On Fri, 2009-03-06 at 12:05 -0500, Pablo Sanchez wrote:
> [ Comments below, in line ]

Ditto, as always and as should be.  :-)

> Hi Brian,

Hi Pablo,

> Try the same test and while simultaneously running `sar -d 3 1000' 

I used 5 second intervals rather than 3, but the message is still the
same:

02:54:07 PM       DEV       tps  rd_sec/s  wr_sec/s  avgrq-sz  avgqu-sz     
await     svctm     %util
02:54:12 PM    dev8-0      8.38     63.87     21.16     10.14      0.05      
5.71      5.33      4.47
02:54:17 PM    dev8-0    111.62    796.79   1668.54     22.09      1.39     
12.47      2.89     32.22
02:54:22 PM    dev8-0    127.94    881.44   4906.99     45.24      1.60     
12.51      3.19     40.80
02:54:27 PM    dev8-0     92.81    570.06   9930.14    113.13      2.29     
24.67      4.88     45.27
02:54:32 PM    dev8-0    123.85    766.33  10835.27     93.68      3.45     
27.88      4.90     60.68
02:54:37 PM    dev8-0     86.00    800.00   6596.40     86.00      1.97     
22.81      5.14     44.24
02:54:42 PM    dev8-0    113.83    966.73  11611.62    110.50      2.36     
20.75      4.73     53.87
02:54:47 PM    dev8-0    117.40    723.20  12443.20    112.15      4.25     
36.19      4.31     50.64
02:54:52 PM    dev8-0     91.40    611.20   6614.80     79.06      1.45     
15.85      5.40     49.36
02:54:57 PM    dev8-0    102.40    573.25  18174.45    183.09     14.36    
102.95      5.44     55.73
02:55:02 PM    dev8-0    108.84    829.32   1699.20     23.23      0.74     
42.10      3.99     43.37
02:55:07 PM    dev8-0     77.14    453.28   5373.36     75.54      1.85     
24.04      6.95     53.60
02:55:12 PM    dev8-0    101.41    846.68  10066.00    107.61      3.80     
37.40      6.25     63.34

The disk access is not maximized.  But why?

b.

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