Red Hat Server tc3100 User's Guide download pdf (Page 27)

Product Description 27

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.

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Red Hat Server tc3100 User's Guide Page 27