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iostat as a tool for generating disk IO

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Operating Systems Solaris iostat as a tool for generating disk IO
# 15  
Old 06-30-2010
Just use the -n switch of iostat to get the logical device names instead of the instance names.

Code:
$ iostat -xn
                    extended device statistics
    r/s    w/s   kr/s   kw/s wait actv wsvc_t asvc_t  %w  %b device
    2.5    0.7   19.8    2.4  0.0  0.0    0.0    2.5   0   0 c0t0d0
    0.7    0.4   19.0    1.1  0.0  0.0    0.0    3.7   0   0 md/globfs/d10
    0.7    0.4   19.0    1.1  0.0  0.0    0.0    3.8   0   0 md/globfs/d20
    1.3    0.4   38.0    1.1  0.0  0.0    0.4    2.9   0   0 md/globfs/d0
    0.0    0.0    0.0    0.0  0.0  0.0    0.0   10.4   0   0 md/globfs/d51
    0.0    0.0    0.0    0.0  0.0  0.0    0.0    6.2   0   0 md/globfs/d50
    1.3    0.4   38.0    1.1  0.0  0.0    0.0    3.3   0   0 md/globfs/d52
    0.0    0.0    0.0    0.0  0.0  0.0    0.0    0.0   0   0 c1t0d0
    0.0    1.8    3.5  170.1  0.0  0.3    0.0  172.9   0   1 c6t60060160E1F02100686FCAB3D446DF11d0
    0.0    1.9    3.1  171.6  0.0  0.3    0.0  166.0   0   1 c6t60060160E1F021006A6FCAB3D446DF11d0
    0.0    2.0    2.5  186.8  0.0  0.4    0.0  177.1   0   1 c6t60060160E1F021006E6FCAB3D446DF11d0
    0.0    2.0    2.3  186.9  0.0  0.4    0.0  178.8   0   1 c6t60060160E1F021006F6FCAB3D446DF11d0
    0.0    2.0    2.6  186.8  0.0  0.4    0.0  173.9   0   1 c6t60060160E1F021006D6FCAB3D446DF11d0
...



---------- Post updated at 07:57 ---------- Previous update was at 07:41 ----------

You can see your EMC LUNs on Controller c1 and c3 without multipathing.

It seems, that EMC powerpath does not provide iostat information, because the pseudo devices are missing from the iostat output. I never used powerpath on our systems, always MPxIO. It works very well with Clariions and gives you disk IO measurements as shown above.
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