Mbobjrefreshthresh

When you backup a virtual machine, the data is stored on the Tivoli Storage Manager server in 128 MB units, called megablocks. If an area on the production disk changes and a new incremental backup is performed, a new megablock is created to represent the changes that were made to the previously backed up data. Because a new megablock can be created with each incremental backup, eventually the megablocks can adversely affect the performance of the Tivoli Storage Manager database, and therefore, adversely affect the performance of most Tivoli Storage Manager operations.

Use this option when estimating Tivoli Storage Manager objects that represent production data for each virtual machine backup. For example, when the number of Tivoli Storage Manager objects exceed this value, the megablock is refreshed. This action means that the entire 128-MB block is copied to the Tivoli Storage Manager server and is represented as a single Tivoli Storage Manager object. The minimum value is 2 and the maximum value is 8192. The default value is 50.

Supported clients

This option is valid for clients that act as data mover nodes that protect VMware virtual machines. You must be licensed to use Tivoli Storage Manager for Virtual Environments: Data Protection for VMware to use this option.

This option is valid for clients that act as data mover nodes that protect VMware virtual machines or on clients that protect Microsoft Hyper-V virtual machines. You must be licensed to use Tivoli Storage Manager for Virtual Environments: Data Protection for VMware, or Tivoli Storage Manager for Virtual Environments: Data Protection for Microsoft Hyper-V to use this option.

Options file

Specify this option in the client options file.

Syntax

                       .-50------.   
>>-MBOBJREFRESHTHRESH -+---------+-----------------------------><
                       '-integer-'   

Parameters

The minimum value you can specify is 2 megablocks, the largest value is 8192 megablocks; the default is 50 megablocks.