Network related issues Post: 303002968

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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

09-06-2017

Moderator

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

rbatte1

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LEARN ABOUT CENTOS

slist

SLIST(1)							       slist								  SLIST(1)

NAME

       slist - Lists available NetWare Servers

SYNOPSIS

       slist [ pattern ]

DESCRIPTION

       slist lists all NetWare Servers available in your network.

       If slist does not print to a tty, the decorative header line is not printed, so that you can count the servers on your network by doing

       slist | wc -l

OPTIONS

       pattern
	  pattern is used to list only servers whose names match the specified pattern. For a server to be listed, the pattern must match the full
	  server name. You can use wildcards for the pattern, but you must protect these wildcards from any command  line  expansion  by  quoting.
	  Case doesn't matter.

EXAMPLE

       slist "I*"

       or

       slist "i*"
	      List all available Netware servers on your Network, that begin with an "I".

SEE ALSO

       ncpmount(8), ncpumount(8), pqlist(1), nprint(1)

CREDITS

       slist was written by Volker Lendecke (lendecke@math.uni-goettingen.de)

BUGS

       slist works only in IPX environment, as it uses SAP to find first server and then Bindery to get list of servers.

slist								    01/07/1996								  SLIST(1)