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may be some part in drive 1 and other part in drive2
Wait, the files got split up on both drives? Damn!
df -h /backup
Filesystem Size Used Avail Use% Mounted on
3.6T 1.7T 1.7T 50% /
Doesn't tell me which one of the two drives is actually holding the files.
I may be completely wrong but surely all the files are on both drives. Isn't that what a
volume does ?
You could see as root if this sheds any light:
updatedb; locate FILE
look at the first part of the path eg /var or /usr
then use df -h to see which /dev/LogVol00 the partition belongs to. Not sure about it though
to be honest.