I rebooted my server but fsck started forcibly on boot and it took long time until the system started.
To show or adjust fsck timing on ext2/ext3/ext4 filesystem, you can use tune2fs.

Show

# tune2fs -l /dev/sda1
・・・(omitted)
Mount count:              7
Maximum mount count:      27
Last checked:             Fri Oct 21 03:41:32 2011
Check interval:           15552000 (6 months)
Next check after:         Wed Apr 18 03:41:32 2012
・・・(omitted)

Stop forcible fsck

# tune2fs -c 0 -i 0 /dev/sda1 
tune2fs 1.39 (29-May-2006)
Setting maximal mount count to -1
Setting interval between checks to 0 seconds

Confirmation

# tune2fs -l /dev/sda1
・・・(omitted)
Mount count:              7
Maximum mount count:      -1
Last checked:             Fri Oct 21 03:41:32 2011
Check interval:           0 (<none>)
・・・(omitted)

Source: tune2fs でfsckを制御 - ike-daiの日記