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Veritas NetBackup™ Administrator's Guide, Volume II

Last Published: 2017-06-28

Product(s): NetBackup (8.0)

Methods for determining the NetBackup transfer rate

Calculate three variations of the backup transfer rate by using NetBackup report data.

Three NetBackup transfer rates and calculation methods are available.

Table: NetBackup transfer rates

Transfer rate	Description
Network transfer rate	The network transfer rate is the rate provided in the All Log Entries report. The network transfer rate considers only the time it takes to transfer data over the network from client to server. This rate ignores the following: The time the device requires to load and to position media before a backup. The time that the tape file requires to close and write an additional NetBackup information record to the tape.
Network transfer plus end-of-backup processing rate	This rate ignores the time it takes to load and to position media before a backup. However, the rate does include the end-of-backup processing that is ignored in the network transfer rate. To determine this rate, use the All Log Entries report and calculate the time from the message: begin writing backup id xxx until the message successfully wrote backup id xxx To calculate the transfer rate, divide this time (in seconds) into the total bytes that are transferred. (The total bytes that are transferred are recorded in the All Log Entries report.)
Total transfer rate	This transfer rate includes the time it takes to load and position the media as well as the end-of-backup processing. Use the List Client Backups report to calculate the transfer rate by dividing Kilobytes by Elapsed Time (converted to seconds).

Transfer rate

Description

Network transfer rate

The network transfer rate is the rate provided in the All Log Entries report.

The network transfer rate considers only the time it takes to transfer data over the network from client to server.

This rate ignores the following:

The time the device requires to load and to position media before a backup.
The time that the tape file requires to close and write an additional NetBackup information record to the tape.

Network transfer plus end-of-backup processing rate

This rate ignores the time it takes to load and to position media before a backup. However, the rate does include the end-of-backup processing that is ignored in the network transfer rate. To determine this rate, use the All Log Entries report and calculate the time from the message:

begin writing backup id xxx

until the message

successfully wrote backup id xxx

To calculate the transfer rate, divide this time (in seconds) into the total bytes that are transferred. (The total bytes that are transferred are recorded in the All Log Entries report.)

Total transfer rate

This transfer rate includes the time it takes to load and position the media as well as the end-of-backup processing. Use the List Client Backups report to calculate the transfer rate by dividing Kilobytes by Elapsed Time (converted to seconds).

On Windows, the Microsoft Windows System Monitor also displays the NetBackup transfer rate.

Examples of the reports that provide backup data to calculate transfer rates

Assume that the reports provide the following data.

Sample All Log Entries report:

TIME               SERVER/CLIENT   TEXT 
04/28/09 23:10:37  windows giskard begin writing backup
                   id giskard_0767592458, fragment 1 to
                   media id TL8033 on device 1 . . .
04/29/09 00:35:07  windows giskard successfully wrote
                   backup id giskard_0767592458,
                   fragment 1, 1161824 Kbytes at
                   230.325 Kbytes/sec

Sample List Client Backups Report:

  Client:                     giskard 
  Backup ID:                  giskard_0767592458 
  Policy:                     production_servers 
  Client Type:                Standard 
  Sched Label:                testing_add_files 
  Schedule Type:              Full 
  Backup Retention Level:     one week (0) 
  Backup Time:                04/28/09 23:07:38 
  Elapsed Time:               001:27:32 
  Expiration Time:            05/05/09 23:07:38 
  Compressed:                 no 
  Kilobytes:                  1161824 
  Number of Files:            78210

The following three rates were compiled with the backup data from the sample reports:

Network transfer rate:

1161824 KB at 230.325 KB per second

Network transfer plus end-of-backup processing rate:

23:10:30 - 00:35:07 = 01:24:30 = 5070 seconds

1161824 KB/5070 = 229.157 KB per second

Total transfer rate:

Elapsed time = 01:27:32 = 5252 seconds

1161824 Kbytes/5252 = 221.216 KB per second