[ale] rsync issues

[ale at cogginsnet.com (Robert Coggins)]

good evening all,

If I run the following command 2 times in a row I should have data
transferred only the first time right?

rsync -rlptDv /mnt/dir1 /mnt/dir2

where /mnt/dir1 is a local drive with ext
and /mnt/dir2 is a buffalo nas mount

Or, would it try to copy again if I am not copying owner/grp info?

I run this twice in a row and it copies all the data every time...

Thanks!

Rob