[OpenIndiana-discuss] iostat - sum of the parts

[jason matthews]

I have asked this question before but I am going to try to rephrase it. 

when i look at the output from iostat -nMxCz 1 i see something that looks like following on my shinny new servers running 151a9. I was previously rev-locked on 151a1.

my question is why do the numbers for the zpool not resemble the sum of the parts? for example busy reports 56% for the pool but no device in the pool is more than 40% busy, in this example.

Or why does wait report 5171ms when the devices are report 0. Does wait reflect the flush timer that is 5 seconds by default?


                   extended device statistics              
    r/s          w/s         Mr/s   Mw/s wait actv wsvc_t asvc_t  %w  %b device
 3676.0    30115.6   9.5  140.7    0.1  4.3    0.0    0.1   0   339 c3
  422.0    4002.9    1.3   13.9       0.0  0.5    0.0    0.1   2     40 c3t55CD2E404B41906Cd0
  455.0    3991.0    1.3   14.0       0.0  0.5    0.0    0.1   2     39 c3t55CD2E404B417F40d0
  442.0    4028.9    1.4   14.0       0.0  0.5    0.0    0.1   2     37 c3t55CD2E404B417E7Bd0
  509.0    4008.9    1.2   14.0       0.0  0.5    0.0    0.1   2     36 c3t55CD2E404B417F07d0
  390.0    4001.9    1.2   14.0       0.0  0.5    0.0    0.1   1     38 c3t55CD2E404B417F34d0
  285.0    2033.0    0.7   14.2       0.0  0.3    0.0    0.1   1     27 c3t55CD2E404B41903Dd0
  280.0    2062.0    0.7   14.2       0.0  0.3    0.0    0.1   1     29 c3t55CD2E404B417EDFd0
  301.0    1999.0    0.6   14.2       0.0  0.4    0.0    0.2   1     31 c3t55CD2E404B417F8Ad0
  304.0    2011.0    0.6   14.2       0.0  0.4    0.0    0.2   1     33 c3t55CD2E404B417B32d0
  288.0    1977.0    0.6   14.2       0.0  0.4    0.0    0.2   1     29 c3t55CD2E404B4063DDd0
 3676.0   29045.6    9.5  140.7 5171.0  4.8  158.0    0.1  51  56 data