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ServeRAID M1215 SAS/SATA Controller for IBM System x User’s Guide Chapter 3: ServeRAID M1215 SAS/SATA Controller Characteristics
Characteristics of the ServeRAID M1215 SAS/SATA Controller
3.2.2 Array Performance Features
Table 4 shows the array performance features for the ServeRAID M1215 SAS/SATA controller.
3.2.3 Fault Tolerance
Table 5 lists the fault tolerance features for the ServeRAID M1215 SAS/SATA controller.
3.2.4 Power Supply Requirements for the ServeRAID M1215 SAS/SATA Controller
All power is supplied to the controller 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 voltages. The following states determine
the typical current consumption of the controller:
1. During a hard reset
2. During a disk stress test
3. While sitting idle at the DOS prompt
4. During a disk stress test and deeply discharged Supercap pack.
The supply voltages are 12V ± 8 percent (from PCI edge connector only) and 3.3V ± - 9 percent (from PCI edge
connector only). Table 6 lists the power supply for the controller for each of the three states at the different voltages.
Table 4 Array Performance Features
Specification ServeRAID M1215 AS/SATA Controller
PCI Express Host Data Transfer
Rate
8 GT/s (1 GB/s) per lane
Drive Data Transfer Rate 12.0 Gb/s per lane
Maximum Scatter/Gathers 26 elements
Maximum Size of I/O Requests 6.4 Mbytes in 64 Kbyte stripes
Maximum Queue Tags per Drive As many as the drive can accept
Stripe Sizes 64 Kbyte
Maximum Number of Concurrent
Commands
255
Table 5 Fault Tolerance Features
Specification ServeRAID M1215 SAS/SATA Controller
Support for SMART Yes
Drive Failure Detection Automatic
Drive Rebuild Using Hot Spares Automatic
Parity Generation and Checking Yes
Table 6 Power Supply
PCI Edge Connector State1 State 2 State 3 State 4
3.3V Supply 0.540A 1.08 0.960A 1.08A
+12V Supply 0.780A 1.28A 1.06A 1.78A
3.3V Auxiliary Supply 0.010A 0.010A 0.010A 0.010A
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