[CentOS] Adding RAM

>> Cpu0  :  5.3% us,  4.0% sy,  0.0% ni, 81.5% id,  9.3% wa,  0.0% hi,  0.0% si
>> Cpu1  : 11.3% us,  8.3% sy,  0.0% ni,  1.7% id, 78.1% wa,  0.7% hi,  0.0% si
>> Mem:   8309188k total,  4761352k used,  3547836k free,   451464k buffers
>> Swap:  2031608k total,      192k used,  2031416k free,  1564316k cached
>
> If this is typical, you don't need more RAM...
> cpu1 is waiting a lot, I/O bottleneck?

A bit of bottle neck.

Device:    rrqm/s wrqm/s   r/s   w/s  rsec/s  wsec/s    rkB/s    wkB/s
avgrq-sz avgqu-sz   await  svctm  %util
sda          0.38 176.63 70.32 78.26  813.46 2044.82   406.73  1022.41
   19.24     0.40   19.17   4.04  60.07
sda1         0.00   0.00  0.00  0.00    0.00    0.00     0.00     0.00
    5.28     0.00   23.61  19.33   0.00
sda2         0.38 176.63 70.32 78.26  813.45 2044.82   406.73  1022.41
   19.24     0.40   19.17   4.04  60.07
dm-0         0.00   0.00 70.71 255.60  813.45 2044.82   406.73
1022.41     8.76     2.90    8.87   1.84  60.10
dm-1         0.00   0.00  0.00  0.00    0.00    0.00     0.00     0.00
    8.00     0.00   64.20  11.38   0.00

Matt