02-13-2007
Inconsistent memory usage display
When i was trying to store a file of size 743 MB into a directory i got a msg. that the disk is full. But when i used the df -k . command on that directory it showed only 40% in usage and the disk had more than enough memory for the file. When i checked the syslog i found that at that instant of time when the file was trying to be created inside the directory the corresponding volume was full. That is why it showed the error. But then how the command showed 40% free. Any explanations?
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LEARN ABOUT BSD
quotacheck
QUOTACHECK(8) System Manager's Manual QUOTACHECK(8)
NAME
quotacheck - filesystem quota consistency checker
SYNOPSIS
quotacheck [ -v ] filesystem ...
quotacheck [ -v ] -a
DESCRIPTION
Quotacheck examines each filesystem, builds a table of current disk usage, and compares this table against that recorded in the disk quota
file for the filesystem. If any inconsistencies are detected, both the quota file and the current system copy of the incorrect quotas are
updated (the latter only occurs if an active filesystem is checked).
Available options:
-a If the -a flag is supplied in place of any filesystem names, quotacheck will check all the filesystems indicated in
/etc/fstab to be read-write with disk quotas.
-v quotacheck reports discrepancies between the calculated and recorded disk quotas.
Parallel passes are run on the filesystems required, using the pass numbers in /etc/fstab in an identical fashion to fsck(8).
Normally quotacheck operates silently.
Quotacheck expects each filesystem to be checked to have a quota files named quotas located at the root of the associated file system.
These defaults may be overridden in /etc/fstab. If a file is not present, quotacheck will create it.
Quotacheck is normally run at boot time from the /etc/rc.local file, see rc(8), before enabling disk quotas with quotaon(8).
Quotacheck accesses the raw device in calculating the actual disk usage for each user. Thus, the filesystems checked should be quiescent
while quotacheck is running.
FILES
quotas at the filesystem root
/etc/fstab default filesystems
BUGS
The quotas file may be named arbitrarily but must reside in the filesystem for which it contains quota information. Quotacheck will give
the error:
%s dev (0x%x) mismatch %s (0x%x)
if the quotas file is not in the filesystem being checked. This restriction is enforced by the kernel but may be lifted in the future.
SEE ALSO
quota(1), quotactl(2), fstab(5), edquota(8), fsck(8), quotaon(8), repquota(8)
HISTORY
The quotacheck command appeared in 4.2BSD.
4.2 Berkeley Distribution January 24, 1996 QUOTACHECK(8)