Fast fsck by hand and by feature

One should pay attention how many i-nodes creates on its ext3 FS. By reducing i-nodes, fsck
time is reduced too. Anyway there is no possibility to reduce or increase number of i-nodes
without reformating FS so one must figure out how many i-nodes to create for own use and then
do backup/reformat/restore.

Ext4 will have an ability to know what i-nodes are not used so fsck should be fast even
zillions wasted space with unused i-nodes will be in place on your not-tuned-FS.