SET DEDUPVERIFICATIONLEVEL (Set the percentage of extents to verify)

Use this command to verify extents sent to the server during client-side data deduplication.

A rogue application that resides on a client system and that imitates the client, API, or GUI application can initiate an attack on the server. To reduce server vulnerability to such attacks, you can specify a percentage of client extents for the server to verify.

If the server detects that a security attack is in progress, the current session is canceled. In addition, the setting of the DEDUPLICATION parameter on the REGISTER NODE command is changed. The setting is changed from CLIENTORSERVER to SERVERONLY. The SERVERONLY setting disables client-side data deduplication for that node.

The server also issues a message that a potential security attack was detected and that client-side data deduplication was disabled for the node. If client-side data deduplication is disabled, all other client operations (for example, backup operations) continue. Only client-side data deduplication is disabled. If client-side data deduplication is disabled for a node because a potential attack was detected, the server deduplicates the data that is eligible for client-side data deduplication.

Privilege class

To issue this command, you must have system privilege.

Syntax

Read syntax diagramSkip visual syntax diagram
                               .-0-------------.   
>>-Set DEDUPVERificationlevel--+---------------+---------------><
                               '-percent_value-'   

Parameters

percent_value (Required)
Specify an integer value 0 - 100 to indicate the percentage of client extents to be verified. A value of 0 indicates that no client extents are verified. The default for this command is 0.
Tips:
  • Verifying extents consumes processing power and adversely affects server performance. For optimal performance, do not specify values greater than 10 for this command.

  • To display the current value for SET DEDUPVERIFICATIONLEVEL, issue the QUERY STATUS command.

Example: Specify a minimum level of data deduplication verification

To specify that 1% of extents created during client-side data deduplication are verified, issue the following command: 
set dedupverificationlevel 1

Example: Turn off data deduplication verification

To specify that none of the extents created during client-side data deduplication are verified, issue the following command:
set dedupverificationlevel 0

Related commands

Table 1. Commands related to SET DEDUPVERIFICATIONLEVEL
Command Description
DEFINE STGPOOL Defines a storage pool as a named collection of server storage media.
QUERY CONTENT Displays information about files in a storage pool volume.
QUERY STATUS Displays the settings of server parameters, such as those selected by the SET commands.
REGISTER NODE Defines a client node to the server and sets options for that user.
UPDATE NODE Changes the attributes associated with a client node.
UPDATE STGPOOL Changes the attributes of a storage pool.