devices in linux

1.iostat reports CPU, disk I/O, and NFS statistics.

# iostat
Linux 2.6.32-71.el6.i686 (acer)     08/26/2011     _i686_    (1 CPU)

avg-cpu:  %user   %nice %system %iowait  %steal   %idle
          18.29    0.02    2.86    1.50    0.00   77.33

Device:            tps   Blk_read/s   Blk_wrtn/s   Blk_read   Blk_wrtn
sda               3.39        46.64       114.26    2038820    4994648
dm-0              8.78        42.51        58.56    1858074    2559816
dm-1              0.01         0.06         0.00       2696          0
dm-2              7.20         3.82        55.70     167018    2434800

dm  :   devices  in  LVM  

#sudo lvdisplay|awk  '/LV Name/{n=$3} /Block device/{d=$3; sub(".*:","dm-",d); print d,n;}'
dm-0 /dev/vg_xiao/LV_root
dm-1 /dev/vg_xiao/LV_swp
dm-2 /dev/vg_xiao/LV_home

可以#iostat   -N   
Linux 2.6.32-71.el6.i686 (acer)     08/26/2011     _i686_    (1 CPU)

avg-cpu:  %user   %nice %system %iowait  %steal   %idle
          18.55    0.02    2.94    1.49    0.00   77.00

Device:            tps   Blk_read/s   Blk_wrtn/s   Blk_read   Blk_wrtn
sda               3.42        45.76       119.64    2045832    5348832
vg_xiao-LV_root     9.27        41.71        62.72    1864730    2804008
vg_xiao-LV_swp     0.01         0.06         0.05       2736       2120
vg_xiao-LV_home     7.34         3.74        56.87     167234    2542672