LSI 25083 manual SAS Array Limitations, SAS RAID Controller Array Limitations

•Supports STP to enable communication with a SATA II device through an attached expander

•Provides a serial, point-to-point, enterprise-level storage interface

•Simplifies cabling between devices

•Provides a scalable interface that supports up to 240 devices through the use of expanders

Note: The number of devices varies depending on the MegaRAID product. Check the LSI web site (http://www.lsi.com) for specific details about your product.

•Supports wide ports consisting of 2, 3, or 4 PHYs within a single quad port

•Supports narrow ports consisting of a single PHY

•Transfers data using SCSI information units

1.6.2SAS Array Limitations

This section describes the array limitations of the MegaRAID 6Gb/s 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.

Table 1.1 lists the array limitations for the 6Gb/s SAS RAID controllers.

Table 1.1	SAS RAID Controller Array Limitations
		9240-4i	9240-8i	9260-4i	9260-8i	9261-8i	9280 4i/4e	9280-8e
Specification		SAS	SAS	SAS	SAS	SAS	SAS	SAS
Maximum virtual		16	16	64	64	64	64	64
drives per controller
Maximum drive groups		8	8	16	16	16	16	16
per controller
Maximum virtual		16	16	16	16	16	16	16
drives per drive group
Maximum drives per		16	16	32	32	32	32	32
drive group

Summary of SAS RAID Controller Characteristics 1-11

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