<html><head><meta http-equiv="Content-Type" content="text/html charset=iso-8859-1"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; ">Thanks for the link !<div>some amazing benches around :) Let's hope we'll have more details on the methodology, but some results are stunning</div><div><br><div apple-content-edited="true">
<span class="Apple-style-span" style="color: rgb(0, 0, 0); font-size: medium; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-align: -webkit-auto; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; border-collapse: separate; font-family: 'Lucida Grande'; border-spacing: 0px; -webkit-text-decorations-in-effect: none; "><span class="Apple-style-span" style="font-weight: normal; font-family: Helvetica; "><b style="color: rgb(19, 112, 138); ">Razique Mahroua</b></span><span class="Apple-style-span" style="font-weight: normal; font-family: Helvetica; color: rgb(19, 112, 138); "><b> - </b></span><span class="Apple-style-span" style="font-family: Helvetica; "><span class="Apple-style-span" style="font-weight: normal; font-family: Helvetica; "><b style="color: rgb(19, 112, 138); ">Nuage & Co</b></span><span class="Apple-style-span" style="border-collapse: separate; font-family: Helvetica; font-style: normal; font-variant: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-align: -webkit-auto; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; border-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; font-size: medium; "><span class="Apple-style-span" style="color: rgb(0, 0, 0); font-family: Helvetica; font-size: medium; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-align: -webkit-auto; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; border-collapse: separate; border-spacing: 0px; -webkit-text-decorations-in-effect: none; "><span class="Apple-style-span" style="border-collapse: separate; font-variant: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-align: -webkit-auto; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; border-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; "><div style="font-weight: normal; color: rgb(0, 0, 0); font-family: Helvetica; font-size: medium; font-style: normal; "><font class="Apple-style-span" color="#13708a"><a href="mailto:razique.mahroua@gmail.com">razique.mahroua@gmail.com</a></font></div><div style="color: rgb(0, 0, 0); font-family: Helvetica; font-size: medium; font-style: normal; "><font class="Apple-style-span" color="#13708a">Tel : +33 9 72 37 94 15</font></div></span></span></span></span></span><br class="Apple-interchange-newline"><span><img height="112" width="125" id="8c78b843-b033-4eb1-8642-8dd90a95d01a" apple-width="yes" apple-height="yes" src="cid:A291A72D-4527-46F1-AFB4-62F5A5F22455@fabrique.lan"></span>
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<br><div><div>Le 17 janv. 2013 à 01:54, Blair Bethwaite <<a href="mailto:blair.bethwaite@gmail.com">blair.bethwaite@gmail.com</a>> a écrit :</div><br class="Apple-interchange-newline"><blockquote type="cite"><div dir="ltr"><div class="gmail_extra"><div class="gmail_quote">On 17 January 2013 09:48, Sean Bigdatafun <span dir="ltr"><<a href="mailto:sean.bigdatafun@gmail.com" target="_blank">sean.bigdatafun@gmail.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;padding-left:1ex">IMO, it's always a tradeoff. I am just very curious how Amazon configures its EC2 hardware. <br>
</blockquote><div><br></div><div style="">Good luck getting that information! You might be able to make some guesses from benchmark info though, there is plenty around. This post from Scalyr takes a great all round look at EC2 IO performance, and it's pretty recent data: <a href="http://blog.scalyr.com/2012/10/16/a-systematic-look-at-ec2-io/">http://blog.scalyr.com/2012/10/16/a-systematic-look-at-ec2-io/</a> .</div>
<div style=""><br></div><div style="">Personally, I would guess that for ephemeral drives they use either no RAID at all or RAID10, probably none though, especially as they don't advertise any reliability for these drives. The issue of rebuild performance in parity-based RAID configs and the effect it would have on guest performance would be a significant consideration. Having said that, it's difficult to find reports of ephemeral drive failures, and Amazon don't quote any failure rates themselves.</div>
</div><div><br></div>-- <br>Cheers,<br>~Blairo
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