About evaluating NetBackup performance
You can obtain statistics on NetBackup data throughput from these tools:
Select the reporting tool according to the type of NetBackup operation you want to measure:
Non-multiplexed backup (disk and tape)
Multiplexed backup (tape only)
Restore
Table: Where to obtain NetBackup performance statistics
Operation to report on | In Activity Monitor | In All Log Entries report |
|---|---|---|
Non-multiplexed backup | Yes | Yes |
Multiplexed backup | No (see next column) | Yes Obtain the overall statistics from the All Log Entries report. Wait until all the individual backup operations which are part of the multiplexed backup are complete. In this case, the statistics available in the Activity Monitor for each of the individual backup operations are relative only to that operation. The statistics do not reflect the total data throughput to the tape drive. |
Restore | Yes | Yes |
The statistics from these two tools may differ, because of differences in rounding techniques in the Activity Monitor versus the All Logs report. For a given type of operation, choose one of the tools and consistently record your statistics only from that tool. In both the Activity Monitor and the All Logs report, the data-streaming speed is reported in kilobytes per second. If a backup or restore is repeated, the reported speed can vary between repetitions depending on many factors. Factors include the availability of system resources and system utilization. The reported speed can be used to assess the performance of the data-streaming process.
The statistics from the NetBackup error logs show the actual amount of time reading and writing data to and from the storage device. The statistics do not include the time for mounting and positioning the tape. You should cross-reference the information from the error logs with data from the bpbkar log on the NetBackup client. (The bpbkar log shows the end-to-end elapsed time of the entire process.) Such cross references can indicate how much time was spent on operations unrelated to reading and writing to the storage device.