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IBM X3850 X6
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82 IBM System x3850 X6 and x3950 X6 Planning and Implementation Guide
The ServeRAID M5120 SAS/SATA Controller has the following specifications:
򐂰 Eight external 6 Gbps SAS/SATA ports
򐂰 Up to 6 Gbps throughput per port
򐂰 Two external x4 mini-SAS connectors (SFF-8088)
򐂰 Supports RAID 0, 1, and 10
򐂰 Supports RAID 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 or 1 GB flash-backed cache
򐂰 PCIe 3.0 x8 host interface
򐂰 Based on the LSI SAS2208 6 Gbps ROC controller
򐂰 Supports connectivity to the EXP2512 and EXP2524 storage expansion enclosures
The ServeRAID M5120 SAS/SATA Controller supports connectivity to the IBM System
Storage external expansion enclosures listed in Table 3-15. Up to nine expansion enclosures
can be daisy-chained per one M5120 external port. For better performance, distribute
expansion enclosures evenly across both M5120 ports.
Table 3-15 IBM System Storage external expansion enclosures
The external SAS cables listed in the following Table 3-16 support connectivity between
external expansion enclosures and the ServeRAID M5120 SAS/SATA Controller.
Table 3-16 External SAS cables for external storage expansion enclosures
For more information, see the IBM Redbooks Product Guide, ServeRAID M5120 SAS/SATA
Controller for IBM System x, available at this website:
http://www.redbooks.ibm.com/abstracts/tips0858.html?Open
Part number Description Maximum quantity
supported per one
M5120
174712X IBM System Storage EXP2512 Express 18
174724X IBM System Storage EXP2524 Express 9
Part number Description Maximum quantity
supported per one
enclosure
39R6531 IBM 3 m SAS Cable 1
39R6529 IBM 1 m SAS Cable 1

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