how to decrease the Priority to 1 in place of 2 as described below?
swapon -s Filename Type Size Used Priority dev/cciss/c0d0p6 partition 8385888 0 -2
You can use
But you only have priority if you have more than one swap space. The first space gets -1, the second -2, and so on. It makes little sense to have multiple swap spaces at the same priority (unless you want to make a round-robin allocation of swap space), just make sure to put your faster space as the lowest priority.
The priority you are seeing is negative. If you do not specify a priority, the first swap device you add since boot has priority
The only thing this priority affects is the order in which swap devices are used (higher priority devices are searched first). If you only have one swap device, it does not make any difference.