'mkvdisk command.
svctask mkvdisk -name <name> -mdiskgrp <mdiskgrp> -iogrp <iogrp>
-size <size> -unit <unit>'

def _cmd_mkvdisk(self, **kwargs):

    if (('name' not in kwargs) or ('size' not in kwargs) or ('unit' not in kwargs)):
        return self._errors['CMMVC50000']
    vdisk_info = {}
    vdisk_info['id'] = self._find_unused_id(self._volumes_list)
    vdisk_info['name'] = kwargs['name'].strip('\'"')
    vdisk_info['status'] = 'online'
    vdisk_info['capacity'] = self._convert_units_bytes(int(kwargs['size']), kwargs['unit'])
    vdisk_info['vdisk_UID'] = (('60050760' + ('0' * 14)) + vdisk_info['id'])
    if (vdisk_info['name'] in self._volumes_list):
        return self._errors['CMMVC50000']
    else:
        self._volumes_list[vdisk_info['name']] = vdisk_info
        return (('Virtual    Disk,    id    [%s],    successfully    created' % vdisk_info['id']), '')
