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Full Discussion: Inode usage
Top Forums UNIX for Dummies Questions & Answers Inode usage Post 302839569 by Don Cragun on Friday 2nd of August 2013 03:01:03 AM
Old 08-02-2013
Quote:
Originally Posted by Siva SQL
I have been advised by our Unix System administrator that "I-Noe Usage Warning threshold of 5%" set after witnessing an issue in the past when our production batch cycle slowed down to the i-node count on this server reaching 7%.

We have a warning in place so that we can try to take action before it reaches that point again.

Would appreciate and views on how come I-node usage of 7% can impact on the Server slowness?

Server is running on HP-UX 11.31 11i v3.
This is completely backwards! Depending on file system type, there could be issues if the i-node FREE percentage dropped to 7%, but there can't possibly be a performance problem caused by having too many i-nodes free. The warning they have chosen to give is complaining when things are in GREAT shape.

When you get to 100% used on a filesystem that doesn't automatically allocate more i-nodes when you run out, you can't create any more files. This is a HUGE problem, but they won't generate a warning in this case (100% used) they are only generating a warning when everything is great. Tell them in no uncertain terms that if they want to issue a warning when there are less than 10% free i-nodes that would be great; but the way to test for that is to look for %iused values of 90% or higher; not 5% or lower!

As has already been noted here; for some filesystems (ones that allocate i-nodes when needed), this test is completely bogus. Issuing warnings when %used values are greater than 90% always makes sense; issuing warnings for %iuse values greater than 90% makes sense on some filesystem types. Issuing warnings when either of these values is less than 5% shows a complete lack of understanding what those values mean!
 

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Perl::Critic::Policy::TestingAndDebugging::ProhibitNoWarUsersContributed Perl DoPerl::Critic::Policy::TestingAndDebugging::ProhibitNoWarnings(3pm)

NAME
Perl::Critic::Policy::TestingAndDebugging::ProhibitNoWarnings - Prohibit various flavors of "no warnings". AFFILIATION
This Policy is part of the core Perl::Critic distribution. DESCRIPTION
There are good reasons for disabling certain kinds of warnings. But if you were wise enough to "use warnings" in the first place, then it doesn't make sense to disable them completely. By default, any "no warnings" statement will violate this policy. However, you can configure this Policy to allow certain types of warnings to be disabled (See "CONFIGURATION"). A bare "no warnings" statement will always raise a violation. CONFIGURATION
The permitted warning types can be configured via the "allow" option. The value is a list of whitespace-delimited warning types that you want to be able to disable. See perllexwarn for a list of possible warning types. An example of this customization: [TestingAndDebugging::ProhibitNoWarnings] allow = uninitialized once If a true value is specified for the "allow_with_category_restriction" option, then any "no warnings" that restricts the set of warnings that are turned off will pass. [TestingAndDebugging::ProhibitNoWarnings] allow_with_category_restriction = 1 SEE ALSO
Perl::Critic::Policy::TestingAndDebugging::RequireUseWarnings AUTHOR
Jeffrey Ryan Thalhammer <jeff@imaginative-software.com> COPYRIGHT
Copyright (c) 2005-2011 Imaginative Software Systems. All rights reserved. This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself. The full text of this license can be found in the LICENSE file included with this module perl v5.14.2 2012-06-07 Perl::Critic::Policy::TestingAndDebugging::ProhibitNoWarnings(3pm)
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