Unix Notes - System / Kernel Parameters

sysdef -i

pending

Unix Notes - iostat

iostat -x 5 100

                 extended device statistics
device    r/s    w/s   kr/s   kw/s wait actv  svc_t  %w  %b
md10      1.2   15.2    9.6   19.7  0.1  0.5   35.9   8   8
md11      0.6   15.2    4.8   19.7  0.0  0.5   29.9   0   7
md12      0.6   15.2    4.8   19.7  0.0  0.4   28.1   0   7
md20      0.0    0.0    0.0    0.0  0.0  0.0    0.0   0   0
md21      0.0    0.0    0.0    0.0  0.0  0.0    0.0   0   0

Unix Notes - Server Performance Monitoring with TOP

/usr/local/bin/top

load averages:  1.49,  1.43,  1.52;                    up 0+03:4211:08:29
344 processes: 341 sleeping, 3 on cpu
CPU: 93.9% idle,  5.6% user,  0.5% kernel,  0.0% iowait,  0.0% swap
Memory: 128G phys mem, 33G free mem, 63G swap, 63G free swap

   PID USERNAME LWP PRI NICE  SIZE   RES STATE    TIME    CPU COMMAND
 26167 oracle     1   0    0   64G   64G cpu      0:02 52.42% oracle
 26175 oracle     1   0    0   64G   64G cpu      0:01 24.22% oracle
  4884 oracle     1  59    0 1157M 1153M sleep    4:56 17.69% oracle
 14457 oracle    11  59    0   64G   64G sleep    0:06  7.65% oracle
 14329 oracle    11  59    0   64G   64G sleep    0:12  6.31% oracle
 12036 oracle     1  59    0   64G   64G sleep    0:24  2.34% oracle
  4093 oracle     1  59    0   64G   64G sleep    2:20  1.47% oracle
 12034 oracle    11  59    0   64G   64G sleep    0:05  1.24% oracle
 24352 oracle     1  59    0   64G   64G sleep    0:00  1.08% oracle
 10318 oracle     1  59    0   64G   64G sleep    0:12  1.06% oracle
  4995 oracle     3  43    0   46M   34M sleep    0:33  0.71% tnslsnr
  4527 oracle     1  59    0   64G   64G sleep    0:21  0.55% oracle
  5939 oracle     1  59    0   64G   64G sleep    0:00  0.47% oracle
  8863 oracle     1  59    0   64G   64G sleep    0:07  0.42% oracle
 23943 jvogel     1  59    0 3816K 2832K cpu      0:02  0.38% top

Unit Notes - vmstat (virtual memory statistics)

Reference: http://en.wikipedia.org/wiki/Vmstat

I've formatted the following example to make it a little easier to read.

$ vmstat 5
  kthr      memory            page             disk            faults        cpu
 r  b w   swap    free   re   mf   pi  po fr de sr m0 m2 m3 m4  in    sy     cs  us sy id
 3  6 0 9901864 4988152 1312 1293 2295 22 47  0  9  1  0  9  1  831    877    90 49 11 40
 0 10 0 6819504 2078880 1153 5777 4383  5  3  0  0  0  0  1  1 4642 188881 18478 32 12 57
 0  9 0 6813976 2075208 1350 7623 4380  6  6  0  0  0  0  2 18 5293 171861 18412 32 15 53
 0 10 0 6793096 2060464 1587 5025 4361 16 14  0  0  0  0  2  0 5773 192402 19898 31  9 59
 0 12 0 6781504 2046376 1865 8465 4436 16 16  0  0  0  0  7  0 6014 185604 17696 48 11 41
 0  6 0 6786576 2049600 1269 5981 4369  8  8  0  0  2  0  2  0 5592 203470 21790 35 10 55 

In this specific example, we are having issues with blocking.