Configuration on Disk

Configuration on Disk (drive roaming) saves configuration information both in NVRAM on MegaRAID and on the disk drives connected to MegaRAID. If MegaRAID is replaced, the new MegaRAID 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.

Hardware Requirements

MegaRAID can be installed in an IBM AT®-compatible or EISA computer with a motherboard that has PCI expansion slots. The computer must support PCI version 2.1 or later. The computer should have an Intel Pentium or more powerful CPU, a floppy drive, a color monitor and VGA adapter card, a keyboard, and mouse.

Configuration Features

 

Specification

Feature

 

 

RAID Levels

0, 1, 3, 5, 10, 30, and 50

 

 

SCSI Channels

4

 

 

Maximum number of drives per channel

15

 

 

Array interface to host

64-bit PCI

 

 

PCI bus master

Supports write invalidate

 

 

Drive interface

Wide 160M

 

 

Upgradable cache memory sizes

16 MB, 32 MB, 64 MB, or 128

 

 

 

MB,

 

 

Cache Function

Write-through, write-back, ARA,

 

 

 

NRA, RA

 

 

Multiple logical drives/arrays per controller

Up to 40 logical drives per controller

 

 

Maximum number of MegaRAID

12

 

 

controllers per system

 

 

 

Online capacity expansion

Yes

 

 

Dedicated and pool hot spare

Yes

 

 

Flashable firmware

Yes

 

 

Hot swap devices supported

Yes

 

 

Non-disk devices supported

Yes

 

 

Mixed capacity hard disk drives

Yes

 

 

Number of 16-bit internal SCSI connectors

2

 

 

Number of external SCSI connectors

4

 

 

Support for hard disk drives with capacities

Yes

 

 

of more than 8 GB

 

 

 

Clustering support (Failover control)

Yes

 

 

Online RAID level migration

Yes

 

 

RAID remapping

Yes

 

 

No reboot necessary after expansion

Yes

 

 

More than 200 Qtags per physical drive

Yes

 

 

Hardware clustering support on the board

Yes

 

 

User-specified rebuild rate

Yes

 

 

 

 

 

26MegaRAID Enterprise 1600 Hardware Guide