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
Benefits of the ServeRAID M1215 SAS/SATA Controller
 Online RAID level migration
 Drive migration
 Drive roaming
 Media scan
 No reboot necessary after expansion
 More than 200 Qtags per array
 User-specified rebuild rate
 32-Kbyte nonvolatile random access memory (NVRAM) for storing RAID system configuration information; the
iMR firmware is stored in flash ROM for easy upgrade.
1.5.1 SAS Features
The following list describes the SAS features of the ServeRAID M1215 controller:
 Provides eight fully independent PHYs
 Supports 12.0 Gb/s SAS data transfers per PHY
 Supports SSP to enable communication with other SAS devices
 Supports SMP to communicate topology management information
 Provides a serial, point-to-point, enterprise-level storage interface
 Simplifies cabling between devices
 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
1.5.2 SAS Array Limitations
This section describes the array limitations of the controller. These include limitations such as the number of physical
disks supported, the maximum number of disks per controller, and the maximum number of virtual disks allowed per
controller.
Table 3 lists the array limitations for the ServeRAID M1215 controller.
Table 3 ServeRAID M1215 SAS/SATA Controller Array Limitations
Specification
ServeRAID M51215
SAS/SATA Controller
Maximum virtual disks per controller 32
Maximum arrays per controller 32
Maximum virtual disks per array 16
Maximum physical devices per array 32
Maximum physical devices per controller
64
NOTE This controller can
support up to 64 devices, but
only 32 devices can be used in
a RAID configuration.
Maximum hot spares per controller 32
Maximum spans per virtual disk 8
Maximum Ports 2

IBM ServeRAID M1215 SAS Specifications

General

Brand	IBM
Model	ServeRAID M1215 SAS
Category	Controller
Language	English