STATUS CODE 89: Increasing shared memory does not prevent backups from failing with a NetBackup Status Code 89 (problems encountered during setup of shared memory).

Article:TECH59841  |  Created: 2009-01-25  |  Updated: 2009-01-25  |  Article URL http://www.symantec.com/docs/TECH59841
Article Type
Technical Solution


Environment

Issue



STATUS CODE 89: Increasing shared memory does not prevent backups from failing with a NetBackup Status Code 89 (problems encountered during setup of shared memory).

Error



problems encountered during setup of shared memory

Solution



Overview:
It is possible that increasing the shared memory kernel parameters based on the calculation in TechNote 183702 (see Related Documents below) will not prevent backup from failing with a NetBackup Status Code 89, especially when backing up a large number of windows clients using the backup selection directive ALL_LOCAL_DRIVES.  

If the amount of shared memory configured in the kernel is adequate based on the shared memory formula, then other possible sources of the status 89 will need to be investigated.

Troubleshooting:


Reducing the value configured in the /usr/openv/netbackup/db/config/NUMBER_DATA_BUFFERS file may resolve the problem.

Log files:  N/A

Resolution:
The shared memory calculation in TechNote 183702 is used to determine the NetBackup media server recommended minimum kernel requirements. It is also used for every UNIX platform that has the option to set tunable kernel parameters (Solaris, Linux, HP-UX). In large environments that are growing, it does become obvious that the recommended minimum kernel parameters (the ones include in the installation guide along with shared memory requirements) are not sufficient and need to be increased.  At that point NetBackup Support would be unable to offer the specific values to which the parameters should be increased.

The information from page 21 of the Veritas NetBackup 6.0 Backup Planning and Performance Tuning Guide for UNIX, Windows, and Linux should also be taken into consideration when determining how much shared memory a media server should allocate.

"As a rule, the number of clients (separate physical hosts) per master server is not a critical factor for NetBackup. Ordinary backup processing performed by each client has little or no impact on the NetBackup server, unless, for instance, the clients all have database extensions or are trying to run ALL_LOCAL_DRIVES at the same time."

In summary, Status Code 89 can occur if there is not adequate shared memory allocated in the kernel.  That is not, however, the only possible cause of this error.  Assuming the kernel has enough shared memory configured, it is necessary to look at the other possible causes of the Status 89.  See the Related Documents section below.

Supplemental Materials

SourceError Code
Value89
Descriptionproblems encountered during setup of shared memory


Legacy ID



303153


Article URL http://www.symantec.com/docs/TECH59841


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