[Disksim-users] Fwd: How to Fix the Saturation Error Due to Heavy Workload!

[Peyman Behzadnia]

Thanks Greg.

I appreciate if someone has an idea about parameters&configurations to fix
this error? Has anybody had a similiar situatio before?

Best,
Peyman

---------- Forwarded message ----------
From: Greg Ganger <ganger at ece.cmu.edu>
Date: Tue, Feb 8, 2011 at 7:42 PM
Subject: Re: [Disksim-users] How to Fix the Saturation Error Due to Heavy
Workload!
To: Peyman Behzadnia <pbehzadn at mail.usf.edu>
Cc: Greg Ganger <ganger at ece.cmu.edu>



No, I'm sorry, but I can't know that.  Look at the throughput you see
with less intense worklaods to project what it is capable of doing.


Good luck,

Greg


On Tue, 8 Feb 2011, Peyman Behzadnia wrote:

Dear Greg,
>
> Thanks for your comment.
> Can you please let me know how to increase the tolerance of the simulated
> system through configurations and parameters? My system includes 10 disks
> each connected to one bus and one controller and these are connected to one
> higher level bus, controller and finally the driver.
>
> Thanks
> Peyman
>
> On Tue, Feb 8, 2011 at 7:30 PM, Greg Ganger <ganger at ece.cmu.edu> wrote:
>
>
>> The saturation error happens because the workload is heavier than the
>> simualted storage system can handle... not because the simulator itself
>> can't keep up.
>>
>> Good luck,
>>
>> Greg
>>
>>
>>
>> On Tue, 8 Feb 2011, Peyman Behzadnia wrote:
>>
>> Dear All,
>>
>>>
>>> This is Peyman Behzadnia, a PhD student in Computer Science &
>>> Engineering.
>>> I'm contacting you guys regarding the 'Saturation Error' of the disksim.
>>>
>>> I've run a simulation on top of the disksim4 in which i have to feed the
>>> simulator with my ascii-format workload with high intensity (100-700
>>> requests per second). The problem is that the disksim has constantly
>>> given
>>> the saturation error: the simulation stopped due to saturation. I have
>>> re-checked all of the detailed parameters in my parameter file and also
>>> have
>>> tested my workload with the sample parameter files provided by the
>>> disksim.
>>> But, it gives the same error. When i decrease the intensity into 1
>>> request
>>> per 1-2seconds, it works well.
>>> I personally do not believe that such disk simulator can not even handle
>>> 20
>>> requests per second. It might be something about a configuration. I
>>> appreciate if somebody can give me a hint or comment about how to fix
>>> this
>>> saturation error.
>>>
>>> Best,
>>> Peyman
>>>
>>>
>>>
>
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