Mbobjrefreshthresh

When you backup a virtual machine, the data is stored on the IBM Spectrum Protect 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 IBM Spectrum Protect database, and therefore, adversely affect the performance of most IBM Spectrum Protect operations.

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

Supported clients

This option is valid for data movers that protect VMware virtual machines. To use this option, you must have a license agreement to use IBM Spectrum Protect for Virtual Environments: Data Protection for VMware.

This option is valid for data movers that protect Microsoft Hyper-V virtual machines. You must be licensed to use IBM Spectrum Protect for Virtual Environments: Data Protection for VMware, or IBM Spectrum Protect for Virtual Environments: Data Protection for Microsoft Hyper-V to use this option.

Options file

This option is valid in the client options file (dsm.opt). It can also be included on the server in a client options set. It is not valid on the command line.

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.