LSI MegaRAID SAS 9286-8e User's Guide download pdf (Page 13)

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6Gb/s MegaRAID SAS RAID Controllers User Guide

August 2012

Chapter 1: Overview

Summary of 6Gb/s MegaRAID SATA+SAS RAID Controller Characteristics

 They provide a scalable interface that supports up to 240 devices through the use of expanders.

 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 6Gb/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 6Gb/s MegaRAID SATA+SAS RAID controllers.

The maximum numbers in the previous table depend on how many physical devices you have connected to the RAID

controller. For example, the maximum number of drive groups is equal to the number of drives that are supported by

the controller. Thus, for the MegaRAID SAS 9240-4i RAID controller, the maximum number of drive groups per

controller is 16, which is based on the maximum number of physical devices that you can connect. In addition, the

maximum number of hot spares per controller is equal to the maximum number of drives per controller.

Although you can have up to 16 virtual drives per drive group, and up to 128 drive groups on most of the controllers,

a limit of 64 virtual drives exists on those controllers.

These RAID controllers support 64-bit logical block addressing (LBA), which makes it possible to connect a large

number of drives to the RAID controller, directly and through expanders. However, the actual number of drives that

you can attach depends on the limits listed in this table rather than by actual RAID volume capacity.

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.

Table 1 6Gb/s MegaRAID SATA+SAS RAID Controllers Array Limitations

Specification

SAS 9240-4i

SAS 9240-8i

SAS 9260-4i

SAS 9260CV-4i

SAS 9260-8i

SAS 9260CV-8i

SAS 9260DE-8i

SAS 9260-16i

SAS 9261-8i

SAS 9265-8i

SAS 9265CV-8i

SAS 9265-8i

SAS 9270-8i

SAS 9266-4i

SAS 9271-4i

SAS 9266-8i

SAS 9271-8i

SAS 9271-8iCC

SAS 9280 4i4e

SAS 9280-8e

SAS 9280DE-8e

SAS 9280-16i4e

SAS 9280-24i4e

SAS 9285-8e

SAS 9285CV-8e

SAS 9286-8e

SAS 9286CV-8e

SAS 9286CV-8eCC

Maximum virtual drives per controller 16 16 64 64 64 64 64 64 64 64 64 64 64 64 64

Maximum drive groups per controller 16 16 128 128 128 128 128 128 128 128 128 128 128 128 128

Maximum virtual drives per drive group1616 16 16 1616 16 16 16 1616161616 16

Maximum drives per drive group 1616 32 32 3232 32 32 32 3232323232 32

Maximum drives per controller

a. These controllers can support up to 64 devices, but only 16 can be used in a RAID configuration.

128 128 128 128 128 128 128 240 240 240 240 240 240

Maximum hot spares per controller

128 128 128 128 128 128 128 240 240 240 240 240 240

Maximum spans per virtual drive 88 8 8 88 8 8 8 88888 8

Maximum enclosures per port

b. The number assumes one storage enclosure processor (SEP) per enclosure.

2 2 2 2 10 2 2 2 2 10 10 2 10 10 10

Number of port connectors 12 1 2 42 2 1 2 22257 2

1 2 ... 8 9 10 11 12 13 14 15 16 17 18 ... 91 92

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