Lenovo ServeRAID M5120, User Manual

Page: 26 / 74

1-8 Overview
•
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 MegaRAID SAS firmware
is stored in flash ROM for easy upgrade.
1.6.1 SAS Features
The following list describes the SAS features of the ServeRAID-M5120
controller:
•
Provides eight fully independent PHYs
•
Supports 6.0 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
1.6.2 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.