Adaptec 2200S - SCSI RAID Controller Guide d'installation télécharger pdf (Page 36)

3-5

Installing the Driver

New Installations

For new installations of any of the operating systems supported, it

is possible, if not desirable, to install the operating system on an

array. This provides a more robust system when using a redundant

array, since failure of a drive won’t cause the system to stop

running.

Any such installation requires that the redundant array be created

prior to installing the operating system. Adaptec SCSI RAID

controllers provide two ways to do this, by starting (also called

booting) the system using the Adaptec CD, or by using the tools

built into the on-board firmware on the controller.

It is beyond the scope of this presentation as to which RAID type to

use for this application. But, since the user may want some

guidance, the following condensed table may offer help. For more

details, consult external resources detailing relative performance

vs. desirable characteristics for the various RAID types.

RAID

Type

Minimum

Number

of Drives

Properties

Not redundant - do not use RAID 0 for this

application if you want the protection afforded

by redundancy.

1 2 only Fast writes and reads, equivalent to the transfer

rate of the constituent drives.

5 3 Comparable read speed but rather slow write

speed compared to constituent drives.

10 4 Requires multiples of 2, starting with 4. Provides

the speed of a RAID 0 with the redundant

protection of a RAID 1.

50 6 Requires a minimum of 6 drives. Provides greater

efficiency in drive usage than a RAID 10.

1 2 ... 31 32 33 34 35 36 37 38 39 40 41 ... 66 67

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Adaptec 2200S - SCSI RAID Controller Guide d'installation Page 36