Just need a simple answer, did some searching and couldn't find it. What is the metadata overhead with ext3 as compared to ext4? I migrated a number of volumes from a SAN that was using ext4 volumes to a new storage array that is formatted as ext3 and the volumes are anywhere from 2-3% to 11% larger. Average increase is about 6.5% across the board. Everything is working and all of the files are there with plenty of space to spare so not a major issue, but I thought a 6+% percent difference seems a bit high to me.