Ensuring Integrity When Sharing DASD Under z/VM

Ensuring Integrity When Sharing DASD Under z/VM

When sharing DASD under z/VM, you should:

• Verify that host z/VM systems forward serialization requests to DASD hardware so that the DASD hardware can perform serialization.

  This process, which serializes access among several real processors that are sharing a device, is known as real reserve/release processing.

• Use the z/VM virtual reserve/release processing feature to serialize access among systems that are running as guests under the same z/VM operating system.

This section contains the following topics:

Serializing Access in z/VM Environments

Serializing Access Through Real Reserve/Release Processing

Serializing Access Through Virtual Reserve/Release Processing