Compaq 295242-B21 - RAID Controller - UW SCSI 40 MBps Configurations page 9

Up to 2 Fibre Channel Tape Controllers
Maximum of 1 TL895 library
Up to 7 tape drives
Maximum of 1 switch hop between servers and a tape controller
Supports backup for up to 2 RA8000 or 1 ESA12000 (4 controller pairs) storage systems
Compaq Secure Path for Windows NT Rules
All High Availability Multiple-Bus Failover configurations require Compaq Secure Path for
Windows NT (minimum revision v2.2) and two physical paths to a pair of controller ports on the
storage system
One instance of the Secure Path Manager can control two paths on up to 4 storage systems. Two
Paths equates to 2 FC HBA's connected to 2 controller host ports (i.e., Port 1 of Controller A and
Port 1 of Controller B). Another instance is required to control two paths to the other pair of ports
on a storage system (Port 2 of Controller A and Port 2 of Controller B)
For standalone servers (non-cluster), a separate instance of the Secure Path Manager is run on
each server. For Windows NT Clusters, one instance of the Secure Path Manager can be run for
both cluster servers. For centralized management, multiple instances of the Secure Path Manager
can be run on a single Client provided network access is available between the Client and all HA
servers.
For servers accessing controller host port 1 use LUN number and offset values in the range of 0 –
99, for controller host port 2 use number and offset values in the range 100 -199
Use the Unit Preferred Path parameter to assign units to a specific controller. Distribute units
equally across both controllers for proper load balancing
SSP - Storagesets (LUNs) must be enabled for access from both paths using the Unit Connection
Name parameter feature
Secure Path configurations require a minimum of two FC HBAs in a server. Each FC HBA must
be connected to a different FC switch, and for cable symmetry, should be on the same switch port
number, for example:
Server 1 FC HBA 1 to FC Switch 1 - Switch Port 1
Server 1 FC HBA 2 to FC Switch 2 - Switch Port 1
Server 2 FC HBA 1 to FC Switch 1 - Switch Port 2
Server 2 FC HBA 2 to FC Switch 2 - Switch Port 2
It is highly recommended that the cabling scheme shown in each Secure Path multiple-bus
configurations be followed as depicted.
For version 2.2, the Secure Path Manager uses the controller serial number to determine which
path (controller) will be displayed first in the GUI, thus the lower value serial number will be
displayed first in the display as the top path labeled "CONTROLLER A". The higher controller
serial number will be displayed as the bottom path and labeled as "CONTROLLER B".
AA–RHH6B–TE
Application Note
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