HP Disk System 2300 HP StorageWorks Disk System 2300 User's Guide(This manual - Page 27
Topologies, Full Bus Mode
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Product Description Topologies The disk system supports high availability through redundant components and redundant connections to redundant hosts. Each SCSI port on a BCC can be connected to a different host bus adapter in the same or different hosts. Internal mirroring within the disk system is also possible. Basic high availability topologies are described on the following pages. For information about specific supported topologies, consult an HP sales representative. This disk system can hold up to 14 disk modules. The maximum number of disk modules can be installed in either Full Bus Mode or Split Bus Mode. However, host and disk drive addressing must be closely managed. Full Bus Mode The maximum of 14 disk modules can be supported in Full Bus Mode provided there there is only one host bus adapter (HBA) connection and the HBA has the SCSI address of 7. If more than one host connection is required, the slot with the SCSI address corresponding to the SCSI address of the additional host must not have a disk module installed in it to avoid bus contention. For example, if two connections are made to a Disk System 2300 with HBAs having SCSI addresses of 6 and 7, then SCSI ID 6 (slot 7)must not have a disk module installed in it. Note SCSI address 15 should never be used by an HBA when connecting to a Disk System 2300 because this address is reserved on the SCSI bus for the enclosure services microprocessor. Connecting one disk system to redundant hosts achieves system level high availability. A single host bus adapter in each host is connected to a different port in the disk system. With the disk system in full bus mode (switch 1 on), each host can reach all the disks. If the right BCC (viewed from the rear of the disk system) fails in this topology, there is still one path to the disks through BCC B. With the disk system in split bus mode (two internal busses), the Disk System 2300 supports data mirroring between the two internal busses within the same disk system. All connections from the host to the disk system are SCSI LVD cables. Product Description 27