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SubjectRe: ext3 issue..
I was thinking about delving into this problem a bit.   I don't have any 
unpartitioned free space on my physical drive. I was going to ask if
it's possible to create a virtual device in RAM or in a file that I
could then create an ext3 file system on for testing.. I'm at least
trying to recreate the situation of the negative diskspace usage.. then
maybe try to debug ext3 a bit. At first I thought "oh RAMFS!", then "no
wait, I couldn't create an EXT3 file system that way".. I need a
non-physical (block? or character?) device.

Thanks,
Davy



Davy Durham wrote:

> Greetings,
> I'm having an issues with ext3. For about 3 months the /home
> partition has had low-to-medium use/activity.. adding files, nightly
> log rotations, some mysql dbs coming and going at a slow pace.. Well,
> yesterday after I had migrated everything off of it (no files in /home
> anymore) the df output looked like this:
>
> # uptime
> 10:35:54 up 96 days, 14:22, 1 user, load average: 0.00, 0.00, 0.00
> # df -h
> Filesystem Size Used Avail Use% Mounted on
> /dev/ide/host0/bus0/target0/lun0/part1
> 2.0G 483M 1.4G 26% /
> /dev/ide/host0/bus0/target0/lun0/part6
> 33G -64Z 31G 101% /home
>
> I did notice that if I created a file (cat /dev/zero >/home/foo) of
> significant size that I could make it look normal again.. So I figure
> it's an underflow in some count.
>
> Crazy huh? Well, I unmounted /home and did an fsck -f on the
> partition and remounted it. Then everything looked okay.
>
> ---
>
> Well today on a different server (that I have not cleaned off yet)
> that has been up and running for 6 months is saying the same thing:
>
> # uptime
> 10:39:16 up 181 days, 2:42, 2 users, load average: 0.00, 0.00, 0.00
> # df -h
> Filesystem Size Used Avail Use% Mounted on
> /dev/ide/host0/bus0/target0/lun0/part1
> 2.0G 483M 1.4G 26% /
> /dev/ide/host0/bus0/target0/lun0/part6
> 33G -64Z 31G 101% /home
>
> Now, this server is still in production. I could bring it down for a
> brief time to fsck or reboot it, but I'd be afraid to. du -h /home
> shows that really only 268M is used.
>
> If I create a large file (176M) in /home it then don't underflow on
> the df, but is still incorrect.
>
>
> Is this a known issue with ext3? Or ext2? Anything I should or should
> not do about it?
>
> Thanks,
> Davy
>
>
>
>
>
> BTW- df -k looks like
> # df -k
> Filesystem 1K-blocks Used Available Use% Mounted on
> /dev/ide/host0/bus0/target0/lun0/part1
> 2054064 493660 1454380 26% /
> /dev/ide/host0/bus0/target0/lun0/part6
> 33690964 -73786976294838186940 31971456 101% /home
>
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