52 Sun StorageTek 2500 Series Array Hardware Installation Guide • September 2009
Single-Controller Configurations
This configuration has a single controller and a single back-end channel. By
definition, there is a single path connection to the data host, and no redundancy is
available. There can be drive expansion trays on the single back-end channel.
The cabling is the same as the cabling on a single channel of an ordinary array, such
as that shown on the A-side in
FIGURE 2-18. CRU removal and replacement
procedures in a single-controller configuration are the same as those for a dual-
controller configuration with a failed controller (with the exception of the service
procedures targeted at the failed controller). These procedures are available in
Service Advisor. Maintenance procedures such as firmware updates or servicing of
the controller tray or drive expansion trays will cause loss of access to the storage
array during the performing of the procedure, since there is no backup channel.
Performance and default behavior are the same as a dual-controller configuration
with a failed or missing controller. Write cache is by nature in write-through mode
because there is no cache mirroring possible.
Next Steps
Now You Are Ready To Connect The Management Host, As Described In Chapter 3.
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