Avaya VTCPD Features (Software Release 2.1 on MPS 2.1) Manual do Utilizador descarregar pdf (Página 58)

VTCPD Features User Manual

Page 58 P0602483 Ver: 03.41

VTCPD Features User Manual

If the message is sent to the host, requests are either physically stored on the host side

or in the kernel buffer. If an application restarts before receiving the reply, this has no

effect on the host, which eventually retrieves and processes the request. However, this

could result in the processing of outdated requests which can further reduce already

limited host resources.

VTCPD can also hold requests locally and remove them from the queue when the

application restarts. This is done if the host is unable to process several messages

simultaneously. The VTCPD command line option is vtcpd -q #

This option specifies how many unanswered requests are sent to the host before

queuing them locally. If the option is not specified, all requests (default) are

immediately sent to the host. When -q option is specified, the VTCPD either sends

the request or stores it in a queue. When a reply comes from the host, the VTCPD

forwards the first message from the queue to the host. Another option used to maintain

one global queue for all links is vtcpd -Q #

In the global queue option, all requests go into the single queue and are retrieved when

the number of unanswered requests for any link becomes smaller than the number

specified by -Q option. In this mode, any request can be sent through any link, so the

-m I option is added to the list of command line arguments and the option -m R (if

any) is disabled.

In the global mode, any request can be sent through any link, so the -m I option is

added to the list of command line arguments. Correspondingly, the option -m R, (if

specified) is disabled.

If an application restarts and executes either the Free or Get operation, all related

requests are removed from the queues.

Clearing the Connection

When VTCPD queues requests, it does not send them to the host until the previous

request has been answered. However, requests can go unanswered due to a variety of

reasons (for example, incorrectly formatted requests, bugs in the code) The

unanswered request causes the corresponding connection to be unusable.

Queueing Requests

vtcpd [{-q <#> | -Q <#>}]

Args: -q <#> Specifies how many unanswered requests go to the host before

they are queued locally. Unless this option is specified, all requests

are immediately written to the host.

-Q <#> Specifies that all requests from all links are to be placed in a global

queue. When the number of unanswered requests for any link

becomes smaller than the specified value, the requests are

retrieved.

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Avaya VTCPD Features (Software Release 2.1 on MPS 2.1) Manual do Utilizador Página 58