IBM ServeRAID M1215 SAS User Manual

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ServeRAID M1215 SAS/SATA Controller for IBM System x User’s Guide Chapter 1: Overview
Configuration Scenarios
1.3 Configuration Scenarios
There are two main scenarios in which you can use this ServeRAID controller:
 Low-end, internal SATA configuration: In this configuration, use the ServeRAID controller as a high-end SATA
compatible controller that connects to several SATA disks. This type of configuration is mostly for low-end or entry
level servers. Enclosure management is provided through out-of-band I2C bus. Side bands of both types of
internal SAS connectors support the SFF-8485 and SFF-8448 (SGPIO) interface.
 Midrange, internal SAS configuration: This configuration is like the internal SATA configuration, but with high-end
disks. This type of configuration is more suitable for low-range to midrange servers.
The following figure shows a direct-connect configuration. The Inter-IC (I2C) interface communicates with peripherals.
The external memory bus provides a 16-bit memory bus, parity checking, and chip select signals for pipelined
synchronous burst static random access memory (PSBRAM), nonvolatile static random access memory (NVSRAM), and
Flash ROM.
Figure 1 Example of a SAS Direct Connect Application
NOTE MegaRAID does not allow virtual drives of different RAID levels, such as RAID 0 and RAID 5, in the same
array. For example, if an existing RAID 5 virtual drive is created out of partial space in an array, the next virtual
drive in the array has to be RAID 5 only.
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IBM ServeRAID M1215 SAS Specifications

General

Brand	IBM
Model	ServeRAID M1215 SAS
Category	Controller
Language	English