which mirror balance algorithm to use?

[OxY]

thanks a lot, i choosed load balance, one
of my disks is slow.
performance is great, load is low :)
thxx!
best wishes!

----- Original Message ----- 
From: "Terje Elde" <terje+geom at elde.net>
To: "OxY" <oxy at field.hu>
Cc: <freebsd-geom at freebsd.org>
Sent: Monday, February 27, 2006 12:19 AM
Subject: Re: which mirror balance algorithm to use?


> OxY wrote:
>> my box is a file server, it has about ~100-150 simultaneous connection
>> all the time, so the disks are very busy..
>> i'd like to use the best performance balance algorithm to reduce disk 
>> load, which is about 80-90% now..
>> which one should i use? 'load' and 'round-robin'?
>> why?
>>   
> 
> There are many factors here.  If you're using both slow and fast disks, 
> using the load algorithm might have some advantages for example.
> 
> I know this isn't the answer you want, but the best way to go about this 
> might actually be to test the different algorithms.  It's easy enough to 
> change, and then you can run up some numbers on how well it seem to be 
> performing with the different ones in your setup.  Best thing would be 
> if you could run with a simulated load after hours, so you can get the 
> exact same test patterns run for the different algorithms.  Combine with 
> trying them out with real world load, and things should get interesting.
> 
> Terje
> 
>