LSI 25083 manual Electrical Characteristics, Fault Tolerance Features

Table 3.8	Array Performance Features (Cont.)
		MegaRAID SAS 9240, SAS 9260, SAS
Specification		9261, and SAS 9280 RAID Controllers
Maximum queue tags per drive		As many as the drive can accept
Stripe sizes		8 Kbytes, 16 Kbytes, 32 Kbytes, 64 Kbytes,
		128 Kbytes, 256 Kbytes, 512 Kbytes, or
		1 Mbyte
Maximum number of concurrent		255
commands

3.3.3Fault Tolerance

Table 3.9 lists the fault tolerance features for the MegaRAID 6Gb/s SAS RAID controllers.

Table 3.9 Fault Tolerance Features

	MegaRAID SAS 9240, SAS 9260, SAS 9261,
Specification	and SAS 9280 RAID Controllers
Support for SMART1	Yes
Drive failure detection	Automatic
Drive rebuild using hot spares	Automatic
Parity generation and checking	Yes

1.The Self Monitoring Analysis and Reporting Technology (SMART) detects up to 70 percent of all predictable drive failures. In addition, SMART monitors the internal performance of all motors, heads, and drive electronics.

3.3.4Electrical Characteristics

This subsection provides the power supply requirements for the

MegaRAID 6Gb/s SAS RAID controllers.

3.3.4.1Power Supply Requirements for SAS 9240 RAID Controllers

All power is supplied to the SAS 9240 RAID controllers through the PCI Express 3.3V rails and the 12V rail. Onboard switching regulator circuitry operating from the 3.3V rails and the 12V rail provide the necessary

Technical Specifications 3-17

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