UFS and spreading data

[Wojciech Puchar]

AFAIK UFS try to spread data quite evenly on disk to different cylinder 
group - for large files, so small files can get it's space near inodes 
etc..


but i would like to clear things up:

i will set up say 3 disks with gconcat and make one partition for all data 
on it. then i will populate it with all things and use it.

will the data be quite spread on disks, so accesses to different things 
could be done in parallel to 3 disks, or will it rather use space on one 
disk first, then on second then on third.


i'm asking about it as i prefer gconcat over gstripe as i can add more 
disks to gconcat and do growfs then making system EASILY expandable.