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LSI Corporation

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12Gb/s MegaRAID SAS RAID Controllers User Guide

April 2014

Chapter 1: Overview

Summary of 12Gb/s MegaRAID SATA+SAS RAID Controller Characteristics

 Advanced array configuration and management utilities offer these capabilities:

— Online capacity expansion to add space to an existing drive or a new drive

— Online RAID level migration

— Drive migration

— Drive roaming

— No reboot necessary after expansion

— Load balancing

— Media scan

 User-specified rebuild rate (specifying the percentage of system resources to use from 0 percent to 100 percent)

 NVSRAM of 32 KB for storing RAID system configuration information; the MegaRAID SAS firmware is stored in

flash ROM for easy upgrade.

1.6.1 SAS Features

The 12Gb/s MegaRAID SATA+SAS RAID controllers support the following SAS features:

 They provide four fully independent PHYs or eight fully independent PHYs, depending on the controller.

 They support 12Gb/s, 6Gb/s, and 3Gb/s SAS data transfers per PHY.

 They support SMP to communicate topology-management information.

 They support SSP to enable communication with other SAS devices.

 They support STP to enable communication with SATA devices through an attached expander.

 They provide a serial, point-to-point, enterprise-level storage interface.

 They simplify cabling between devices.

 They provide a scalable interface that supports up to 255 devices through the use of expanders.

NOTE The number of devices varies depending on the MegaRAID product.

Check the LSI website, http://www.lsi.com, for specific details about

your product.

 They support wide ports that consist of two, three, or four PHYs within a single quad port.

 They support narrow ports consisting of a single PHY.

 They transfer data by using SCSI information units.

1.6.2 SAS Array Limitations

This section describes the array limitations of the 12Gb/s MegaRAID SATA+SAS RAID controllers. These limitations

include the number of drives supported per controller, the maximum number of drives per controller, and the

maximum number of virtual drives allowed per controller.

The following table lists the array limitations for the 12Gb/s MegaRAID SATA+SAS RAID controllers.

Table 1 12Gb/s MegaRAID SATA+SAS RAID Controllers Array Limitations

Specification

MegaRAID SAS

9341-4i Controller

MegaRAID SAS

9341-8i Controller

MegaRAID SAS

9361-4i Controller

MegaRAID SAS

9361-8i Controller

MegaRAID SAS

9380-4i4e

Controller

MegaRAID SAS

9380-8e Controller

Maximum virtual drives per controller 32 64 64 64

Maximum drive groups per controller 32 128 128 128

Maximum virtual drives per drive group 16 16 16 16

Maximum drives per drive group 32 32 32 32

1 2 ... 5 6 7 8 9 10 11 12 13 14 15 ... 42 43

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