Cache Mode

• Enable: Write data from the host is propagated asynchronously.
• Disable: Write data from the host is propagated synchronously.

See the planning topic in the Universal Volume Manager User Guide for more information.

Inflow Control

• Enable: Limits or prevents write data from being written to cache memory when the write operation cannot be performed.
• Disable: Allows write data to be written to cache when the write operation cannot be performed.

Use ALUA as Path Mode

Select whether ALUA is used as the Path Mode.

• Enable: Enables ALUA mode.
• Disable: Disables ALUA mode.

The value that is set for the selected external volume is used as the default. If two or more external volumes with different values are selected, the item is placed in non-selected status. If the ALUA mode cannot be set for the selected external volume, Enable cannot be selected.

Load Balance Mode

Select I/O load balance system for external storage system.

• Normal Round-robin: Performs load balance in round-robin system.
• Extended Round-robin: Load balance system is automatically switched for sequential I/O and random I/O.
• Disable: Performs I/O operation with a single path, without load balance.

The value that is set for the selected external volume is used as the default. If two or more external volumes with different values are selected, the item is placed in non-selected status.