HP Surestore Disk Array FC60 HP SureStore E Disk Array FC60 - (English) Advanc - Page 178
Full-Bus/Split-Bus Switch 1 Configuration, Setting
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Table 24 Disk Enclosure Switches Switch Setting Operation 1 - Full-/Split Bus Mode 2 - Stand-Alone/Array Mode 3 - Bus Reset on Power Fail 4 - High/Low Bus Addressing 5 - Not Used 1 Full-Bus Mode 0 Split-Bus Mode 0 Always set to Off (Array Mode) 0 Must be set to 0 0 Set to 0 (Low addressing) 0 Not used; must be set to 0 Full-Bus/Split-Bus (Switch 1) Configuration The disk enclosure's internal bus connects the disk drives together and to the BCCs. This bus can be set for two modes of operation: full-bus or split-bus mode. When switch 1 is set to Full Bus (1), all ten disk can be accessed together on a single SCSI bus. In this mode, one SCSI channel from the FC60 controller is connected to all ten disk modules through either BCC (typically BCC A). Note In full bus mode, all ten disks can be accessed through either BCC. However, internally each BCC still manages five disks. This means that if the BCC that is not connected to a SCSI channel fails, access to its five disks will be lost. Failure of the BCC that is connected to a SCSI channel will render all ten disks inaccessible. When switch 1 is set to 0 (split-bus mode), the disk enclosure is split into two separate buses with five disks to each bus. In split-bus mode, each bus is controlled by a separate BCC. BCC A (the top BCC) controls the even drive slots (0, 2, 4, 6, 8) and BCC B (the bottom BCC) controls the odd bus slots (1, 3, 5, 7, 9). In split-bus mode, two SCSI channels are connected to the disk enclosure, one to a SCSI connector on BCC A and a second a SCSI connector on BCC B. Each slot in the disk enclosure is assigned a SCSI ID. A range of IDs is assigned to the odd disk slots, and a different range to the even slots (see Table 25). The two ID ranges include 178 Configuration Switches