DCE Installation, Configuration, and Management Guide
HP NonStop DCE Installation, Configuration, and Management Guide—429552-005
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5
Recommended Cell Configuration
This section provides recommendations for configuring a DCE cell on a NonStop node.
The current maximum configuration values appear in Table 5-1 on page 5-2.
Recommendations for Configuring a Cell
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Allocate at least two processors to each virtual host.
•
Configure each virtual host so that it uses processors not used by other virtual
hosts.
•
Run at least two virtual hosts in each cell.
•
Duplicate all mission-critical application servers in both virtual hosts.
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A typical virtual host should consist of at least a security server, a cell directory
service (CDS) server, and three distributed time service (DTS) servers. This
configuration is also the recommended minimum configuration for a cell.
•
Management of multiple-cell configurations is more difficult, so you should start
with one cell and move to a multiple-cell configuration only when you have a good
reason to do so.
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The CDS server should be run on the HP NonStop operating system. The NonStop
DCE CDS server is implemented using NonStop SQL/MP for higher availability and
greater performance. Database changes are protected under TMF transactions to
maintain consistency.
For each CDS server, data is stored in a single set of SQL tables regardless of how
many clearinghouses are created. In NonStop DCE, there is no advantage to
creating multiple clearinghouses within a single server, and there are some
disadvantages related to replication. Therefore, you should create only one
clearinghouse for each NonStop DCE server.
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You might also want to run the security server on the NonStop operating system.
Advantages include:
°
Mirrored disks can be used for the security registry.
°
NonStop servers are hardware fault tolerant.
•
Decide which protocol sequences (ncacn_ip_tcp or ncadg_ip_udp) to use and
how to use them. For information on these protocol sequences, see UDP versus
TCP protocol sequences in the section on application design considerations in the
DCE Application Programming Guide.