01-23-2013
Not because of file system getting full but file system ro situation could occue becaused of high I\O rate, bad hardware, incorrectcly configured storage etc..
File sysetm is generally turns read-only to save it self from potential damages.
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DCHECK(8) System Manager's Manual DCHECK(8)
NAME
dcheck - file system directory consistency check
SYNOPSIS
dcheck [ -i numbers ] [ filesystem ]
DESCRIPTION
Dcheck reads the directories in a file system and compares the link-count in each i-node with the number of directory entries by which it
is referenced. If the file system is not specified, a set of default file systems is checked.
The -i flag is followed by a list of i-numbers; when one of those i-numbers turns up in a directory, the number, the i-number of the direc-
tory, and the name of the entry are reported.
The program is fastest if the raw version of the special file is used, since the i-list is read in large chunks.
SEE ALSO
filsys(5), clri(8), fsck(8), icheck(8), ncheck(8)
DIAGNOSTICS
When a file turns up for which the link-count and the number of directory entries disagree, the relevant facts are reported. Allocated
files which have 0 link-count and no entries are also listed. The only dangerous situation occurs when there are more entries than links;
if entries are removed, so the link-count drops to 0, the remaining entries point to thin air. They should be removed. When there are
more links than entries, or there is an allocated file with neither links nor entries, some disk space may be lost but the situation will
not degenerate.
BUGS
Since dcheck is inherently two-pass in nature, extraneous diagnostics may be produced if applied to active file systems. Default file sys-
tems vary with installation so dcheck should use fstab(5).
3rd Berkeley Distribution DCHECK(8)