User manual

Phase 2: Setting up with the Web browser

Cobalt RaQ XTR User Manual 27

RAID Setup

On this screen, you choose the type of RAID that you want to implement on the

RaQ XTR server. If the RaQ XTR has only one hard disk drive, this screen does

not appear.

The RaQ XTR offers three different levels RAID (depending on the conﬁguration

of the server), each with its own advantages and disadvantages:

• RAID-0 combines the separate hard disk drives into one virtual disk drive

and offers the best performance of the three options. However, the data on

the disk drives is not redundant and the system is thus not fault-tolerant. This

option is available on server conﬁgurations with two or more hard disk

drives.

• RAID-1, also known as disk mirroring, consists of a primary hard disk drive

and a secondary hard disk drive; the secondary disk drive is an exact copy or

“mirror image” of the primary disk drive. This option is only available on a

conﬁguration with two hard disk drives.

• RAID-5 includes a rotating parity-bit array. All read and write operations

can be overlapped. RAID-5 does not store redundant data but it does store

the parity information which can be used to reconstruct data in the event of a

single hard-disk-drive failure. RAID-5 requires at least three hard disk drives

for the array.

If the RaQ XTR has two, three or four hard disk drives, Figure 13 appears.

• RAID-0 requires at least two hard disk drives.

• RAID-1 (disk mirroring) is only available on a conﬁguration with two hard

disk drives.

• RAID-5 requires at least three hard disk drives.

Click the radio button next to the type of RAID you want to implement.

Click the right arrow at the bottom to continue.

☞

Important: The RaQ XTR Administrator can set the level of RAID

only through the Setup Wizard.

Once the Setup Wizard process is complete, the level of RAID

cannot be changed unless the system is returned to a factory-fresh

state using an OS restore CD.