Du -sh . in an eos mounted directory reports double the actual disk usage

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1

I’ve mounted my eos partition onto afs with eosmount eos.

To examine how much data is stored in one of my sub folders, I ran du -sh . in the appropriate folder.

When I copied this folder to my local machine for faster analysis, I did the same operation to make sure all data made it, and found that du -sh . returns half the value:

On lxplus:

mkrafczy on lxplus0094 [16:41:30] ~/eos/ams/user/m/mkrafczy/Jobs/EP_v14_small_v5/Reduced_Analysis/v1 ○ du -sh . 127G .

On my local machine:

matthew on Wagner [17:13:25] ~/AMSData/ProducedData/EP_v14_small_v5 ○ du -sh . 64G .

To make sure they weren’t actually different, I ran the following script on both lxplus and my local machine:

diffing the resulting md5sum_list.txt files from my local machine and lxplus show no difference, implying that they are indeed the same files, and that du -sh . is indeed reporting twice the used disk space on the eos mounted directory.

What is the reason for this?

2

I did du -sh without -h to get exact values, I have:

on lxplus:

mkrafczy on lxplus0094 [17:19:06] ~/eos/ams/user/m/mkrafczy/Jobs/EP_v14_small_v5/Reduced_Analysis/v1 ○ du -s . 132429393

on local machine:

matthew on Wagner [17:19:45] ~/AMSData/ProducedData/EP_v14_small_v5 ○ du -s . 66215104

double what my local machine has is 132430208 which is 815 bytes different from the lxplus result. So not exactly double, but very close.

3

Hi,

you may want to try:

du --apparent-size

From the du manpage:

Cheers,
Jochen

4

Excellent! That was it! Thanks!

mkrafczy on lxplus0078 [11:11:33] ~/eos/ams/user/m/mkrafczy/Jobs/EP_v14_small_v5/Reduced_Analysis/v1 ○ du -s --apparent-size . 66214714