Df - Revision history

Jimbo at 07:56, 19 June 2007

2007-06-19T07:56:00Z

Dave: /* Incorrect df */

2007-06-19T03:25:25Z

Incorrect df

LionKimbro: Incorrect df due to held files

2007-06-17T21:22:59Z

Incorrect df due to held files

Jimbo at 15:23, 1 May 2007

2007-05-01T15:23:16Z

Jimbo at 12:40, 9 September 2004

2004-09-09T12:40:04Z

Jimbo at 12:39, 9 September 2004

2004-09-09T12:39:36Z

Light at 09:56, 7 September 2004

2004-09-07T09:56:42Z

Light at 09:55, 7 September 2004

2004-09-07T09:55:46Z

New page

[[df]] is acronymic for '''disc free'''

When this command is used with no parameters, it will display the amount of disc space free on each mounted device in a 512-byte per block count, as well as a percentage.

You may specify either a device path or plain directory path to retreive the associated mount-point information. Also, the parameter '''-h''' may be used to have the output displayed in 'human-readable' format.

[light@splat ~]$ '''/bin/df'''
Filesystem 1K-blocks Used Avail Capacity Mounted on
/dev/ad0s1a 128990 104110 14562 88% /
/dev/ad0s1f 257998 146 237214 0% /tmp
/dev/ad0s1g 18809884 15014076 2291018 87% /usr
/dev/ad0s1e 257998 236788 572 100% /var
procfs 4 4 0 100% /proc

[light@splat ~]$ '''df /tmp'''
Filesystem Size Used Avail Capacity Mounted on
/dev/ad0s1f 257998 146 237214 0% /tmp

[light@splat ~]$ '''df /dev/ad0s1f'''
Filesystem Size Used Avail Capacity Mounted on
/dev/ad0s1f 257998 146 237214 0% /tmp

[light@splat ~]$ '''df -h /'''
Filesystem Size Used Avail Capacity Mounted on
/dev/ad0s1a 132M 107M 15M 88% /

[[Category:System Commands]]

@@ Line 25: / Line 25: @@
   /dev/ad0s1a   132M   107M    15M    88%    /
-== Incorrect df ==
+== Deleting locked files ==
-Sometimes, df reports values that are blatantly wrong.
+Scenario:  MySQL is giving you error 28's, and you find /var is completely full.  You find that Apache's logs have grown over 200MB, so you delete them.  The 200MB this should free would put you well within limits...  but for some reason, df still reports that /var is completely full.  Why?
-Scenario:  MySQL is giving you error 28's, and you find /var is completely full.  You delete the 200 MB Apache logs, which should put you well within limits... ...for some reason, df still reports that /var appears is completely full?
+The problem is that even though you deleted the logfile, Apache still held a lock on it and thus the space cannot be reclaimed yet by the filesystem.  This is not an error on [df]'s part; the space really is still being taken up until the lock is released.  To fix it, you merely need to restart apache, (perhaps using [[Apachectl]]).  Apache then releases the log file, df shows the space returned as free, and MySQL goes back to working.
-−
-The problem is that Apache is still holding on to the log file, even though you deleted. Arguably this is not an error on [df]'s part; the space is still being taken up. In any case, to fix it:
-−
-If you restart apache, (perhaps using [[Apachectl]],) Apache releases the log file, and df shows the value right.  MySQL goes back to working.
 [[Category:System Commands]]

@@ Line 31: / Line 31: @@
 Scenario:  MySQL is giving you error 28's, and you find /var is completely full.  You delete the 200 MB Apache logs, which should put you well within limits... ...for some reason, df still reports that /var appears is completely full?
-The problem is that Apache is still holding on to the log file, even though you deleted.
+The problem is that Apache is still holding on to the log file, even though you deleted. Arguably this is not an error on [df]'s part; the space is still being taken up. In any case, to fix it:
 If you restart apache, (perhaps using [[Apachectl]],) Apache releases the log file, and df shows the value right.  MySQL goes back to working.
 [[Category:System Commands]]

← Older revision		Revision as of 12:40, 9 September 2004
Line 1:		Line 1:
−	[[df]] is acronymic for '''disk free'''	+	[[df]] is acronymic for '''disk free'''.

	When this command is used with no parameters, it will display the amount of disk space free on each mounted device in a 512-byte per block count, as well as a percentage.		When this command is used with no parameters, it will display the amount of disk space free on each mounted device in a 512-byte per block count, as well as a percentage.

@@ Line 1: / Line 1: @@
-[[df]] is acronymic for '''disc free'''
+[[df]] is acronymic for '''disk free'''
-When this command is used with no parameters, it will display the amount of disc space free on each mounted device in a 512-byte per block count, as well as a percentage.
+When this command is used with no parameters, it will display the amount of disk space free on each mounted device in a 512-byte per block count, as well as a percentage.
-You may specify either a device path or plain directory path to retreive the associated mount-point information. Also, the parameter '''-h''' may be used to have the output displayed in 'human-readable' format.
+You may specify either a device path or plain directory path to retrieve the associated mount-point information. Also, the parameter '''-h''' may be used to have the output displayed in 'human-readable' format.
   [light@splat ~]$ '''/bin/df'''

@@ Line 14: / Line 14: @@
   [light@splat ~]$ '''df /tmp'''
-  Filesystem    Size   Used  Avail Capacity  Mounted on
+  Filesystem  1K-blocks     Used   Avail Capacity  Mounted on
   /dev/ad0s1f    257998      146  237214     0%    /tmp
   [light@splat ~]$ '''df /dev/ad0s1f'''
-  Filesystem    Size   Used  Avail Capacity  Mounted on
+  Filesystem  1K-blocks     Used   Avail Capacity  Mounted on
   /dev/ad0s1f    257998      146  237214     0%    /tmp