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Full Discussion: Network related issues
Homework and Emergencies Emergency UNIX and Linux Support Network related issues Post 303002968 by rbatte1 on Wednesday 6th of September 2017 05:33:29 AM
Old 09-06-2017
Some wild guesses:-
  • Loss of access to DNS server (slow reverse IP lookup for auditing, so slow login or application)
  • Database locks - hugely dependant on your application
  • Missing database index causing full table scans
  • Poor data queries, e.g. get all records from the database then check each in turn on criteria rather than building the condition into the query
  • Database logs files filling and flushing too slowly
  • Exhausting real memory causing paging (potentially DB consuming too much real memory)
  • Network speed conflict, e.g. if NIC is 10M-half and switch is 100M-full, it will work, but any file transfer will cripple it with lots of dropped packets.
  • IO issues, especially with NFS or an HA cluster if you fail over
  • Scheduled work, e.g. current stock summary
  • Ad-hoc jobs, e.g. current stock summary
  • Resources stealing by another LPAR if the definitions allow it
  • Large write volume to direct disk (e.g. local) rather than cached disk (RAID or SAN etc.)
  • High NFS contention especially with other seemingly unrelated servers

You can see it is a very very VERY wide spread of options so far - and the list is a long way from being exhaustive. You need to be a fair bit more explicit about what you have (including OS) what goes slow, what's happening at the time, what dependencies you have with other servers.



Robin
 

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ypinit(1M)																ypinit(1M)

NAME
ypinit - build and install Network Information Service databases SYNOPSIS
NIS_domain] NIS_server_name NIS_domain] Remarks The Network Information Service (NIS) was formerly known as Yellow Pages (YP). Although the name has changed, the functionality of the service remains the same. DESCRIPTION
is a shell script that creates Network Information Service (NIS) databases on either a master or slave NIS server. asks a few self- explanatory questions, and reports success or failure to the terminal. For an overview of Network Information Service, see ypfiles(4) and ypserv(1M). Options recognizes the following options and command-line arguments: Create the local host as the master server to all maps (databases) provided in the NIS domain (see domainname(1)). All maps are built from scratch, either from information pro- vided to at run-time, or from ASCII files in All such files should be complete and unabbreviated, unlike how they may exist on a NIS client machine (see passwd(4) for examples of abbreviated files). See ypmake(1M) for more information on how NIS databases are built on the master server. Note that uses the option when invoking so newly formed maps are not immediately copied to slave servers (see ypmake(1M)). Create NIS databases on a slave server by copying the databases from an existing NIS server that serves the NIS domain. The NIS_server_name argument should be the host name of either the master server for all the maps or a server on which the maps are current and stable. Configures the local host as a NIS client, so that the NIS client will attempt to bind to a particular NIS server. Invocation of with a option prompts the user to construct a list of NIS servers, in the order of preference, to which the client will try to bind. Each of these NIS servers must be listed in the file along with its IP Address. This list of NIS servers is stored in the file This file is used by when invoked without the option. (See ypbind(1M) in ypserv(1M)). If it is so desired that it is not necessary for a NIS client to bind to a NIS server in a particular list, the installation mechanism could be ignored. Causes to construct maps for the specified NIS_domain. defaults to the NIS domain shown by the command (see domain- name(1). RETURN VALUE
returns exit code 0 if no errors occur; otherwise, it returns exit code 1. AUTHOR
was developed by Sun Microsystems, Inc. FILES
SEE ALSO
domainname(1), makedbm(1M), ypmake(1M), yppush(1M), ypserv(1M), ypxfr(1M), ypxfrd(1M), group(4), hosts(4), netgroup(4), networks(4), passwd(4), protocols(4), publickey(4), rpc(4), services(4), ypfiles(4). ypinit(1M)
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