Storage Lifecycle Policy (SLP) tuneable parameters to optimize the duplication process.
| Article:TECH72995 | | | Created: 2009-01-31 | | | Updated: 2010-01-09 | | | Article URL http://www.symantec.com/docs/TECH72995 |
Problem
Storage Lifecycle Policy (SLP) tuneable parameters to optimize the duplication process.
Solution
An optional configuration file can be created to assist the
lifecycle to run duplication jobs more efficiently. To prevent the lifecycle
from running numerous small duplication jobs in frequent succession, NetBackup
accumulates lists of similar images into a batch. Then, each batch of images is
copied as a set in one duplication job, instead of
one image at a time.
The NetBackup administrator can change how large the batch files can become, or how frequently batch jobs are requested. To do so, the administrator creates and changes the default parameters in the LIFECYCLE_PARAMETERS file. One or all of the parameters can appear in any order in the LIFECYCLE_PARAMETERS file. If the file is not present in the following directory, NetBackup uses the default parameters:
Windows: install_path\NetBackup\db\config
Unix/Linux: install_path/netbackup/db/config
MIN_KB_SIZE_PER_DUPLICATION_JOB
The MIN_KB_SIZE_PER_DUPLICATION_JOB parameter default is 8 gigabytes. This parameter indicates the total size that the image batch can reach before a duplication job is run for the batch. The lifecycle looks for completed images to be added to a batch every five minutes. The lifecycle does not request a duplication job until either:
one image at a time.
The NetBackup administrator can change how large the batch files can become, or how frequently batch jobs are requested. To do so, the administrator creates and changes the default parameters in the LIFECYCLE_PARAMETERS file. One or all of the parameters can appear in any order in the LIFECYCLE_PARAMETERS file. If the file is not present in the following directory, NetBackup uses the default parameters:
Windows: install_path\NetBackup\db\config
Unix/Linux: install_path/netbackup/db/config
MIN_KB_SIZE_PER_DUPLICATION_JOB
The MIN_KB_SIZE_PER_DUPLICATION_JOB parameter default is 8 gigabytes. This parameter indicates the total size that the image batch can reach before a duplication job is run for the batch. The lifecycle looks for completed images to be added to a batch every five minutes. The lifecycle does not request a duplication job until either:
- The total size of the images in a batch reaches the minimum size as indicated by MIN_KB_SIZE_PER_DUPLICATION_JOB, or
- The MAX_MINUTES_TIL_FORCE_SMALL_DUPLICATION_JOB time has passed. This parameter determines the maximum time between batch requests.
MAX_KB_SIZE_PER_DUPLICATION_JOB
The MAX_KB_SIZE_PER_DUPLICATION_JOB parameter default is 25 gigabytes. This parameter determines how large the image batch can grow. When the size reaches the size as indicated by this parameter, no more images are added to the batch.
MAX_MINUTES_TIL_FORCE_SMALL_DUPLICATION_JOB
The MAX_MINUTES_TIL_FORCE_SMALL_DUPLICATION_JOB parameter default is 30 minutes. If the minimum batch size is not reached by the time indicated, the lifecycle requests a duplication job, regardless of the size.
LIFECYCLE_PARAMETERS file example
The following is an example of the contents and syntax for a LIFECYCLE_PARAMETERS file, using the default values:
MIN_KB_SIZE_PER_DUPLICATION_JOB 8192
MAX_KB_SIZE_PER_DUPLICATION_JOB 25600
MAX_MINUTES_TIL_FORCE_SMALL_DUPLICATION_JOB 30
NOTE: The value for parameters MIN_KB_SIZE_PER_DUPLICATION and MAX_KB_SIZE_PER_DUPLICATION_JOB is in KB (Kilobytes).
The value for parameter MAX_MINUTES_TIL_FORCE_SMALL_DUPLICATION_JOB is in minutes.
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Legacy ID
329179
Article URL http://www.symantec.com/docs/TECH72995
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