Edit External Volumes window

Cache Mode

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

See Cache use and external storage performance for more information.

Inflow Control

• Enable: Write data is limited or prevented from being written to cache memory when the write operation cannot be performed.
• Disable: Write data is allowed to be written to cache when the write operation cannot be performed.

Use ALUA as Path Mode

Whether ALUA is used as the Path Mode:

• Enable: ALUA mode is enabled.
• Disable: ALUA mode is disabled.

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

I/O load balance system for external storage system:

• Normal Round-robin: Load balance is performed in round-robin system.
• Extended Round-robin: Load balance system is automatically switched for sequential I/O and random I/O.
• Disable: I/O operation is performed 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.