Re: ext3 issue..

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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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