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CONFIGURING the SERVER
STEP 4
CHOOSE RAID CONTROLLER AND DISK DRIVE BAYS
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
Table 9 Card Cage and RAID Ordering Options
Product ID (PID)
UCSB-MRAID12G
1
2, 3, 4
UCSB-MRAID12G-HE
UCSB-LSTOR-PT
UCSB-LSTOR-BK
Notes
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.
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.
See
Figure 4 on page 17
FlexStorage SAS RAID controller and drive bays. See
these configurations. When no drive bays are installed, blanking panels must be installed.
16
Table
PID Description
Cisco FlexStorage 12G SAS RAID controller with drive bays
Cisco FlexStorage 12G SAS RAID controller with 2 GB flash-backed write
cache and drive bays
Passthrough module with drive bays
Cisco FlexStorage blanking panel w/o controller, w/o drive bays
for a top view of the B420 M4 server with and without the Cisco
11.
Figure 5 on page 17
Cisco UCS B420 M4 Blade Server
for a front view of
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