4.2Configuration on Disk

Configuration on Disk (drive roaming) saves configuration information both in nonvolatile random access memory (NVRAM) on the MegaRAID SCSI 320-1, and on the disk drives controlled by the MegaRAID SCSI 320-1. If the MegaRAID SCSI 320-1 is replaced, the new MegaRAID SCSI 320-1 controller can detect the actual RAID configuration, maintaining the integrity of the data on each drive, even if the drives have changed channel and/or target ID.

4.3Configuration Features

Table 4.1 contains the configuration features for the MegaRAID 320-1.

Table 4.1

Configuration Features

 

 

 

 

 

Specification

 

 

Feature

 

 

 

 

RAID levels

 

 

0, 1, 5, 10, and 50

 

 

 

SCSI channels

 

1

 

 

 

Maximum number of drives per channel

 

15

 

 

 

Array interface to host

 

PCI 2.2

 

 

 

Drive interface

 

Fast and Wide, Ultra320 single-

 

 

 

ended and low-voltage differential

 

 

 

(LVD)

 

 

 

Upgradeable cache size

 

Cache memory onboard

 

 

 

Cache function

 

Write-through, write-back, adaptive

 

 

 

read-ahead, no read-ahead, read-

 

 

 

ahead

 

 

 

Multiple logical drives/arrays per

 

Up to 40 logical drives per controller

controller

 

 

 

 

 

 

Maximum number of MegaRAID SCSI

 

12

320-1 controllers per system

 

 

 

 

 

Online capacity expansion

 

Yes

 

 

 

Hot spare support

 

Yes

 

 

 

 

4-2Features

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