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NetBackup™ Backup Planning and Performance Tuning Guide

Last Published: 2024-04-16

Product(s): NetBackup (10.4, 10.3.0.1, 10.3, 10.2.0.1, 10.2, 10.1.1, 10.1, 10.0.0.1, 10.0, 9.1.0.1, 9.1, 9.0.0.1, 9.0, 8.3.0.2, 8.3.0.1, 8.3)

Finding wait and delay counter values

Wait and delay counter values can be found by creating debug log files on the NetBackup media server.

Note:

The debug log files introduce additional overhead and have a small effect on the overall performance of NetBackup. This effect is more noticeable for a high verbose level setting. Normally, you should not need to run with debug logging enabled on a production system.

To find the wait and delay counter values for a local client backup

Activate debug logging by creating the appropriate log directories on the media server:
Linux/UNIX
For example:
```
/usr/openv/netbackup/logs/bpbkar
/usr/openv/netbackup/logs/bptm
```
Windows
```
install_path\NetBackup\logs\bpbkar
install_path\NetBackup\logs\bptm
```
The following topic lists log directories for processes that may be used in place of bpbkar, for database extensions:
See Processes used in NetBackup client-server communication.
Execute your backup.
Consult the log for the data producer process.
The line should be similar to the following, with a timestamp corresponding to the completion time of the backup:
Example from the bpbkar log:
```
... waited 224 times for empty buffer, delayed 254 times
```
In this example the wait counter value is 224 and the delay counter value is 254.
Look at the log for the data consumer process.
The line should be similar to the following, with a timestamp corresponding to the completion time of the backup:
```
... waited for full buffer 1 times, delayed 22 times
```
In this example, the wait counter value is 1 and the delay counter value is 22.

To find the wait and delay counter values for a remote client backup

Activate debug logging by creating this directory on the media server:
Linux/UNIX
```
/usr/openv/netbackup/logs/bptm
```
Windows
```
install_path\NetBackup\logs\bptm
```
Execute your backup.
Look at the log for the bptm process in:
Linux/UNIX
```
/usr/openv/netbackup/logs/bptm
```
Windows
```
install_path\NetBackup\logs\bptm
```
Delays that are associated with the data producer (bptm child) appear as follows:
```
... waited for empty buffer 22 times, delayed 151 times, ...
```
In this example, the wait counter value is 22 and the delay counter value is 151.
Delays that are associated with the data consumer (bptm parent) appear as:
```
... waited for full buffer 12 times, delayed 69 times
```
In this example the wait counter value is 12, and the delay counter value is 69.

To find the wait and delay counter values for a local client restore

Activate logging by creating the two directories on the NetBackup media server:
Linux/UNIX
```
/usr/openv/netbackup/logs/bptm
/usr/openv/netbackup/logs/tar
```
Windows
```
install_path\NetBackup\logs\bptm
install_path\NetBackup\logs\tar
```
The following topic lists log directories for processes that may be used in place of tar, for database extensions:
See Processes used in NetBackup client-server communication.
Execute your restore.
Look at the log for the data consumer (tar or tar32) in the tar log directory.
The line should be similar to the following, with a timestamp corresponding to the completion time of the restore:
```
 ... waited for full buffer 27 times, delayed 79 times
```
In this example, the wait counter value is 27, and the delay counter value is 79.
Look at the log for the data producer (bptm) in the bptm log directory.
The line should be similar to the following, with a timestamp corresponding to the completion time of the restore:
```
... waited for empty buffer 1 times, delayed 68 times
```
In this example, the wait counter value is 1 and the delay counter value is 68.

To find the wait and delay counter values for a remote client restore

Activate debug logging by creating the following directory on the media server:
Linux/UNIX
```
/usr/openv/netbackup/logs/bptm
```
Windows
```
install_path\NetBackup\logs\bptm
```
Execute your restore.
Look at the log for bptm in the bptm log directory.
Delays that are associated with the data consumer (bptm child) appear as follows:
```
... waited for full buffer 36 times, delayed 139 times
```
In this example, the wait counter value is 36 and the delay counter value is 139.
Delays that are associated with the data producer (bptm parent) appear as follows:
```
... waited for empty buffer 95 times, delayed 513 times
```
In this example the wait counter value is 95 and the delay counter value is 513.