Re: strange DF (disk full) output
Bauke Jan Douma wrote: James Youngman wrote: There are many things that will normally result in the output of df being different to the output of du. Here are some examples: ... This explanation (well done!) should make it into the FAQ, if only for its clarity, that's what I think. I think so too. I just added this: http://www.gnu.org/software/coreutils/faq/#df-and-du-report-different-information Bob ___ Bug-coreutils mailing list Bug-coreutils@gnu.org http://lists.gnu.org/mailman/listinfo/bug-coreutils
Re: strange DF (disk full) output
On 9/19/07, Roberto Spadim [EMAIL PROTECTED] wrote: hello guys, i'm using archlinux current under XFS see what's happen with my /dev/sda2 (/ root partition) DF output: (88% Usage) [EMAIL PROTECTED] /]# df Sist. Arq. 1K-blocos Usad Dispon. Uso% Montado em /dev/sda2 9765312 8567884 1197428 88% / So, 1197428 KB is free. $ bc bc 1.06 Copyright 1991-1994, 1997, 1998, 2000 Free Software Foundation, Inc. This is free software with ABSOLUTELY NO WARRANTY. For details type `warranty'. scale=6 k=1197428 k/(1024*1024) 1.141956 k/100 1.197428 So you have about 1.2GB (1.14GiB) free. About 8.6GB has been used. [EMAIL PROTECTED] /]# du -s -x / 2031605 / A different figure. 2GB; a significant disparity. i think that DF is understanding /mnt/smb (smbfs mount point) as / disk usage but if i umount it and get again df and du -s /*, df still with 88% OK, so you had a hypothesis, tested it and found it was wrong. But that's a good way to proceed. what could i do? i think that DU is right, but DF is the main problem They are both right but they do different things. df asks the filesystem how much space is free. du examines all the files you told it to look at and adds up the space occupied by them. These figures are always different. I'll comment on this again, below. since, if i do: dd if=/dev/zero of=/test bs=1024 count=very big count i get: [EMAIL PROTECTED] /]# dd if=/dev/zero of=/test bs=1024 count=50 rm /testdd: escrevendo `/test': Não há espaço disponível no dispositivo 1194693+0 records in 1194692+0 records out 1223364608 bytes (1,2 GB) copied, 37,6201 s, 32,5 MB/s So you tried to create a really large file, and created one that was only 1.2GB because you ran out of space. This confirms that the output from df is correct. so, df is my problem since i have only 1.2 gb, Well, dd is telling you the same thing as df. I'd assume that df is correct, then. There are many things that will normally result in the output of df being different to the output of du. Here are some examples: * filesystem overhead (e.g. partly-ful blocks) * journal files * unlinked files which are still open (they are not actually deleted until they are closed, but du cannot see them because they have no name) * inaccessible files You can eliminate unlinked files as a problem by stopping (and if needed, restartring) all the processes on your system which have large open files. To get a list of all the deleted files which are still open and the processes which have them open, you can use this command (which probably works only on GNU/Linux systems): find /proc -mindepth 3 -path '/proc/*/fd/*' -type l -lname '*deleted*' -printf '%l %p\n' That's a lower case L after the % sign there. The output of this command is a list of deleted files (the left hand column) and the processes that have them open (for each /proc/NNN/fd/XX item in the right hand column, the NNN is the PID of the process which has the file open). As for inaccessible files, one way for that to happen is if you create a whole bunch fo stuff (say under /home) and then add a new filesystem and mount it over the existing stuff. The existing stuff is still there (you didn't delete it) but it is not accessible to du because a filesystem got mounted over it. Hope this helps, James. ___ Bug-coreutils mailing list Bug-coreutils@gnu.org http://lists.gnu.org/mailman/listinfo/bug-coreutils
Re: strange DF (disk full) output
James Youngman wrote on 20-09-07 12:02: On 9/19/07, Roberto Spadim [EMAIL PROTECTED] wrote: hello guys, i'm using archlinux current under XFS see what's happen with my /dev/sda2 (/ root partition) DF output: (88% Usage) [EMAIL PROTECTED] /]# df Sist. Arq. 1K-blocos Usad Dispon. Uso% Montado em /dev/sda2 9765312 8567884 1197428 88% / So, 1197428 KB is free. $ bc bc 1.06 Copyright 1991-1994, 1997, 1998, 2000 Free Software Foundation, Inc. This is free software with ABSOLUTELY NO WARRANTY. For details type `warranty'. scale=6 k=1197428 k/(1024*1024) 1.141956 k/100 1.197428 So you have about 1.2GB (1.14GiB) free. About 8.6GB has been used. [EMAIL PROTECTED] /]# du -s -x / 2031605 / A different figure. 2GB; a significant disparity. i think that DF is understanding /mnt/smb (smbfs mount point) as / disk usage but if i umount it and get again df and du -s /*, df still with 88% OK, so you had a hypothesis, tested it and found it was wrong. But that's a good way to proceed. what could i do? i think that DU is right, but DF is the main problem They are both right but they do different things. df asks the filesystem how much space is free. du examines all the files you told it to look at and adds up the space occupied by them. These figures are always different. I'll comment on this again, below. since, if i do: dd if=/dev/zero of=/test bs=1024 count=very big count i get: [EMAIL PROTECTED] /]# dd if=/dev/zero of=/test bs=1024 count=50 rm /testdd: escrevendo `/test': Não há espaço disponível no dispositivo 1194693+0 records in 1194692+0 records out 1223364608 bytes (1,2 GB) copied, 37,6201 s, 32,5 MB/s So you tried to create a really large file, and created one that was only 1.2GB because you ran out of space. This confirms that the output from df is correct. so, df is my problem since i have only 1.2 gb, Well, dd is telling you the same thing as df. I'd assume that df is correct, then. There are many things that will normally result in the output of df being different to the output of du. Here are some examples: * filesystem overhead (e.g. partly-ful blocks) * journal files * unlinked files which are still open (they are not actually deleted until they are closed, but du cannot see them because they have no name) * inaccessible files You can eliminate unlinked files as a problem by stopping (and if needed, restartring) all the processes on your system which have large open files. To get a list of all the deleted files which are still open and the processes which have them open, you can use this command (which probably works only on GNU/Linux systems): find /proc -mindepth 3 -path '/proc/*/fd/*' -type l -lname '*deleted*' -printf '%l %p\n' That's a lower case L after the % sign there. The output of this command is a list of deleted files (the left hand column) and the processes that have them open (for each /proc/NNN/fd/XX item in the right hand column, the NNN is the PID of the process which has the file open). As for inaccessible files, one way for that to happen is if you create a whole bunch fo stuff (say under /home) and then add a new filesystem and mount it over the existing stuff. The existing stuff is still there (you didn't delete it) but it is not accessible to du because a filesystem got mounted over it. Hope this helps, James. This explanation (well done!) should make it into the FAQ, if only for its clarity, that's what I think. bjd ___ Bug-coreutils mailing list Bug-coreutils@gnu.org http://lists.gnu.org/mailman/listinfo/bug-coreutils
Re: strange DF (disk full) output
Roberto Spadim wrote: i think that DF is understanding /mnt/smb (smbfs mount point) as / disk usage but if i umount it and get again df and du -s /*, df still with 88% No, df asks the filesystem itself for the information with statfs(), so the only way it is wrong is if the fs is damaged. You might want to fsck it. what could i do? i think that DU is right, but DF is the main problem since, if i do: dd if=/dev/zero of=/test bs=1024 count=very big count i get: [EMAIL PROTECTED] /]# dd if=/dev/zero of=/test bs=1024 count=50 rm /testdd: escrevendo `/test': Não há espaço disponível no dispositivo 1194693+0 records in 1194692+0 records out 1223364608 bytes (1,2 GB) copied, 37,6201 s, 32,5 MB/s so, df is my problem since i have only 1.2 gb, df said you had 1.2 gb free, so it appears you have confirmed that it is correct. ___ Bug-coreutils mailing list Bug-coreutils@gnu.org http://lists.gnu.org/mailman/listinfo/bug-coreutils
