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 FREEBSD

intro

INTRO(8)						    BSD System Manager's Manual 						  INTRO(8)

NAME

     intro -- introduction to system maintenance procedures and commands

DESCRIPTION

     This section contains information related to system operation and maintenance.

     It describes commands used to create new file systems (newfs(8)), verify the integrity of the file systems (fsck(8)), control disk usage
     (edquota(8)), maintain system backups (dump(8)), and recover files when disks die an untimely death (restore(8)).	Network related services
     like inetd(8) and ftpd(8) are also described.

     All commands set an exit status.  Its value may be tested to see if the command completed normally.  Unless otherwise noted (rare), the value
     0 signifies successful completion of the command, while a value >0 indicates an error.  Some commands attempt to describe the nature of the
     failure by using error codes defined in sysexits(3), or set the status to arbitrary values >0 (typically 1), but many such values are not
     described in the manual.

     A number of pages in this section describe general system management topics.

     For example, the boot(8) manual page describes the system bootstrapping procedures, and the diskless(8) manual page describes how to boot a
     system over a network.  The crash(8) manual page should be consulted to understand how to interpret system crash dumps.

HISTORY

     The intro section manual page appeared in 4.2BSD.

BSD
								 October 22, 2006							       BSD