Storage Controller Card Firmware Compatibility; Raid Backup (Supercap); Write-Cachepolicyforcisco12Gsasmodularraidcontrollers - Cisco UCS C480 M5 Installation And Service Manual

Storage Controller Card Firmware Compatibility

Cisco 12G Modular Rear RAID
Controller
UCSC-SAS9460-8i
Includes 2-GB cache; controls up to
8 internal drives in the rear drive-bay
module.
Storage Controller Card Firmware Compatibility
Firmware on the storage controller must be verified for compatibility with the current Cisco IMC and BIOS
versions that are installed on the server. If not compatible, upgrade or downgrade the storage controller
firmware using the Host Upgrade Utility (HUU) for your firmware release to bring it to a compatible level.
See the HUU guide for your Cisco IMC release for instructions on downloading and using the utility to bring
server components to compatible levels:

RAID Backup (Supercap)

This server supports installation of up to two supercap units. The front supercap unit backs up the front RAID
controller for front-loading drives. The rear supercap unit backs up the optional, rear RAID controller for
internal auxiliary drives.
The supercap provides approximately three years of backup for the disk write-back cache DRAM in the case
of a sudden power loss by offloading the cache to the NAND flash.
For supercap unit replacement instructions, see

Write-CachePolicyforCisco12GSASModularRAIDControllers

For this server and other Cisco Generation M5 servers, the default write-cache policy for the Cisco Modular
RAID controllers is Write Through (irrespective of the presence of a charged supercap or "good BBU"). This
utilizes the optimal performance characteristics of the controller.
The write policy can be set to Write Back, if preferred. You can set the write policy using the following
methods:
• For standalone servers, use the Cisco IMC interface to set Virtual Drive Properties > Write Policy. See
• For Cisco UCS-integrated servers, use the Cisco UCS Manager interface to set the write-cache policy
• Use the LSI Option ROM Configuration Utility.
Cisco UCS C480 M5 Server Installation and Service Guide
134
8 internal SAS/SATA
drives in the rear drive-bay
module
the "Managing Storage Adapters" section in your Cisco IMC Configuration Guide.
Cisco IMC GUI and CLI Configuration Guides
as part of virtual drive configuration in your storage profile.
Cisco UCS Manager Configuration Guides
0, 1, 5, 6, 10, Yes
50, 60
HUU Guides.
Replacing the Front RAID Supercap Unit, on page
Storage Controller Considerations
Rear RAID cable
CBL-AUX-SAS-M5
68.