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# 8  
Old 10-24-2014
Before you start juggling filesystems, perhaps verify that the data on that filesystem is where it belongs...

Check for dangling filehandles - compare the output of du -sk /usr and df -k /usr, if the du output is significantly lower, you've probably deleted a file but left a process using the handle. Use lsof (or fuser, /proc or pfiles) to locate the process that is holding the handle and restart it.

Look for the big blobs in /usr - du -sk /usr/* | sort -n will show you the largest directories in there, you can drill deeper from there as required.

Look for recently modified files - /usr should be fairly static, if something is changing frequently, maybe it doesn't belong in there. find /usr -mtime -10 will show files modified in the last 10 days.
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LEARN ABOUT OPENSOLARIS

df

df(1B)						     SunOS/BSD Compatibility Package Commands						    df(1B)

NAME

       df - display status of disk space on file systems

SYNOPSIS

       /usr/ucb/df [-a] [-i] [-t type] [filesystem...]
	    [filename...]

DESCRIPTION

       The  df	utility  displays the amount of disk space occupied by currently mounted file systems, the amount of used and available space, and
       how much of the file system's total capacity has been used.

       If arguments to df are path names, df produces a report on the file system containing the named file. Thus `df	.'  shows  the	amount	of
       space on the file system containing the current directory.

OPTIONS

       The following options are supported:

       -a	  Report on all filesystems including the uninteresting ones which have zero total blocks (that is, auto-mounter).

       -i	  Report the number of used and free inodes. Print ` * ' if no information is available.

       -t type	  Report on filesystems of a given type (for example, nfs or ufs).

EXAMPLES

       Example 1 Using df

       A sample of output for df looks like:

	 example% df
	 Filesystem   kbytes  used  avail  capacity  Mounted on
	 sparky:/	7445  4714  1986     70%     /
	 sparky:/usr   42277 35291  2758     93%     /usr

       Note  that  used+avail  is less than the amount of space in the file system (kbytes); this is because the system reserves a fraction of the
       space in the file system to allow its file system allocation routines to work well. The amount reserved is typically about 10%; this can be
       adjusted  using	tunefs	(see  tunefs(1M)).  When all the space on a file system except for this reserve is in use, only the super-user can
       allocate new files and data blocks to existing files. When a file system is overallocated in this way, df can report that the  file  system
       is more than 100% utilized.

FILES

       /etc/mnttab    List of file systems currently mounted

       /etc/vfstab    List of default parameters for each file system

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWscpu			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       du(1), quot(1M), tunefs(1M), mnttab(4), attributes(5)

SunOS 5.11							    14 Sep 1992 							    df(1B)