3 Replies Latest reply: Mar 7, 2011 2:36 AM by BrendonHiggins RSS

sysstat and statit

bipul34.gogoi Novice
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Hi all ,

 

I am trying to find out some relation ( formula !!)  . First , for sysstat ...

 

CPU   NFS  CIFS  HTTP   Total    Net kB/s   Disk kB/s     Tape kB/s Cache Cache  CP   CP Disk    FCP iSCSI   FCP  kB/s
                                                    in   out   read  write  read write   age   hit time  ty util                 in   out
32%   430     0     0          430  1923   128    348    972     0     0    32  100% 100%  Bv  75%      0     0     0     0
20%   386     0     0          386  1725   116    256    612     0     0    32  100% 100%  Bv  73%      0     0     0     0

 

Whats the relation between TOTAL IOPS and Disk KB/s (Read+write) , Above output is from a load testing with 4KB IO.. (1923+128/430= 4.76)

 

 

Secondly , How those relations can be related to invidual disk IOPS

 

Statit o/p

 

disk             ut% xfers  ureads--chain-usecs writes--chain-usecs cpreads-chain-usecs greads--chain-usecs gwrites-chain-usecs
/aggr4/plex0/rg0:
v5.26             15   6.37    0.09   1.00 365417   6.19   2.03 13595   0.09   4.35  5600   0.00   ....     .   0.00   ....     .
v5.27             16   6.57    0.09   1.00 450435   6.39   2.03 13724   0.09   3.68  6914   0.00   ....     .   0.00   ....     .
v5.28             19   8.10    1.21   1.00 52718   4.87   1.69 20546   2.03   2.65  8867   0.00   ....     .   0.00   ....     .
v5.29             14   5.76    1.18   1.00 49934   2.28   2.50 10604   2.31   2.21 12602   0.00   ....     .   0.00   ....     .
v5.32             14   5.76    1.18   1.00 51887   2.28   2.50 10646   2.31   2.22 12357   0.00   ....     .   0.00   ....     .

 

Note : v5.26 and v5.27 are parity disk .

 

From documeantation i can see that Xfers is "total number of disk ops" .  Whats the relation (formula) between Xfers from statit o/p and Total IOPS from sysstat command ..

 

 

Thanks in advanced

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