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Full Discussion: Network related issues
Homework and Emergencies Emergency UNIX and Linux Support Network related issues Post 303002940 by jim mcnamara on Tuesday 5th of September 2017 11:41:21 AM
Old 09-05-2017
What OS? Your other post mentions AIX. Getting data from the past is really difficult unless you had already set up monitoring or auditing.

If you have detailed logs from applications, sometimes you can infer that application A has been taking longer and longer times to complete.

Many kinds of problems are sporadic or are hard to reproduce. These can only be found by creating monitors before the fact.

Please give us more system details: specific OS, main application(s) for the system.
Example: AIX 7.3, sybase server on SAN.
 

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yppush(8)						      System Manager's Manual							 yppush(8)

NAME
yppush - force propagation of a changed Network Information Service (NIS) map SYNOPSIS
yppush [-d domain] [-v] mapname OPTIONS
Specify a domain. Verbose. This causes messages to be printed when each server is called, and for each response. Without this option, only error messages are printed. DESCRIPTION
The yppush command copies a new version of a Network Information Service (NIS) map from the master NIS server to the slave NIS servers. It is normally run only on the master NIS server by the make utility accessing the /var/yp/Makefile after the master NIS databases have been changed. When invoked, yppush first constructs a list of NIS server hosts by reading the NIS map ypservers within the domain. Keys within the map ypservers are the ASCII names of the machines on which the NIS servers run. A transfer map request is sent to the NIS server at each host, along with the information needed by the transfer agent (the program which actually moves the map) to call back the yppush command. When the attempt has completed (successfully or not), and the transfer agent has sent yppush a status message, the results can be printed to stdout. Messages are also printed when a transfer is not possible, for instance when the request message is undeliverable, or when the timeout period on responses has expired. Refer to ypfiles(4) and ypserv(8) for an overview of NIS. RESTRICTIONS
In the current implementation (version 2 NIS protocol), the transfer agent is ypxfr, which is started by the ypserv program. If yppush detects that it is speaking to a version 1 NIS protocol server, it uses the older protocol, sending a version 1 YPPROC_GET request and issues a message to that effect. Unfortunately, there is no way of knowing if or when the map transfer was performed for version 1 servers. The yppush command prints a message saying that an old-style message has been sent. The system administrator should later check to see that the transfer has actually taken place. ERRORS
Map xxx no such map in server's domain -- using ypservers Explanation: This is an informational message that indicates that the yppush command will push the maps to all servers listed in the ypservers map. FILES
SEE ALSO
Commands: ypserv(8), ypxfr(8) Files: ypfiles(4) yppush(8)
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