Running out of /usr space ...


 
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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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prealloc(1)						      General Commands Manual						       prealloc(1)

NAME
prealloc - preallocate disk storage SYNOPSIS
name size DESCRIPTION
preallocates at least size bytes of disk space for an ordinary file name, creating the file if name does not already exist. The space is allocated in an implementation-dependent fashion for fast sequential reads and writes of the file. fails and no disk space is allocated if name already exists and is not an ordinary file of zero length, if insufficient space is left on disk, or if size exceeds the maximum file size or the file size limit of the process (see ulimit(2)). The file is zero-filled. DIAGNOSTICS
returns one of the following values upon completion: 0 Successful completion. 1 name already exists and is not an ordinary file of zero length. 2 There is insufficient room on the disk. 3 size exceeds file size limits. EXAMPLES
The following example preallocates 50000 bytes for the file WARNINGS
Allocation of file space is highly dependent on current disk usage. A successful return does not indicate how fragmented the file actually might be if the disk is approaching its capacity. AUTHOR
was developed by HP. SEE ALSO
prealloc(2), ulimit(2). prealloc(1)