Fibre Channel ServerNet Adapter Installation and Support Guide (G06.27+, H06.03+)

Introduction to the FCSA
Fibre Channel ServerNet Adapter Installation and Support Guide—528254-011
1-15
Storage Subsystem SCF Attributes for ESS
Connections
primarycpu, backupcpu
define the primary and backup processor locations for the DISK process pair.
primarylocation, backuplocation
define the primary and backup locations (group, module, slot) of the FCSAs for the
paths.
primarysac, backupsac
define the primary and backup ports on the FCSA for the paths.
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 1-7 shows the paths from the processors to the ESS. As described in DISK
Configuration (ESS Connection) on page 2-15, 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.
Figure 1-7 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 1-7, 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 Modular I/O Installation and Configuration Guide. Your fault-tolerant design affects
the following procedures in this manual:
•
Install the FCSA on page 2-10
•
DISK Configuration (ESS Connection) on page 2-15
Your overall strategy may affect which slots you select for the FCSA installation and
the paths you configure between the processors and the disks. Your strategy may
consist of general principles, such as:
Note. There can be many LUNs on each ESS port and a single SAC can talk to many ESS
ports.