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That doesn't exactly work.

echo "a" > a; du -sh a; rm a

2.0K a

dumpe2fs /dev/sda1 | grep -i 'Block size'

Block size: 1024

Interesting. Still, I'm no sysadmin; the point is that demonstrating you know how to find something out short of google is better than... well, not.

I'm curious how you got that. Are you sure "a" is on /dev/sda1? What OS and FS are you using?

$ du -sh /tmp/a

4.0K a

$ tune2fs -l /dev/mapper/VolGroup00-LogVol00 | grep "Block size"

Block size: 4096

Positive that 'a' is on /dev/sda1. Running CentOS 5.5 and /dev/sda1 is ext3.

I get similar behavior on the other partition:

echo "a" > a; du -sh a

8.0K a

dumpe2fs /dev/VolGroup00/LogVol00 | grep "Block size"

Block size: 4096

Though if I 'touch' the files to create them, they are the blocksize. Which seems odd, since on my AIX and HP-UX boxes that gives files of size 0.