IBM System x3550 M4 Product Guide

IBM System x3550 M4 44
The ServeRAID M5120 SAS/SATA Controller has the following specifications:
Eight external 6 Gbps SAS/SATA portscool

Two external x4 mini-SAS connectors (SFF-8088)

Supports RAID levels 0, 1, and 10

Supports RAID levels 5 and 50 with optional M5100 Series RAID 5 upgrades

Supports RAID 6 and 60 with the optional M5100 Series RAID 6 Upgrade

Supports 512 MB battery-backed cache or 512 MB or 1 GB flash-backed cache

Up to 6 Gbps throughput per port

PCIe x8 Gen 3 host interface

Based on the LSI SAS2208 6 Gbps ROC controller

Supports connectivity to the EXP2512 and EXP2524 storage expansion enclosures

For more information, see the IBM Redbooks® Product Guide ServeRAID M5120 SAS/SATA Controller
for IBM System x at:
http://www.redbooks.ibm.com/abstracts/tips0858.html?Open
The ServeRAID M5225 SAS/SATA Controller has the following specifications:
Eight external 12 Gbps SAS/SATA ports

Supports 12, 6, and 3 Gbps SAS and 6 and 3 Gbps SATA data transfer rates

Two external x4 mini-SAS HD connectors (SFF-8644)

Supports 2 GB flash-backed cache (standard)

Supports RAID levels 0, 1, 5, 10, and 50 (standard)

Supports RAID 6 and 60 with the optional M5200 Series RAID 6 Upgrade

Supports optional M5200 Series Performance Accelerator and SSD Caching upgrades

PCIe x8 Gen 3 host interface

Based on the LSI SAS3108 12 Gbps ROC controller

Supports connectivity to the EXP2512 and EXP2524 storage expansion enclosures

The controllers support connectivity to the IBM System Storage external expansion enclosures listed in
the following table. Up to nine expansion enclosures can be daisy-chained per one external controller
port. For better performance, distribute expansion enclosures evenly across both ports of a controller.
Table 23. IBM System Storage external expansion enclosures
Part number Description Maximum quantity supported per
one controller
174712X IBM System Storage EXP2512 Express 18
174724X IBM System Storage EXP2524 Express 9

IBM System x3550 M4 Specifications

General

Brand	IBM
Model	System x3550 M4
Category	Server
Language	English