Platform Deployment Guide › Object Storage › Integrating with EMC Centera › Configure Centera Integration › Optional Centera Policy Settings

Optional Centera Policy Settings

These settings are optional. Find them in the \Data Management\EMC Centera Integration subfolder of the machine policy.

Maximum Number of Concurrent Storage Operations

Defaults to 10. This setting controls the number of Centera clips that can be stored to Centera simultaneously. Storing more clips at the same time may result in a faster storage rate. You may want to set this number to match the number of storage nodes in the Centera cluster (if there are more than 10 nodes).

Maximum Number of Blobs per Centera Clip

Defaults to 1. This setting defines how many blob files are stored within one Centera clip.

The default value is set to 1 as a precautionary measure. It ensures that data belonging to an event cannot be deleted early if a custom purge script is used to purge events based on criteria other than event expiry date. If you implement such a purge script and need to set this value to more than 1, contact Technical Support for further information. If using the standard purge script, we recommend that this value is set to 100.

Note: Blobs with different retention periods will not be stored in the same Centera clip.

Maximum Number of KBytes per Centera Clip

Defaults to 1,048,576 KB (1 GB). This setting limits the number of blob files stored in a Centera clip by ensuring that the total number of KB stored in the clip does not exceed the value set here.

Clip Buffer Size (KB)

Defaults to 64. This is the size of the Centera internal clip buffer in KB. It specifies the amount of memory to use for temporary storage when sending data to the Centera device.

Content Address Calculation

Defaults to ‘Calculate Content Address During Write’. This setting controls the method used to calculate the Content Address from blob files. Possible values are:

Calculate Content Address Before Write

Content Addresses are calculated on the CMS before data is streamed to the Centera device.

Calculate Content Address During Write

Content Addresses are calculated on the CMS while streaming data to the Centera device.

Calculate Content Address After Write

Content Addresses are calculated on the Centera device itself.

Flush Interval (Seconds)

Defaults to 60. This specifies how long CA DataMinder waits before storing a clip if there are insufficient blob files to fill it. Clip capacity is defined the Maximum Number of blobs per Centera Clip and Maximum Number of KB per Centera Clip settings. If there are not enough blobs to fill the clip according to these settings, CA DataMinder waits for the flush interval to elapse then stores the clip anyway.

Embedded Data Threshold (KB)

Defaults to zero. This is the maximum data size, in KBytes, for data to be embedded in the Centera clip XML instead of being stored separately. The default value of zero KB means that data is never embedded in the clip XML. The maximum value is 100 KB. Embedding data in the clip can improve write performance, but embedded data does not benefit from single-instance storage.