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I have an Ubuntu server.my Mysql service stopped and it did not start. I found out that my free disk space is very low.

Filesystem            Size  Used Avail Use% Mounted on
/dev/cciss/c0d0p1      32G   31G     0 100% /
none                  497M  312K  497M   1% /dev
none                  501M     0  501M   0% /dev/shm
none                  501M  252K  501M   1% /var/run
none                  501M     0  501M   0% /var/lock
none                  501M     0  501M   0% /lib/init/rw

I saw

/dev/cciss/c0d0p1

It fills all of my servers disk space. I try

umount /dev/cciss/c0d0p1

but device was busy. I looked for process that use c0d0p1 here is result of

fuser -m /dev/cciss/c0d0p1

/dev/cciss/c0d0p1: 1rce 2rc 3rc 4rc 5rc 6rc 7rc 8rc 9rc 10rc 11rc 12rc 13rc 14rc 16rc
17rc 18rc 19rc 20rc 21rc 22rc 23rc 24rc 25rc
26rc 27rc 28rc 29rc 30rc 31rc 34rc 35rc 36rc
37rc 38rc 39rc 40rc 41rc 45rc 46rc 49rc 50rc
51rc 52rc 53rc 54rc 55rc 56rc 57rc 189rc 192rc
193rc 215rc 216rc 217rc 260rce 262rce 326rce 332rce
376rc 402rc 481rce 530rce 548rce 588rc 589rc 590rc
591rc 592rc 593rc 594rc 595rc 596rc 597rc 598rc 599rc 600rc 601rc 602rc 603rc 604rc 605rc 610re 614re 618re 619re 622re 623rce 629rce 630rce 656rce 673rce 677re
682re 697re 713rce 727rce 728rce 729rce 730rce 731rce
746re 775rce 776e 777e 778e 779e 780e 781e 782rc
784rce 786rce 853rce 868rce

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closed as not a real question by Sven, Khaled, pauska, gWaldo, Chopper3 Jun 23 '12 at 14:23

It's difficult to tell what is being asked here. This question is ambiguous, vague, incomplete, overly broad, or rhetorical and cannot be reasonably answered in its current form. For help clarifying this question so that it can be reopened, visit the help center.If this question can be reworded to fit the rules in the help center, please edit the question.

    
Like I said in the question you posted four hours ago: You should consider accepting some answers to your questions before asking any more. –  pauska Jun 23 '12 at 11:14
3  
You don't need a Q&A site you need some basic education on the tools you have. As it is your level of understanding is way below that which we would need to help you. –  Iain Jun 23 '12 at 11:25
    
This is actually a well-asked question. It clearly explains what the problem is and what he's already tried, no matter how wrong it may be. –  Ladadadada Jun 23 '12 at 15:21

3 Answers 3

You are trying to unmount your root partition, this is not a good idea. Instead you should free up space on that disk. You can start by looking for obsolete files in your /var/log folder and the home folders for all your users. Also do not forget to clean out /tmp.

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If your earlier question is any clue, /var/spool/mail might be a good place to look. –  Ladadadada Jun 23 '12 at 15:05

It tells you that the root file system / is used by every process and that you can't unmount it in a running system. Why would you anyway? You have to delete files on the disk, but it's not necessary to unmount it for this purpose.

In other words, /dev/cciss/c0d0p1 is your servers' only disk space and is not what filled it - if you unmount it, you have no space at all, neither full nor empty.

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Clear up some disk space and try installing ncdu utility. It's available from repositories on some systems. If not, compile it manually. Just run this utility and in some period of time (maybe 20 min for your 30G disk) you will get aware of all directories sorted by their disk usage. Thus, you will be able to find out where the problem is. Sometimes results are very surprising, as you may find some outdated backups, etc. I'd recommend to start it in screen.

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