same algorithm to display the performance of each job. If there are multiple rows for a single job, such as when multiple tapes are used by the job, the performance metric is averaged across all the rows returned from the above algorithm.
The details from which drive performance is derived can be viewed via drill down links. In the
Drive Performance Detail report, click on the
Finish Date for one of the backup jobs to view the Job Details. At the bottom of the
Job Details Report, the backup attempts (try records) are displayed.