Messages in this thread | | | From | Andreas Dilger <> | Date | Mon, 10 Jun 2002 11:55:59 -0600 | Subject | Re: /usr/bin/df reports false size on big NFS shares |
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On Jun 10, 2002 16:54 +0200, Samuel Maftoul wrote: > On several machines, with kernel 2.4.18 the same mounts reports different > sizes than with 2.4.4 : > > ------------------------------------------------------------------------- > maftoul@brick20:~ > uname -a > Linux brick20 2.4.4-4GB #6 Thu Jul 26 10:00:30 CEST 2001 i686 unknown > > maftoul@brick20:~ > df -h > Filesystem Size Used Avail Use% Mounted on > /dev/sda1 13G 3.1G 9.5G 25% / > shmfs 517M 0 516M 0% /dev/shm > grey:/disk91 230G 127G 102G 56% /mntdirect/_disk91 > yellow:/disk23 140G 100G 39G 72% /mntdirect/_disk23 > violet:/data/id19/external > 2.7T 1.1T 1.6T 38% /mntdirect/_data_id19_external > maftoul@brick20:~ > > ------------------------------------------------------------------------- > > maftoul@brick4:~ > uname -a > Linux brick4 2.4.18 #3 Thu Apr 4 17:04:20 CEST 2002 i686 unknown > maftoul@brick4:~ > > > maftoul@brick4:~ > df -h > Filesystem Size Used Avail Use% Mounted on > /dev/sda1 4.7G 2.7G 2.0G 58% / > shmfs 125M 0 124M 0% /dev/shm > grey:/disk91 230G 127G 102G 56% /mntdirect/_disk91 > yellow:/disk23 140G 100G 39G 72% /mntdirect/_disk23 > violet:/data/id19/external > 669G -7.0Z 1.6T 101% /mntdirect/_data_id19_external > ------------------------------------------------------------------------- > > See the violet one ? > The reported size is the same on every 2.4.18 machine using this mount I > saw.
Probably an overflow in the math somewhere. Since the overflow is in the zettabyte range, it is probably someone not being careful with 64-bit values overflowing. "64-bit values are large enough for everything, right..."
> It's all suse 7.2 , first one (2.4.4) is suse 7.2 base kernel, 2.4.18 is > our own (for firewire better firewire support).
Probably the best thing you can do is either diff the two kernel sources looking for changes in fs/nfs, or start with 2.4.4 and apply patches until you get a failure.
I don't think a lot of people will be able to help you test this, as they don't have 2.7TB NFS servers available ;-).
Cheers, Andreas
FYI: In case anyone is wondering (I was) a "Z" is a Zettabyte (2^70 bytes). It falls between Exabyte (1024 PB = 2^60) and Yottabyte (2^80). -- Andreas Dilger http://www-mddsp.enel.ucalgary.ca/People/adilger/ http://sourceforge.net/projects/ext2resize/
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