100T seems to work for light use. I can create the filesystem, mount it, write files and directories and read them back, and fsck doesn't report any problems. Filesystem Size Used Avail Use% Mounted on /dev/vda1 99T 129M 94T 1% /sysroot Linux (none) 3.1.0-0.rc6.git0.3.fc16.x86_64 #1 SMP Fri Sep 16 12:26:22 UTC 2011 x86_64 x86_64 x86_64 GNU/Linux e2fsprogs-1.42-0.3.WIP.0925.fc17.x86_64 qcow2 is very usable as a method for testing at this size. Rich. -- Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones libguestfs lets you edit virtual machines. Supports shell scripting, bindings from many languages. http://libguestfs.org -- devel mailing list devel@xxxxxxxxxxxxxxxxxxxxxxx https://admin.fedoraproject.org/mailman/listinfo/devel