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Table Of Contents
5 Restart the Windows Server computer.
Increasing the Size of the TCB Hash Table
The transmission control block (TCB) holds information about TCP connections that are made between View
Connection Server clients and their desktop sources. To support a large View desktop deployment on Windows
Server 2003 computers, you can increase the size of the TCB hash table.
On Windows Server 2008 computers, you do not need to increase the maximum size of the TCB hash table.
Windows Server 2008 fully tunes this value by default.
The TCB is a memory-resident data structure that contains socket numbers, the location of incoming and
outgoing data buffers, bytes received or unacknowledged, and other information.
To retrieve this information quickly, Windows Server stores TCB data structures in a hash table.
By default, Windows Server 2003 configures the number of hash table rows based on the number of CPUs in
the Windows Server computer.
Table 5-11. Maximum TCB Hash Table Size on Windows Server 2003
Number of CPUs Maximum Number of TCB Hash Table Rows
1 128
2 512
4 2,048
8 8,192
You use two different formulas to calculate the TCB hash table size on View Connection Server instances and
security servers.
Calculate the Size of the TCB Hash Table for View Connection Server
To support a large number of View desktops, you can optimize the size of the TCB hash table on each View
Connection Server instance. Calculate the size in rows.
Procedure
u
Use the following formula.
Number of hash table rows on each View Connection Server instance = ( (5 x clients) / servers )
+ desktops + 20
Where
clients
Projected number of concurrent client connections
servers
Number of View Connection Server instances in the replicated group
desktops
Number of View desktop sources in your deployment
Example: Calculating the Size of the TCB Hash Table on Each View Connection Server
For example, you might have 3,000 concurrent client connections, three View Connection Server instances, and
6,000 View desktop sources in your deployment.
For each View Connection Server instance, the result is 11,020, as shown in Table 5-12.
Chapter 5 Installing View Connection Server
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