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I'm no longer the parted maintainer, re-assigning.

Reproduced on RHEl 6.1 in KVM guest. Tested on latest 6.2 nightly:

# rpm -q parted 
parted-2.1-14.el6.x86_64

# parted /dev/vdb -s mkpart primary 0 1GB
Warning: The resulting partition is not properly aligned for best performance.

# parted /dev/vdb -s print
Model: Virtio Block Device (virtblk)
Disk /dev/vdb: 10.7GB
Sector size (logical/physical): 512B/512B
Partition Table: msdos

Number  Start  End     Size    Type     File system  Flags
 1      512B   1000MB  1000MB  primary

#

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

http://rhn.redhat.com/errata/RHBA-2011-1626.html