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Old 07-08-2002, 08:35 PM   #1
Registered: Feb 2002
Posts: 586

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df -h .. Lying?


Below is given the partition of my hard drive. I have probably very stupid question. For example /dev/hda3 is 13 GIG ( 10 GIG [available] + 2.2 GIG[used] = 12.2 GIG) where is another 0.8 GIG of hard drive? Same story with /dev/hda2. What is wrong?

root@localhost /]# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/hda3 13G 2.2G 10G 17% /
/dev/hda2 50M 14M 34M 28% /boot
none 125M 0 124M 0% /dev/shm
Old 07-08-2002, 08:42 PM   #2
Registered: Jun 2002
Location: Bailey, CO
Distribution: Slackware
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My geuss is its just rounding. I seen fs listed at 100% that still had space on the. try df -k and df -m?
Then again I'm not sure how ext2 journaling effects file space?
Old 07-08-2002, 08:52 PM   #3
LQ Guru
Registered: Aug 2001
Location: Dublin, Ireland
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First, like pickledbeans said, there is quite a lot lost to inode space for the filesystem.

Second, hard drive manufacturers are cheap and give your bytes to you in linear space, so 13Gb is:

13,000,000,000 bytes.

Meanwhile every operating system on the planet treats 1k as

1024 bytes. (2 to the tenth) So 1 Meg:

1024x1024 = 1048576 bytes. (2 to the twenthieth) So 1 Gig:

1048576x1024 = 1073741824 bytes.

13000000000 / 1073741824 = 12.11Gb so really the drive probably has more linear bytes on it than it claims (hard to make the platters so bloody precise)




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