Re: [Scalablecr-discuss] local storage reliability experience?

[Kathryn M. <ka...@ll...>]

Hi Andrew,

> I was reading through
> http://www.csm.ornl.gov/srt/conferences/ResilienceSummit/2009/pdf/moody_slides.pdf
> and I was wondering what people's experience with using SCR on local
> SSDs or disks has been. Was it worth putting an SSD in each node of
> Coastal?

Our experience was that it was useful, especially for applications that use all their memory and can't store checkpoints in RAM disk. That said, overall we are still evaluating the usefulness vs. cost of attaching SSDs to compute nodes. The SSDs on Coastal were an early generation and not as long-lasting or efficient as newer models. 

> Also has anyone used SCR for non-checkpoint files?

I am not aware of it, although you might be able to get it to work out of the box depending on how you plan to use the files. What I mean is, if it's OK with your application that SCR treats those files like checkpoints (meaning possibly deletes older ones when new ones are written), then it should be fine. Otherwise, you would need to copy each file out to your parallel file system, which would defeat the purpose of using SCR. 

That said, we are planning to add support for ordinary files into SCR in the future. It would be interesting to hear what your use case is and how SCR could best support that.

Best,
Kathryn

> 
> Thank you,
> 
> -- 
> Andrew Shewmaker
> 
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_________________________________________________________________
Kathryn Mohror, ka...@ll..., http://scalability.llnl.gov/
Scalability Team @ Lawrence Livermore National Laboratory, Livermore, CA, USA