Hi Leslie:
As for priority of your swap devices, I'd make the secondary swap device on vg00 a different priority value (e.g. 0, 2 or 3) than the primary device swap which has a priority of one (1). The device with the lower value will have first preference.
While this doesn't matter if you are not actually swapping (and you don't want to come to that!), in the event that actual swap I/O does occur, you will not degrade your vg00 performance as badly as when priorities are equal and I/O to the swap devices is interleaved. Having different priorities means that the device with the higher priority (lower number) will be used first; then the lower priority device.
As Tim noted, if you don't update 'fstab' with the swap declaration, your additional swap will not be activated after a reboot. The primary swap device is NOT declared in 'fstab' --- only secondary ones.
# /dev/vg00/lvol12 ... swap pri=2 0 0
If on the other hand my secondary swap where on a non-vg00 volume group, I might give priority to it over my primary swap on vg00 with:
# /dev/vg01/lvol1 ... swap pri=0 0 0
Giving the secondary swap on a non-vg00 volume group the preference means less I/O to/from vg00 *IF* you actually swap. After all, if you start swapping you don't want to add pain to pain :-)
Regards!
...JRF...
