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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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Paranoid::Network::Socket(3pm)				User Contributed Perl Documentation			    Paranoid::Network::Socket(3pm)

NAME
Paranoid::Network::Socket - Socket wrapper for seemless IPv6 support VERSION
$Id: Socket.pm,v 0.3 2012/05/29 21:38:37 acorliss Exp $ SYNOPSIS
# use Socket; # no longer needed use Paranoid::Network::Socket; use Paranoid::Network::Socket qw(:crlf); $ipv6_enabled = has_ipv6(); DESCRIPTION
This module is a wrapper for Socket(3) and Socket6(3), and is meant to be used in lieu of using those packages directly. Doing so removes any of the version dependent support issues on Perl and its bundled Socket(3) where IPv6 is concerned. Starting in Perl 5.12 the beginnings of IPv6 support emerged in the bundled Socket(3) module, but full IPv6 support didn't arrive until 5.14. Prior versions of Perl required the use of the external Socket6(3) module (available on CPAN). With this module IPv6 support, if available, is brought in automatically at runtime, regardless of where that support is provided. It also makes a default export of inet_pton and inet_ntop, something that Socket(3) only does on request. Finally, this module provides a has_ipv6 function which will return whether your Perl has full IPv6 support. Full support is determined by the presence of sockaddr_in6. All of the regular tag sets provided by either Socket modules are supported by this module. SUBROUTINES
/METHODS has_ipv6 $ipv6_enabled = has_ipv6(); Returns a boolean value denoting whether or not this module has full IPv6 support. DEPENDENCIES
o Socket o Socket6 (optional) BUGS AND LIMITATIONS
AUTHOR
Arthur Corliss (corliss@digitalmages.com) LICENSE AND COPYRIGHT
This software is licensed under the same terms as Perl, itself. Please see http://dev.perl.org/licenses/ for more information. (c) 2005, Arthur Corliss (corliss@digitalmages.com) perl v5.14.2 2012-05-29 Paranoid::Network::Socket(3pm)
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