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# Set CPU I/O resource distribution

Unisphere supports the ability to set parameters to control mixed I/O workloads on an SRDF director.

## About this task

The following explains how to set parameters to control mixed I/O workloads on an SRDF director. Values that are specified here override the default values that are defined in Set system attributes.

## Steps

1. Select the storage system.
2. Select System > Hardware.
3. Click the OR Directors or RDF Directors tab.
4. Select a director port and click CPU I/O Setting.
5. Type values for any number of the following parameters. The percentages must add up to 100.
   - Synchronous I/O Percent—Type the percentage of director resources to allocate for synchronous I/Os.
   - Asynchronous I/O Percent—Type the percentage of director resources to allocate for asynchronous I/Os.
   - Copy I/O Percent—Type the percentage of director resources to allocate for copy I/Os.
6. To reset the parameters to their defaults, click Reset.
7. Click OK.