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For a quick-start guide to VVOLs, see Quick-start Guide to Configuring VMware Virtual Volumes for Systems Powered by IBM Spectrum Virtualize , REDP-5321. 

In addition, see Configuring VMware Virtual Volumes for Systems Powered by IBM Spectrum Virtualize , SG24-8328. 

## Resources 

Use this option to change memory limits for Copy Services and RAID functions per I/O group. 

Copy Services features and RAID require that small amounts of volume cache be converted from cache memory into bitmap memory to allow the functions to operate. If you do not have enough bitmap space allocated when you try to use one of the functions, you will not be able to complete the configuration. 

The total memory that can be dedicated to these functions is not defined by the physical memory in the system. The memory is constrained by the software functions that use the memory. 

These settings are available from Settings →  System →  Resources , as shown in Figure 5-66. 

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