<div dir="ltr"><div>I'm not an expert, and maybe my infos are old, but I think you are wrong.<br></div><div>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).</div>
<div><br></div><div>In other words, it depend how much is your budget...</div><div>Cheers,</div><div> Carlo</div><div><br></div></div><div class="gmail_extra"><br><br><div class="gmail_quote">2014-08-07 11:42 GMT+02:00 siddheshwar chopra <span dir="ltr"><<a href="mailto:sidhusai@gmail.com" target="_blank">sidhusai@gmail.com</a>></span>:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr"><div><div><div>Dear Sir,<br></div>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.<br>
</div>Any comments welcome..<br><br></div>Regards,<br></div><div class="gmail_extra"><br><br><div class="gmail_quote">On Thu, Aug 7, 2014 at 2:16 PM, Carlo Nervi <span dir="ltr"><<a href="mailto:carlo.nervi@unito.it" target="_blank">carlo.nervi@unito.it</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr"><div>My two cents: even though there are differences between SAS and SATA, they are not so huge.<br></div>
<div>From this point of view I guess that a fast Solid State Hard Disk would make the difference on the I/O.</div>
<div><br></div><div class="gmail_extra"><br><br><div class="gmail_quote">2014-08-07 10:06 GMT+02:00 Paolo Giannozzi <span dir="ltr"><<a href="mailto:paolo.giannozzi@uniud.it" target="_blank">paolo.giannozzi@uniud.it</a>></span>:<div>
<div><br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">On Wed, 2014-08-06 at 18:15 -0400, Eduardo Menendez wrote:<br>
<br>
> Is it critical to use SAS disks (compared to SATA) for good<br>
> performance of Quantum ESPRESSO?<br>
<br>
I guess it depends upon the amount of I/O you plan to do<br>
<span><font color="#888888"><br>
Paolo<br>
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<div dir="ltr"><div dir="ltr"><span style="color:rgb(204,0,0)"><span style="color:rgb(153,0,255)"><b>Dr. Siddheshwar chopra,</b></span><br>
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