Thierry: Half joking, I'll point out that anybody can have root on an Ubuntu system for an hour for only $0.10 with EC2.
More seriously: If the benefit of the rsync approach is only to increase the number of inodes, perhaps the original mke2fs could be run with the -N option to increase the number of inodes to something reasonable for both 2GB and 10GB.
The truncate method certainly seems like it would be faster than the rsync.
Thierry: Half joking, I'll point out that anybody can have root on an Ubuntu system for an hour for only $0.10 with EC2.
More seriously: If the benefit of the rsync approach is only to increase the number of inodes, perhaps the original mke2fs could be run with the -N option to increase the number of inodes to something reasonable for both 2GB and 10GB.
The truncate method certainly seems like it would be faster than the rsync.