Edit Policies window

Allow Simultaneous Creation of LDEVs

Whether LDEVs are automatically created in the external volume:

• Yes: LDEVs are automatically created.
• No: LDEVs must be created manually.

Use External Storage System Configuration

Whether the external volume's configuration for the LDEVs is used:

• Yes: Configuration is used if Yes is specified in Allow Simultaneous Creation of LDEVs.
• No: Configuration is not used. LDEVs must be configured manually.

Base Emulation Type (VSP 5000 series)

External system's emulation type. All supported emulation types except OPEN-L can be specified. See External volume policy settings and functions for more information.

Number of LDEVs per External Volume

Number of LDEVs to be created in the local system when the volume is mapped. Depends on the base emulation type (VSP 5000 series) or capacity of the external volume (VSP E series).

Cache Partition

CLPR for accessing the external volume

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.

Load Balance Mode

I/O load balance system for external storage system:

• Normal Round-robin: Load balance is performed in round-robin system. This is the default.
• 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.

MP Unit ID

MP unit ID for the external volume:

• Auto (default): Unit is automatically selected by the system.
• If Auto cannot be selected, the unit with the lowest number is the default.