Compaq Infortrend Manuale Utente
Infortrend
8-2
8.2
Major Concerns
Most of the configuration options in this chapter are directly related
to controller redundancy. Joining two controllers into a dual-active
pair can eliminate most possible points of failure. Configuring a
controller pair requires careful planning and proper setup and the
requirements can be summarized as follows:
to controller redundancy. Joining two controllers into a dual-active
pair can eliminate most possible points of failure. Configuring a
controller pair requires careful planning and proper setup and the
requirements can be summarized as follows:
!
Redundant Cache Coherency Channels (RCC):
1. RCC
FC channels can be manually assigned as
the dedicated communications loops, two
are recommended for path redundancy and
sufficient bandwidth.
the dedicated communications loops, two
are recommended for path redundancy and
sufficient bandwidth.
2. Drive + RCC
Communications traffic distributed over
drive loops
drive loops
!
Connection between Controllers:
Cabling between controllers, hardware link through a
common backplane, Fibre hub or switch (for SAN
applications and for those models that do not have by-
pass chips)
common backplane, Fibre hub or switch (for SAN
applications and for those models that do not have by-
pass chips)
!
Channel Mode Assignment
According to the topological plan, your I/O channels
can be designated as:
can be designated as:
•
Host
•
RCC paths
•
Drive
•
Drive + RCC
!
Host Channel Connection Type:
This depends on the way your RAID system is
connected to the host computer(s). The host
connection type can be:
connected to the host computer(s). The host
connection type can be:
•
FC-AL
•
Fabric (point-to-point)
!
Controller Unique ID:
This ID will be used to generate Fibre ports’ node
names, and is necessary for addressing the controller
during the controller failover/failback operation.
names, and is necessary for addressing the controller
during the controller failover/failback operation.
!
Dual-Loop:
1. Drive-side dual loop provides data path
redundancy. Firmware is capable of executing a
load-sharing algorithm to optimize dual-loop
load-sharing algorithm to optimize dual-loop