Agregar area de Swap a una existente

Estos son los comandos, resumidos:

lvcreate -n lv_swap2 -L50g /dev/VolGroup00 mkswap /dev/VolGroup00/lv_swap2 agregar esta linea al /etc/fstab : /dev/mapper/VolGroup00-lv_swap2 swap swap defaults 0 0 swapon -va free -m
Aca esta el paso a paso detallado
[root@plana]# lvcreate -n lv_swap2 -L50g /dev/VolGroup00
Logical volume "lv_swap2" created.

[root@plana]# mkswap /dev/VolGroup00/lv_swap2
mkswap: /dev/VolGroup00/lv_swap2: warning: don't erase bootbits sectors on whole disk.
Use -f to force. Setting up swapspace version 1, size = 52428796 KiB
[root@plana]# vi /etc/fstab (agregar la linea a continuacion descripta)
/dev/mapper/VolGroup00-lv_swap2 swap    swap    defaults        0       0
[root@plan]# swapon -va swapon on /dev/mapper/VolGroup00-lv_swap2
swapon: /dev/mapper/VolGroup00-lv_swap2: found swap signature: version 1, page-size 4, same byte order swapon: /dev/mapper/VolGroup00-lv_swap2: pagesize=4096, swapsize=53687091200, devsize=53687091200
[root@plan]# free -m              total       used       free     shared    buffers     cached
Mem:        258208     169225      88982          0       1642     128652 -/+ buffers/cache:      38931     219277 Swap:        67583       2197      65386
 [root@plan]#