Network Attached Storage User's Reference

Chapter 4. Storage configuration

This chapter gives the details for setting up and configuring the NAS 200 storage.

ServeRAID configuration

This section gives details on configuring the ServeRAID adapter.

RAID technology

RAID technology allows you to group several physical drives into an array that you

can define as one or more logical drives. Each logical drive appears to the

operating system as a single drive. This grouping technique greatly enhances

logical-drive capacity and performance beyond the physical limitations of a single

physical drive.

For an overview of RAID technology, see Chapter 3 ″Understanding RAID

technology″ in the ServeRAID-4x Ultra160 SCSI Controller publication, which is

included on the Documentation CD that came with your appliance.

Table 2 shows the standard features of the ServeRAID-4Lx and ServeRAID-4H.

Table 2. Standard features of ServeRAID-4Lx and ServeRAID-4H

Feature ServeRAID-4Lx (Model 201) ServeRAID-4H (Model 226)

Arrays (maximum) 8 8

Battery-backup cache No Yes

Cache memory 16 MB 128 MB

Logical drives (maximum) 8 8

SCSI channels 1 4

SCSI transfer speed

(maximum)

160 MB/sec 160 MB/sec

Supported RAID levels 0, 1, 5, Enhanced-1 (1E),

and Enhanced-5 (E5), 00, 10,

1E0, 50

0, 1, 5, Enhanced-1 (1E) and

Enhanced-5 (E5), 00, 10,

1E0, 50

System PCI data bus 64–bit at 33 MHz 64–bit at 33 MHz

Updating the ServeRAID BIOS, firmware, and device drivers

The NAS 200 preloaded software ships with the required BIOS, firmware and

device drivers. You do not need to load or update any of these items. Should

replacement software be required, it will be available online as described in the

Storage Unit Installation and User’s Guide GA27-4259.

Attention: Because the NAS 200 hardware and software is preconfigured as a

high-performance network-attached storage appliance, you should not update the

BIOS, firmware, or device drivers using the procedures described in the

ServeRAID-4x Ultra160 SCSI Controller publication.

Functionality not needed and not supported in the NAS 200

Because the ServeRAID hardware and software is used in several IBM products,

note that the ServeRAID-4x Ultra160 SCSI Controller publication refers to the

following items that are not applicable and not supported on the NAS 200: