06-14-2009
df and du command showing different results
I recently encountered this on the AIX system
df command showed usage is 100% i.e 1.5 GB while du command showed usage is only 500MB
Why are the 2 commands showing different output
This command shows usage is 1.5 GB
nlxdsm29:deqadm 24> df -k .
/usr/sap/DEQ (/dev/vgdeq_1/lv_sap ) : 1560576 total allocated Kb
0 free allocated Kb
1560576 used allocated Kb
100 % allocation used
while this command shows usage is just 500MB
nlxdsm29:deqadm 28> *du -sk |sort -nr|head -10
457613 data
24285 log
689 work
51 sec
Also a process was using space on this directory
/usr/sap/DEQ: 12349co(deqadm) 12374co(deqadm) 12358co(deqadm) 12348co(deqadm)
My senior told me that may be the process was writing to a file on this directory . The file must have been deleted for freeing up the space but as the file handle was open the space could not be freed up as reflected in df command
I could nt understand it .
So can anybody explain this different behaviour of commands
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LEARN ABOUT ULTRIX
accton
sa(8) System Manager's Manual sa(8)
Name
sa, accton - print process accounting statistics
Syntax
/etc/sa [ options ] [ file ]
/etc/accton [ file ]
Arguments
file With an argument naming an existing file, causes system accounting information for every process executed to be placed at the end
of the file. If no argument is given, accounting is turned off.
Description
The command reports on, cleans up, and generally maintains accounting files.
The is able to condense the information in into a summary file which contains a count of the number of times each command was called and
the time resources consumed. This condensation is desirable because on a large system can grow by 100 blocks per day. The summary file is
normally read before the accounting file, so the reports include all available information.
If a file name is given as the last argument, that file will be treated as the accounting file. The file is the default.
Output fields are labeled: "cpu" for the sum of user+system time (in cpu seconds), "re" for real time (also in cpu seconds), "k" for cpu-
time averaged core usage (in 1k units), "avio" for average number of I/O operations per execution. With options fields labeled "tio" for
total I/O operations, "k*sec" for cpu storage integral (kilo-core seconds), "u" and "s" for user and system cpu time alone (both in cpu
seconds) will sometimes appear.
Options
-a List all command names including those containing unprintable characters and those used only once. By default, places all command
names containing unprintable characters and those used only once under the name `***other.'
-b Sort output by sum of user and system time divided by number of calls. Default sort is by sum of user and system times.
-c Besides total user, system, and real time for each command, print percentage of total time over all commands.
-d Sort by average number of disk I/O operations.
-D Print and sort by total number of disk I/O operations.
-f Force no interactive threshold compression with option.
-i Do not read in summary file.
-j Instead of total minutes for each category, give seconds per call.
-k Sort by cpu-time average memory usage.
-K Print and sort by cpu-storage integral.
-l Separate system and user time; normally they are combined.
-m Print number of processes and number of CPU minutes for each user.
-n Sort by number of calls.
-r Reverse order of sort.
-s Merge accounting file into summary file when done.
-t For each command, report ratio of real time to the sum of user and system times. If the sum of user and system times is too small
to report, `*ignore*' appears in this field.
-u Superseding all other flags, print for each command in the accounting file the user ID and command name.
-v Followed by a number n, types the name of each command used n times or fewer. Await a reply from the terminal; if it begins with
`y', add the command to the category `**junk**.' This is used to strip out garbage.
Restrictions
Accounting is suspended when there is less than 2% free space on disk. Accounting resumes when free space rises above 4%.
Files
Raw accounting
Summary
Per-user summary
See Also
acct(2), ac(8)
sa(8)