결론은 2M 부터 가능
- Try smaller and smaller sizes until you find the limit. This will be tedious---at least using fdisk, I can't create a new partition and install a file system without rebooting
$ dd if=/dev/zero of=disk-image count=4096 4096+0 records in 4096+0 records out 2097152 bytes (2.1 MB) copied, 0.0406892 s, 51.5 MB/s $ ls -l disk-image -rw-r--r--. 1 colucix users 2097152 May 24 12:04 disk-image $ /sbin/mkfs -t ext4 -q disk-image disk-image is not a block special device. Proceed anyway? (y,n) y $ file disk-image disk-image: Linux rev 1.0 ext4 filesystem data (extents) (huge files)
- The limit of an ext4 filesystem should be 4096 blocks of 512 bytes, that is about 2 Mb. It depends on the minimum size to store the filesystem journal, other than inode and superblock sizes that are smaller. This is from a theoretical point of view, since - as already pointed out - a physically minimum filesystem is not usable.