Sun Microsystems StorEdge T3+, Installation And Configuration Manual

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42 Sun StorEdge T3+ Array Installation and Configuration Manual • April 2002
Dual Hosts With Two Hubs and Eight Controller
Units
FIGURE 4-9
shows two application hosts connected through FC-AL cables to two hubs
and eight Sun StorEdge T3+ arrays. This configuration, also known as a multi-
initiator configuration, can be used for footprint and I/O throughput. The following
limitations should be evaluated when proceeding with this configuration:
■
Avoid the risk caused by any array or data path single point of failure using host-
based mirroring software such as VERITAS Volume Manager or Solaris Volume
Manager.
Note –
This configuration, running host-based mirroring features from VERITAS
Volume Manager or Solaris Logical Volume Manager, represents four arrays of data
mirrored to the other four arrays using host-based mirroring.
■
When configuring more than a single array to share a single FC-AL loop, as with
a hub, set the array target addresses to unique values.
This configuration is not a recommended for RAS functionality because the
controller is a single point of failure.
Note –
There are no hub port position dependencies when connecting arrays to a
hub. An array can be connected to any available port on the hub.
Each array needs to be assigned a unique target address using the
port set
command. These target addresses can be any number between 1 and 125. At the
factory, the array target addresses are set starting with target address 1 for the
bottom array and continuing to the top array. Use the
port list
command to
verify that all arrays have a unique target address. Refer to the Sun StorEdge T3+
Array Administrator’s Manual for further details.
The following two parameters must be set on the master controller unit, as follows:
■
Multi-path support software:
■
DMP:
sys mp_support rw
■
STMS:
sys mp_support mpxio
■
sys cache auto
■
sys mirror auto
Note –
For information on setting these parameters, refer to the Sun StorEdge T3+
Array Administrator’s Manual.