1. file system 용량 체크
    df -k (free space >10%)

2. mount point 상태
  /etc/vfstab

3. network 부하
  netstat -i (colls/packet * 100 < 2%)

4. cpu 부하
  vmstat (r/ncpu < 3)

5. memory 부하
  vmstat (sr < 200)

6. swap space 용량
  vmstat (swap > 4,000k)

7. Disk 부하
  iostat -x (svc_t < 100)
  iostat -xtn