Using a git pull (as of 10/6/10) of e2fsprogs, mke2fs won't create a file system with partition sizes between 2TB and 4TB. The error reported is:
/dev/sdb1: Cannot create filesystem with requested number of inodes while setting up superblock
This is on a gpt labled RAID array.
Kernel = 184.108.40.206.
This doesn't happen with the mke2fs from the 1.14.12 tarball, but I need to format a 55TB array, so need ext4 from the git pull (which works fine for that).