gvinum mirror seems to use only one disk for reading

[Deomid Ryabkov]

Deomid Ryabkov wrote:

>
>>> writes go to both drives as they should and tps numbers are the 
>>> same, as expected, but "time spent processing requests" is different 
>>> for da0 and da1.
>>
>>
>>
>> I've no idea yet, why that happens.  Have you checked out gstat(8) 
>> and how the numbers compare there?
>>
> about same: da0 getting about twice the load when writing.
> sample snapshot of gstat with dd if=/dev/zero of=/usr/test in background:
>
> dT: 2.009  flag_I 2000000us  sizeof 240  i -1
> L(q)  ops/s    r/s   kBps   ms/r    w/s   kBps   ms/w   %busy Name
>    0      0      0      0    0.0      0      0    0.0    0.0| fd0
>    0     85      0      0    0.0     85  10550    3.7   31.2| da0
>    0     84      0      0    0.0     84  10486    2.1   17.4| da1
>    0     85      0      0    0.0     85  10550    3.8   31.5| da0s1
>    0     84      0      0    0.0     84  10486    2.1   17.7| da1s1

well, it actually seems like percentage is computed incorrectly for 
either of drives,
since kbps and transaction values are identical.

--
Deomid Ryabkov aka Rojer
myself at rojer.pp.ru
rojer at sysadmins.ru
ICQ: 8025844

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