parted partition alignment

I just tested in a vm with centos 6.7:

# parted /dev/sdb 
GNU Parted 2.1
Using /dev/sdb
Welcome to GNU Parted! Type 'help' to view a list of commands.
(parted) print
Error: /dev/sdb: unrecognised disk label                                  

(parted) mklabel gpt                                                      
(parted) mkpart primary 1m 100%
(parted) quit                                                             
Information: You may need to update /etc/fstab.                           

[root@localhost ~]# parted /dev/sdb print 
Model: VMware Virtual disk (scsi)
Disk /dev/sdb: 1074MB
Sector size (logical/physical): 512B/512B
Partition Table: gpt

Number  Start   End     Size    File system  Name     Flags
 1      1049kB  1073MB  1072MB               primary

[root@localhost ~]# parted /dev/sdb "unit s print"
Model: VMware Virtual disk (scsi)
Disk /dev/sdb: 2097152s
Sector size (logical/physical): 512B/512B
Partition Table: gpt

Number  Start  End       Size      File system  Name     Flags
 1      2048s  2095103s  2093056s               primary