iTP Secure WebServer System Administrator's Guide (Version 7.0)

Installing the iTP Secure WebServer
iTP Secure WebServer System Administrator’s Guide—523346-012
2-5
Preparing Your System for the iTP Secure
WebServer
created. In addition, dynamic servers can drop one or two connections when the
Deletedelay effect occurs. Because all the httpd servers are designed to run on
high PIN, creating more servers at the startup should not create a resource
problem.
•
Specify a Larger Tandem_Receive_Depth
The range is 1 to 255. The default is 50. Selecting a larger number prevents extra
pathsends and possible socket migration. When the connection request is sent to a
server that is not running on the same processor as the original listening agent, a
socket migration occurs and a performance penalty is incurred. A larger number
also prevents the creation of dynamic servers. Creating an additional httpd server
on a processor that already has a number of httpd servers running is neither going
to help distribute the load nor improve performance. Note that load distribution has
now been moved down to the adapter level by use of the round-robin filter.
Additional processes can create more dispatching costs for the processor.
•
Specify the -address Command in All Accept Directives
You should use the -address command in all Accept directives. Unlike the
conventional TCP/IP processes TCPSAM allows the httpd servers to interface with
all subnets configured in the Parallel Library TCP/IP environment. The “accept ALL
IP addresses” is literally ALL IP addresses defined in the entire system. This might
be more than you expected.
•
Rebalancing Servers Across processors
When a processor is brought down, PATHMON is likely to restart a number of static
servers on other processors in order to keep the number of static servers as
specified in the NUMSTATIC server attribute. When the processor is reloaded,
PATHMON will not automatically rebalance its servers among the processors. If
there are extensive reloads you might want to rebalance manually - using actions
ranging from a simple stopping of one or two servers, to a complete restart of the
iTPWebServer. Again, this behavior is not new to the PATHWAY system, it just
might be more obvious when everything from application to transport is vertically
aligned.
•
You Can No Longer Use Restarth
Because the new product architecture no longer has a distributor working as a
buffer zone between the incoming connection requests and the httpd servers, new
servers cannot successfully bind to a local port unless the older httpd servers
cease their operations. Therefore the -restarth option is no longer supported if you
are using Parallel Library TCP/IP.
4. If you do not have Domain Name Server (DNS) running on your network, configure
and run DNS. You start DNS when you start TCP/IP. The out-of-box start-up
requires that the host name be fully qualified to match the DNS entry. You should
the host ID using the IP address defined for host name.