Paging VIOS Redundancy

When you migrate a partition that uses shared memory, you can configure the mobile partition to use redundant paging VIOS partitions on the destination managed system. When the destination managed system is configured with redundant paging VIOS partitions, redundant-capable paging space devices may be available to both VIOS partitions and configured to use the shared memory pool. A redundant-capable paging space device configured to use the shared memory pool can be accessed by the two paging VIOS partitions. If a paging VIOS partition fails, the redundant-capable paging space device can be accessed through the other paging VIOS partition.

The HMC automatically discovers any available paging VIOS partitions on the destination managed system that are configured to provide paging services to the shared memory pool on the destination system. Use this panel to select whether to have the mobile partition require or attempt to use a redundant paging VIOS configuration from any that are available on the destination management system. Select from the following values:

Required

Select this option to require the mobile partition to use a redundant paging VIOS configuration on the destination system. HMC validation will fail if paging VIOS redundancy cannot be achieved on the destination managed system.

This selection is used primarily when migrating a partition from an existing setup that currently supports redundancy.

None

Select this option to specify that you do not want to configure the migrating partition to use paging VIOS redundancy.

If you are migrating a shared memory partition, the HMC will search for an independent paging space device on the destination managed system. A device that is not configured to support redundant paging VIOS partitions is an independent paging space device. If an independent paging space device is not found, the HMC will then try to find a common paging space device. A device that is configured to support redundant paging VIOS partitions is a common paging space device. If a common paging space device is found, the HMC will use it as an independent paging space device. So the resulting configuration will not use a redundant paging VIOS partition configuration, even though it acquires a common paging space device that is configured to use redundant paging VIOS partitions.

If possible

Select this option to attempt to configure a redundant paging VIOS configuration if one exists. If no redundant configuration is available, the HMC will instead search for and use a paging space device that is not configured to support redundant paging VIOS partitions on the destination managed system.

This panel appears only when you are migrating a logical partition that uses shared memory.