Cisco Cisco UCS B440 M1 High-Performance Blade Server Scheda Tecnica

The UCS B420 M4 can be ordered with or without the Cisco FlexStorage RAID controller with disk 
drive bays (local storage subsystem).

There is no RAID or local storage controller or drive bays included (embedded) with the B420 M4 
server. Therefore, the Cisco FlexStorage RAID controller with drive bays must be purchased in 
order to support any (1, 2, 3, or 4) local hard disk drives (HDDs) or solid state drives (SSDs). The 
Cisco FlexStorage RAID controller option includes drive bays one and two, and supports RAID 
0,1,10. An optional passthrough module includes drive bays three and four. 

For servers that do not need any local HDDs or SSDs (for example, for booting from SAN), you can 
order the server without the Cisco FlexStorage RAID controller with disk drive bays; however be 
sure to keep Cisco FlexStorage blanking panels installed to maintain proper cooling airflow.

The ordering information is listed in 

See 

 for a top view of the B420 M4 server with and without the Cisco 

FlexStorage SAS RAID controller and drive bays. See 

 for a front view of 

these configurations. When no drive bays are installed, blanking panels must be installed.

UCSB-MRAID12G

1

1. The UCSB-MRAID-12G RAID controller runs iMegaRAID, which has a lower-capability software stack, provides 

RAID 0/1 levels, and has no support for caching. Note that you cannot upgrade from this RAID controller to the 
to UCSB-MRAID12G-HE RAID controller.

Cisco FlexStorage 12G SAS RAID controller with drive bays

UCSB-MRAID12G-HE

2, 3,

 

4

2. The UCSB-MRAID12G-HE RAID controller runs a MegaRAID fully-featured software stack, has access to cache, 

and is recommended for VSAN. Its queue depth is much higher than that of the UCSB-MRAID-12G. Supports RAID 
0/1/5/6 levels. Note that you cannot upgrade to this RAID controller from the UCSB-MRAID-12G controller

3. The B420 M4 with the UCSB-MRAID12G-HE requires UCSM 2.2(6) or later
4. The flash-backed write cache provides RAID controller cache protection using NAND flash memory and a 

supercapacitor. In the event of a power or server failure, cached data is automatically transferred from the 
RAID controller DRAM write cache to flash. Once power is restored, the data in the NAND flash is copied back 
into the DRAM write cache until it can be flushed to the disk drives.

Cisco FlexStorage 12G SAS RAID controller with 2 GB flash-backed write 

cache and drive bays

UCSB-LSTOR-PT

Passthrough module with drive bays

UCSB-LSTOR-BK

Cisco FlexStorage blanking panel w/o controller, w/o drive bays