Description
After upgrading to NetBackup Appliance version 5.5.0.1, some system kernel tunables may be reset to default levels, which may cause backup performance to be degraded.
Cause
A defect in the NetBackup Appliance version 5.5.0.1 may cause some kernel system parameters to be set to default levels.
Solution
This issue is scheduled to be formally resolved in an upcoming Maintenance Release (MR) for NetBackup Appliance.
Workaround
Setting the system kernel parameters as follows will allow the performance to return to pre-5.5.0.1 levels:
| Parameter | Recommended setting 52x0 | Recommended setting 53x0 |
|---|---|---|
| vm.min_free_kbytes | 2097152 | 4194304 |
| vm.max_map_count | 262144 | 262144 |
| kernel.numa_balancing | 0 | 0 |
Setting system kernel parameters
The kernel parameter vm.min_free_kbytes can be set from the NetBackup Appliance Shell Menu by completing the following:
From the main menu, navigate to Settings > Sysctl
To show the current parameter(s), run: Show vm.min_free_kbytes
Example:
To set the current parameter(s), run: Tune [parameter] [value]
Example:
The other kernel tunables must be from an elevated prompt. Please contact Technical Support for assistance with tuning other parameters.
References
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