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Appendix C
RAID Controller Considerations
Embedded SATA RAID Controller Considerations
Note the following considerations for controlling front-facing drives (SFF 8-drive server version only):
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Caution
Data migration from software RAID (embedded RAID) to HW RAID (a controller card) is not supported
and could result in data loss. Migrations from software RAID to HW RAID are supported only before
there is data on the drives, or the case in which there are no drives in the server.
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Installing a SATA Interposer Board For Front-Facing Drive Control
The Embedded RAID controller requires a SATA interposer board for front-facing drive control. The
RAID cables included connect from this board to the eight-drive, direct-connect backplane.
To install a SATA interposer board, see
Installing a Software RAID 5 Key Module for Embedded RAID 5 Support
The software RAID 5 key module contains a chip on a small circuit board. This module attaches to a
two-pin motherboard header. This chip upgrades support to add embedded SATA RAID 5 support for
front-facing drive control.
To install a RAID 5 key module, see
OL-32474-01
The default setting for this embedded controller hub is SATA RAID 0, 1, and 10 support for up to
eight front-facing SATA drives.
You can upgrade to SATA RAID 0, 1, 5, and 10 support for up to eight front-facing SATA drives (in
two groups of four drives) by installing a RAID 5 key module on the motherboard. See
Software RAID 5 Key Module for Embedded RAID 5 Support, page
When you order the server with this embedded controller, the controller is enabled in the BIOS.
Instructions for enabling the controller are included for the case in which a server is reset to defaults
(Disabled). See
Enabling the Embedded RAID Controller in the BIOS, page
You cannot downgrade from using a HW RAID controller card to using the software RAID
embedded controller for front-facing drive control.
The required drivers for this controller are already installed and ready to use with the LSI software
RAID Configuration Utility (legacy version or UEFI via the server BIOS). However, if you will use
this controller with Windows or Linux, you must download and install additional drivers for those
operating systems. See
Installing LSI MegaSR Drivers For Windows and Linux, page
Replacing a SATA Interposer Board, page
Replacing a Software RAID 5 Key Module, page
Cisco UCS C240 M4 Server Installation and Service Guide
Embedded SATA RAID Controller
Installing a
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