Thanks,

df -i, indicates my filesystems in 512k blocks
df -k, indicates my filesystems in 1024k blocks.

This can't be the block size can it, it looks like I can display the block size anyway I want.

I am more looking for the i/o block size . I thought the block size was set in the fragment size during the jfs creation. But this is where I am confused because I can only go as high as 4k there.

Where do you set the block size?