FS inode 58% Post: 302204633

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Operating Systems AIX FS inode 58% Post 302204633 by bakunin on Thursday 12th of June 2008 07:01:00 AM

06-12-2008

Registered User

The OS wont give you any alerts, regardless of how much filled a filesystem is. If you have some monitoring software, which does that for you (Patrol, HP/OpenView, CA-Unicenter, ....) then perhaps this software (more precisely: probably its agent) is at fault.

Every filesystem is a collection of disk space units - blocks, usually 512 bytes in size - which can be used by a file or be free. The ratio of used to unused blocks is what makes the filling percentage of the filesystem. "95%" means out of every 100 blocks 95 are used.

So far, so simple. But there is another side to it: whenever you create a file one special bookkeeping entry is being created - the inode. Inodes contain the information you see when you issue an "ls" - filename, modifikation date, size, etc.. Inodes are stored in a special part of the filesystem, which has to be set aside when the filesystem is being created.Your number of 58% says that of these inodes 58% are being used.

The ratio of inodes to available raw space is not fixed - when creating a filesystem there is an attribute "nbpi" - "number of bytes per inode". You can tune this number to fit your purposes: The default is good for the "usual mix" of files, but if you know that the filesystem will hold many small files you might wat to increase the number of inodes, otherwise you might run into the situation where you still have space left on the disk but have no inodes left to create files and use that space.

On the other hand, if you know that the FS will contain very few very large files (best example: databases) you can decrease the number of inodes to make more diskspace available for storage purposes.

bakunin

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matchpathcon_checkmatches(3)				     SELinux API documentation				      matchpathcon_checkmatches(3)

NAME

       matchpathcon_checkmatches,  matchpathcon_filespec_add, matchpathcon_filespec_destroy, matchpathcon_filespec_eval - check and report whether
       any specification index has no matches with any inode. Maintenance and statistics on inode associations

SYNOPSIS

       #include <selinux/selinux.h>

       void matchpathcon_checkmatches(char *str);

       int matchpathcon_filespec_add(ino_t ino, int specind, const char *file);

       void matchpathcon_filespec_destroy(void);

       void matchpathcon_filespec_eval(void);

DESCRIPTION

       matchpathcon_checkmatches() checks whether any specification has no matches and reports them.  The str argument is used as a prefix for any
       warning messages.

       matchpathcon_filespec_add() maintains an association between an inode ino and a specification index specind, and checks whether a conflict-
       ing specification is already associated with the same inode (e.g. due to multiple hard links). If so, then it uses the latter  of  the  two
       specifications based on their order in the file context configuration. Returns the specification index used or -1 on error.

       matchpathcon_filespec_destroy() destroys any inode associations that have been added, e.g. to restart for a new filesystem.

       matchpathcon_filespec_eval() displays statistics on the hash table usage for the inode associations.

RETURN VALUE

       Returns zero on success or -1 otherwise.

SEE ALSO

       selinux(8), matchpathcon(3), matchpathcon_index(3), freecon(3), setfilecon(3), setfscreatecon(3)

sds@tycho.nsa.gov						 21 November 2009				      matchpathcon_checkmatches(3)

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