H3C UniServer R4900 G3 Series - Page 33

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Drive backplane
and drive
expander module
Drive configuration Storage controller
NVMe SSD
expander module
BP2-25SFF-2U-G3
25SFF drive
backplane
25SFF
(25 front SFF SAS/SATA
drives)
• Mezzanine
• Standard in PCIe slot 6
N/A
27SFF
(25 front SFF SAS/SATA
drives + 2 rear SFF
SAS/SATA drives)
• Mezzanine
• Standard in PCIe slot 6
The rear drives must be
connected to the drive
backplane.
N/A
NOTE:
The BP2-25SFF-2U-G3 25SFF drive backplane provides the function of a drive expander module
and can be used without any drive expander module.
These drive configurations use different drive numbering schemes, as shown in Table 17.
Table 17 Drive numbering schemes (25SFF server)
Drive configuration Drive numbering
25SFF (25 SFF front drives) See Figure 18.
27SFF (25 SFF front drives and 2 SFF rear drives) See Figure 19.
29SFF (25 SFF front drives and 4 SFF rear drives) See Figure 20.
29SFF+2LFF (25 SFF front drives, 4 SFF rear drives, and 2
LFF rear drives)
See Figure 21.
Figure 18 Drive numbering for the 25SFF configuration (25SFF server)
Figure 19 Drive numbering for the 27SFF (25 front+2 rear) drive configuration (25SFF server)