[Pw_forum] SATA vs SAS

[Carlo Nervi]

I'm not an expert, and maybe my infos are old, but I think you are wrong.
Certain SSD have degraded performances, however the best SSD have much
faster access I/O time than than the best HDD. at least for medium
workstation. Cost for Gb is of course much higher for SSD, but in this case
I would go only for a working directory to be placed on a SSD partition
(128 Gb could be enough). I do not know how is the situation for high-end
enterprise solutions or supercomputers, but in this case i suspect that the
special HDDs are not connected via simple SATA or SAS, and in these cases
very probably they are much faster (again at much hgher prices) due several
optimized performances (independent memory cache, for example).

In other words, it depend how much is your budget...
Cheers,
 Carlo



2014-08-07 11:42 GMT+02:00 siddheshwar chopra <sidhusai at gmail.com>:

> Dear Sir,
> I just want to participate in this good discussion. I read somewhere that
> Solid State Hard Disk has LESSER write times than a normal HDD. Yes
> undoubtedly it is the fastest we have in the market with low power
> consumption and zero mechanical failure risk, but at the cost of shorter
> lives and more money.
> Any comments welcome..
>
> Regards,
>
>
> On Thu, Aug 7, 2014 at 2:16 PM, Carlo Nervi <carlo.nervi at unito.it> wrote:
>
>> My two cents: even though there are differences between SAS and SATA,
>> they are not so huge.
>> From this point of view I guess that a fast Solid State Hard Disk would
>> make the difference on the I/O.
>>
>>
>>
>> 2014-08-07 10:06 GMT+02:00 Paolo Giannozzi <paolo.giannozzi at uniud.it>:
>>
>> On Wed, 2014-08-06 at 18:15 -0400, Eduardo Menendez wrote:
>>>
>>> > Is it critical to use SAS disks (compared to SATA) for good
>>> > performance of Quantum ESPRESSO?
>>>
>>> I guess it depends upon the amount of I/O you plan to do
>>>
>>> Paolo
>>>
>>> --
>>> Paolo Giannozzi, Dept. Chemistry&Physics&Environment,
>>> Univ. Udine, via delle Scienze 208, 33100 Udine, Italy
>>> Phone +39-0432-558216, fax +39-0432-558222
>>>
>>> _______________________________________________
>>> Pw_forum mailing list
>>> Pw_forum at pwscf.org
>>> http://pwscf.org/mailman/listinfo/pw_forum
>>>
>>
>>
>>
>> --
>>
>> ------------------------------------------------------------
>> Prof. Carlo Nervi carlo.nervi at unito.it  Tel:+39 0116707507/8
>> Fax: +39 0116707855      -      Dipartimento di Chimica, via
>> P. Giuria 7, 10125 Torino, Italy.    http://lem.ch.unito.it/
>>
>>
>> _______________________________________________
>> Pw_forum mailing list
>> Pw_forum at pwscf.org
>> http://pwscf.org/mailman/listinfo/pw_forum
>>
>
>
>
> --
> *Dr. Siddheshwar chopra,*
>
>
> *M.Sc., Ph.D (Physics)Assistant Professor (Physics),*
> *Amity University, Noida, India.*
>
>
> _______________________________________________
> Pw_forum mailing list
> Pw_forum at pwscf.org
> http://pwscf.org/mailman/listinfo/pw_forum
>



-- 

------------------------------------------------------------
Prof. Carlo Nervi carlo.nervi at unito.it  Tel:+39 0116707507/8
Fax: +39 0116707855      -      Dipartimento di Chimica, via
P. Giuria 7, 10125 Torino, Italy.    http://lem.ch.unito.it/
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.quantum-espresso.org/pipermail/users/attachments/20140807/0fc2b1fd/attachment.html>