I/O governing

You can set the maximum amount of I/O activity that a host sends to a virtual disk (VDisk). This amount is known as the I/O governing rate. The governing rate can be expressed in I/Os per second or MB per second.

Read, write, and verify commands that access the physical medium are subject to I/O governing.

I/O governing does not effect FlashCopy® and data migration I/O rates.

Governing is applied to Metro Mirror and Global Mirror primary and secondary VDisks as follows:

If an I/O governing rate is set on a secondary VDisk, the same I/O governing rate is applied to the primary VDisk.
If you set an I/O governing rate on the primary and the secondary VDisk, the I/O governing rate for the pair is the lowest rate that is set.