I am migrating to a new server where I'm going to use LVM partitioning on a RAID 1 array (2 hard drives). I have read some tutorials which advise to leave some space unused so that I can expand the partition later, if needed.
Now, with the new hardware that is large for my uses, I could afford that, but I wonder if this makes any sense: why would I do that? Is it somehow easier, say, to expand /var into unused space later on, than to shrink main partition and expand /var?