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I run a little script that prints the available space for file system:
Code:
#!/usr/bin/perl5
sub CheckDiskSpace
{
use Filesys::DiskFree;
my $handle = new Filesys::DiskFree;
$handle->df();
$loc1 = '/dev';
$loc2 = '/var/run';
$loc3 = '/boot';
print "... $loc1, $loc2, $loc3, '/' \n";
foreach my $file ($loc1,$loc2,$loc3,'/' )
{
my $bytesavailable=$handle->avail($file);
print "at $file, available bits = $bytesavailable \n";
}
}
CheckDiskSpace();
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The result is:
... /dev,/var/run,/boot,'/'
at /dev, available bits = 1028820992
at /var/run, available bits = 1028730880
at /boot, available bits =
at /, available bits =
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I then type command "df -a" and get:
Code:
Filesystem 1K-blocks Used Available Use% Mounted on
proc 0 0 0 - /proc
/sys 0 0 0 - /sys
varrun 1004736 116 1004620 1% /var/run
varlock 1004736 0 1004736 0% /var/lock
udev 1004736 28 1004708 1% /dev
devshm 1004736 12 1004724 1% /dev/shm
devpts 0 0 0 - /dev/pts
tmpfs 1004736 12 1004724 1% /dev/shm
securityfs 0 0 0 - /sys/kernel/security
gvfs-fuse-daemon 620395268 10647256 609748012 2% /root/.gvfs
/dev/sda1 497829 139305 332822 30% /media/_boot
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I then run "gparted" and get the picture as attached. It shows /dev/sda3 is mounted to '/'.
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The thing I do not understand is:
Why cannot perl script tell the available size of "/"?
Why doesnot df command show "/" as a mount point while gparted correctly shows that?
I tried to mount /dev/sda3 to '/' but it says it already exists.
My system is ubuntu server.
Can someone help me? Thanks.
