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Tornado 2.0 User’s Guide TARGET SERVERS PING While processing a wtxToolAttach( ) on a target server, the registry pings this target server. If the ping is unsuccessful (after 3 seconds of pending ping), the target server is considered to be not responding. While processing a wtxInfoQ(), the target servers that are not responding are pinged if the pingDelay has expired (see PING DELAY section). A not responding target server will be unregistered (and then considered to be dead) if it has been unsuccessfully pinged at least pingNumbers times AND if the time between the first and last unsuccessful ping time is at least equal to pingDelay*pingNnumbers. This is to avoid having a single failed ping lead to an unregistered target server. This mechanism is used to allow the Tornado tools to survive network latencies or short time failures. PING DELAY PING NUMBER CAVEAT OPTIONS This delay (in seconds) can be specified through the -pd option, and its default value is set to 120. It specifies after how many seconds a target server that does not respond should be pinged again. In combination with the -pn option (see PING NUMBER section), this value sets the time after which a target server that does not respond is considered dead. See the EXAMPLE section for examples on how to use the -pd option. This number, set by the -pn option, fixes the number of times a target server that does not respond has to be unsuccessfully pinged to be considered dead. See the EXAMPLE section for examples on how to use the -pn option. WARNING: If either the pingDelay or pingNumbers variable is set to 0, the installation will not forgive any network latencies, and a target server could be unregistered just because the network was slow for a short time. The vertical tab character is not supported in any of the registry fields and should never be used. -d | -directory Specify the directory containing the registry database file. -h | -help Display a help message summarizing target-registry usage and options. -pd pingDelay Set the delay between two pings on a dead target server. -pn pingNumbers Set the number of failed pings before considering a target server dead. 430
C Tornado Tools Reference -use_portmapper Use the local portmapper to register the target servers RPC services. This flag must be set if version 1.x Tornado tools or target servers have to connect using this registry. -V | -Verbose Turn on verbose mode. By default, the registry daemon is silent. Verbose mode displays information, warnings, and error messages. -v | -version Print the Tornado version. C EXAMPLES Display the Tornado registry on line help. wtxregd -h Start a Tornado registry in verbose mode. wtxregd -V Start a Tornado registry in verbose mode and save data base file in /tmp. wtxregd -V -d /tmp Start a Tornado registry using the local portmapper to register target servers. wtxregd -use_portmapper Start a Tornado registry with 30 seconds between two unsuccessful target server pings. wtxregd -V -pd 30 Start the Tornado registry with only two failed pings allowed. wtxregd -V -pn 2 Start the Tornado registry so that it unregisters target servers as soon as they seem to be unreachable. wtxregd -V -pn 0 wtxregd -V -pd 0 ENVIRONMENT VARIABLES WIND_BASE the root location of the Tornado tree. FILES SEE ALSO WINDBASE/.wind/wtxregd.hostName default location for the backup registry file (can be changed through the -d[irectory] option). tgtsvr, launch, browser, windsh, wtxreg (UNIX only), Tornado User’s Guide 431
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