Fibre Channel ServerNet Adapter Installation and Support Guide (G06.28+, H06.06+, J06.03+)

primaryportname,
backupportname
define the primary and backup port WWNs on the ESS for
the paths.
primarylun
define the primary disk volumes in the ESS for the paths.
Figure 1-5 shows the paths from the processors to the ESS. As described in Disk Configuration
(ESS Connection) on page 2-14, you add the paths to the configuration database. The step of
adding the paths to the configuration database defines the paths from the processors, through
the FCSA, to the disks in the ESS.
NOTE: There can be many LUNs on each ESS port, and a single SAC can communicate with
many ESS ports.
Figure 1-5 also shows the fault-tolerant design of the paths through the FCSA to the ESS:
• If a processor fails, the path from the backup processor takes over.
• If a FCSA fails, the backup FCSA takes over. (Each FCSA is connected to both the X and Y
ServerNet fabrics.)
• If the port on the ESS fails, the backup port takes over.
• If the ESS LUN fails, its backup disk takes over.
In addition to the fault-tolerant configuration shown in Figure 1-5, you can create mirrored
configurations, further adding to the fault tolerance. For information about developing an overall
strategy for configuring the paths to the storage subsystem, see the NonStop S-Series Planning
and Configuration Guide. Your fault-tolerant design affects these procedures in this manual:
• Install the FCSA on page 2-10
• Disk Configuration (ESS Connection) on page 2-14
Your overall strategy might affect which slots you select for the FCSA installation and the paths
you configure between the processors and the disks. Your strategy might consist of general
principles, such as:
• Use mirroring
• Use four processors
• Use slots in different IOAM logical modules or different IOAM enclosures
• Use LUNs in different ESS systems.
These decisions affect the choices of the SCF attributes for the SCF ADD DISK command to the
storage subsystem. (See Disk Configuration (ESS Connection) on page 2-14.)
Relationship to the Fibre Channel Disk Module (FCDM)
For Integrity NonStop NS-series systems, the FCSA provides connectivity to the M8xxx Fibre
Channel disks located in a Fibre Channel disk module (FCDM).
Before the FCDM is connected to the FCSA, you must use the SCF ADD command to configure
a dummy DISK object. This configuration step makes the disks in the FCDM visible to OSM.
Figure 1-6 (page 26) shows an example of two paths from the processors through the FCSAs to
the storage subsystem.
Relationship to the Fibre Channel Disk Module (FCDM) 25