NEC Express5800/R110f-1E User Manual download pdf (Page 83)

Creating Logical Drives by "Create Logical Drive - Custom

Mode"

This section describes the information on Logical Drives to be created by "Create Logical Drive - Custom Mode".

RAID Levels

The RAID Level of a Logical Drive which can be created by "Create Logical Drive - Custom Mode" should be

RAID 0, RAID 1, RAID 5, RAID 6, RAID 10, or RAID 50.

Supported RAID Levels vary in RAID Controllers. Unsupported RAID Levels cannot be

selected.

Capacity of Logical Drive

A Logical Drive to be created in the Custom Mode can have any capacity. However, a Logical Drive with the

RAID Level being RAID 10 or RAID 50 must be created by using the entire areas of Physical Devices.

Items set for Logical Drive

The values of other selection items set for a Logical Drive to be created are defined as shown in the table

below.

Selection Item Value

Stripe Size Select a value out of 1KB, 2KB, 4KB, 8KB, 16KB, 32KB, 64KB, 128KB, 256KB, 512KB,

and 1024KB.

Cache Mode Three possible values are as follows:

Auto Switch: Switches the mode automatically between Write Back and Write Through

depending on the existence and/or status of Battery and Flash Backup Unit.

Write Back: Writes data to the cache memory asynchronously.

Write Through: Writes data to the cache memory synchronously.

Initialize Mode Two possible values are as follows:

Full: Initializes both the management and data areas in the Logical Drive.

Quick: Initializes only the management information in the Logical Drive.

Supported Stripe Sizes and cache mode vary in RAID Controllers. Unsupported Stripe Sizes

and cache modes cannot be selected.

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NEC Express5800/R110f-1E User Manual Page 83