Disk Free Space Not Adding Up

tad1214 · #1 July 12th, 2010, 21:32

Hello All

I know that if you delete a file that is currently being written to it doesnt actually put the space back into the available space.

Currently:

Code:

server1# df -h
Filesystem     Size    Used   Avail Capacity  Mounted on
/dev/da0s1a    496M    268M    188M    59%    /
devfs          1.0K    1.0K      0B   100%    /dev
/dev/da0s1e    496M    968K    455M     0%    /tmp
/dev/da0s1f     57G     50G    1.9G    96%    /usr
/dev/da0s1d    4.7G    2.3G    2.1G    52%    /var
linprocfs      4.0K    4.0K      0B   100%    /usr/compat/linux/proc

57 - 50 is not equal to 1.9G.

I share this server with a few other people and I am guessing someone deleted a massive log file while the service was still writing to it.

Is there any way to free this space up without rebooting my server?

Thanks!
-=Tom

fronclynne · #2 July 12th, 2010, 21:43

df -h only give you a rounded approximation
8% is reserved, & does not show in the Avail column

You're probably better off not screwing with reserved blocks and space/time optimisations on your /usr/. If you wanted to screw around with that stuff, get another drive (or add another partition, if you have unallocated space on your drive) and mount it as /data/ or something and see what tunefs(8) can do (newfs(8) too, for that matter).

Also: read this.

tad1214 · #3 July 13th, 2010, 00:46

Thanks for the help

Getting more drives in the 1U isnt really an option and getting bigger SCSI drives is expensive. I may have to invest in another server I suppose.

fronclynne · #4 July 13th, 2010, 01:28

Well, if you feel like poking around, /usr/ports/distfiles/ may have a bit of garbage, as with your (potentially defunct) working directories in ports (try # rm -r /usr/ports/*/*/work if you just don't care (or some find(1) goblox to check it out, if you must (portsclean -CDL, which is part of ports-mgmt/portupgrade also works quite well in this regard))). Look at /usr/obj/ as well (though it's normally only about 800M).

Anyway, du(1) and find(1) are your friends. Learn them; use them.

pbd · #5 July 13th, 2010, 10:33

You can use fstat to list biggest open files:

Code:

# echo -e "file size\tinode num\tmount\tcommand"; fstat | \
awk '{ print $8, "\t", $6, "\t", $5, "\t", $2 }' | sort -nr | head
file size       inode num       mount   command
1862270976       1860727         /var    mysqld
380840808        2802829         /var    lighttpd
108508595        2802767         /var    httpd

Then find to search for file with inode in that mount point. For example the first file in listing above:

Code:

find /var -inum 1860727

If find doens't find any file with this inode, then it's probably the one deleted, that you are looking for and you can see that mysql is using it, so you can restart mysql to free the space.

tad1214 · #6 July 13th, 2010, 15:56

Quote:

Originally Posted by pbd

You can use fstat to list biggest open files:

Code:

# echo -e "file size\tinode num\tmount\tcommand"; fstat | \
awk '{ print $8, "\t", $6, "\t", $5, "\t", $2 }' | sort -nr | head
file size       inode num       mount   command
1862270976       1860727         /var    mysqld
380840808        2802829         /var    lighttpd
108508595        2802767         /var    httpd

Then find to search for file with inode in that mount point. For example the first file in listing above:

Code:

find /var -inum 1860727

If find doens't find any file with this inode, then it's probably the one deleted, that you are looking for and you can see that mysql is using it, so you can restart mysql to free the space.

fstat was the command someone told me about before and I couldn't remember thanks!!!

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The Following User Says Thank You to fronclynne For This Useful Post:
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