IBM System x3650 M4 Product Manual page 56

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 ServeRAID M5120 SAS/SATA Controller has the following specifications:
Eight external 6 Gbps SAS/SATA ports

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

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 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 controller external
port. For better performance, distribute expansion enclosures evenly across both controller ports.
Table 26. IBM System Storage external expansion enclosures
Part number Description
174712X IBM System Storage EXP2512 Express
174724X IBM System Storage EXP2524 Express
IBM System x3650 M4
Maximum quantity supported per
one controller
18
9
56