Red Hat Server tc3100 User's Guide download pdf (Page 19)

Product Description 19

Product Description

BCCs and BCC Filler Panels

BCCs (Bus Control Cards) plug into two slots in the back of the disk system.

Each BCC connects to both LVD (low voltage differential) buses inside the disk

system. In full bus mode (DIP switch 1 set to “|”), both BCCs have access to all

installed disks. The two SCSI buses are bridged. If either BCC fails and LVM

primary and alternate paths are defined, data can be accessed through the other

BCC. In split bus mode (DIP switch 1 set to “0”), the left BCC (as viewed from

the rear of the disk system), is on the high numbered bank (with disk slots 8, 9,

10, 11,12, 13, and 14) and the right BCC is on the low numbered bank (with disk

slots 0, 1, 2, 3,4, 5, and 6) of disk slots. See Figure 1.

Two SCSI ports (B in Figure 4) on each BCC provide dual LVD connections to

the same or separate hosts. If a host is connected to one of the BCC ports, an

LVD terminator must be connected to the other port on that BCC.

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Red Hat Server tc3100 User's Guide Page 19