<div dir="ltr"><div><div><div>Hey Sean,<br></div>Did you found which is the best set up for your RAID?<br></div>I'm facing the same situation here.<br> I've 11 dell r710 servers, with 4x3TB disk each, and I'm wondering if worth it using a RAID5 or JBOD for some server that will run a compute-network-volume node.<br>
</div>Did you got any solution?<br>Thanks in advance<br></div><div class="gmail_extra"><br><br><div class="gmail_quote">On Sat, Jan 12, 2013 at 7:21 PM, Razique Mahroua <span dir="ltr"><<a href="mailto:razique.mahroua@gmail.com" target="_blank">razique.mahroua@gmail.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div style="word-wrap:break-word">Sorry, the first sentence is wrong : <div><div class="im"><blockquote type="cite"><div style="word-wrap:break-word">
Hi,<div>actually, even for a raid 10 you would end up with 3TB usable (more around 2800 GB)</div></div></blockquote></div>In both cases you end up with 2 TB :)</div><div><br></div><div>Regards,</div><div><div>
<span style="border-collapse:separate;font-family:'Lucida Grande';border-spacing:0px"><span style="font-weight:normal;font-family:Helvetica"><b style="color:rgb(19,112,138)">Razique Mahroua</b></span><span style="font-weight:normal;font-family:Helvetica;color:rgb(19,112,138)"><b> - </b></span><span style="font-family:Helvetica"><span style="font-weight:normal;font-family:Helvetica"><b style="color:rgb(19,112,138)">Nuage & Co</b></span><span style="border-collapse:separate;font-family:Helvetica;font-style:normal;font-variant:normal;letter-spacing:normal;line-height:normal;text-align:-webkit-auto;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;border-spacing:0px;font-size:medium"><div class="im">
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<br><div><div>Le 12 janv. 2013 à 22:19, Razique Mahroua <<a href="mailto:razique.mahroua@gmail.com" target="_blank">razique.mahroua@gmail.com</a>> a écrit :</div><br><blockquote type="cite"><div style="word-wrap:break-word">
<div class="im">Hi,<div>actually, even for a raid 10 you would end up with 3TB usable (more around 2800 GB). You could even go for either a RAID6 or RAID10 actually, since you have 4TB you would end up with 2TB in both cases</div>
<div><br></div><div>Performance wise RAID10 is in most cases faster when it comes to reading speed, sometimes slower when it comes to writing speed, it all depends on you controller. You would bench both RAIDs and pick the faster one :)</div>
<div><br></div></div><div><br><div>
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<br><div><div>Le 11 janv. 2013 à 23:23, Sean Bigdatafun <<a href="mailto:sean.bigdatafun@gmail.com" target="_blank">sean.bigdatafun@gmail.com</a>> a écrit :</div><br><blockquote type="cite">Razique,<div><br></div><div>
Let's think of the following scenario, we use Nova to build an EC2-kind of compute cluster. For EC2, they offer </div><div><br></div><div>M1.Small = 1 vCPU + 1.7GB Mem + 160GB Disk</div><div>
M1.Medium = 2vCPU + 3.75GB Mem + 410GB Disk</div><div>M1.Large = 4vCPU + 7.5GB Mem + 850GB Disk</div><div>M1.ExtraLarge = 8.vCPU + 15GB Mem + 1.7TB Dsik</div><div>...</div><div><br></div><div>This means that they at least have 1.7TB disk space on a physical server (presumably 2 x 1TB disk). </div>
<div><br></div><div><br></div><div>What RAID option would we use in designing our cluster? For our Nova compute nodes,</div><div><br></div><div>-- Do we have a JBOD configuration of 2 disks?</div><div>-- do we have a RAID 0 of 2 disks?</div>
<div>-- or do we use more enterprise like RAID 5?</div><div><br></div><div><br></div><div>Thanks and hopefully this starts some discussion in this direction.</div><div><br></div><div>Thanks,</div><div>Sean<br><br><div class="gmail_quote">
On Fri, Jan 11, 2013 at 12:46 AM, Razique Mahroua <span dir="ltr"><<a href="mailto:razique.mahroua@gmail.com" target="_blank">razique.mahroua@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div style="word-wrap:break-word">Hi Sean, <div>I may be wrong, but I think there is not any "best" RAID strategy when it comes to the disk for the nodes or a "normal" one. All RAID type have their pros and cons.</div>
<div>It'a all about security over performance against total space that would end up usable. What RAID controller is that?</div><div><br></div><div>Regards,<br><div>
<span style="border-spacing:0px;text-indent:0px;letter-spacing:normal;font-variant:normal;text-align:-webkit-auto;font-style:normal;line-height:normal;border-collapse:separate;text-transform:none;font-size:medium;white-space:normal;font-family:'Lucida Grande';word-spacing:0px"><span style="font-weight:normal;font-family:Helvetica"><b style="color:rgb(19,112,138)">Razique Mahroua</b></span><span style="font-weight:normal;font-family:Helvetica;color:rgb(19,112,138)"><b> - </b></span><span style="font-family:Helvetica"><span style="font-weight:normal;font-family:Helvetica"><b style="color:rgb(19,112,138)">Nuage & Co</b></span><span style="border-collapse:separate;font-family:Helvetica;font-style:normal;font-variant:normal;letter-spacing:normal;line-height:normal;text-align:-webkit-auto;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;border-spacing:0px;font-size:medium"><span style="border-spacing:0px;text-indent:0px;letter-spacing:normal;font-variant:normal;text-align:-webkit-auto;font-style:normal;font-weight:normal;line-height:normal;border-collapse:separate;text-transform:none;font-size:medium;white-space:normal;font-family:Helvetica;word-spacing:0px"><span style="border-collapse:separate;font-variant:normal;letter-spacing:normal;line-height:normal;text-align:-webkit-auto;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;border-spacing:0px"><div style="font-style:normal;font-size:medium;font-family:Helvetica;font-weight:normal">
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<br><div><div>Le 11 janv. 2013 à 08:36, Sean Bigdatafun <<a href="mailto:sean.bigdatafun@gmail.com" target="_blank">sean.bigdatafun@gmail.com</a>> a écrit :</div><br><blockquote type="cite"><div><div>When I have a set of rack servers that is 1TB * 4 disks in each of it as Nova Compute Node, what is the best RAID (or JBOD) strategy OpenStack community recommend? <div>
<br></div><div>Basically I'd like to know what a normal disk setup a compute node should be using.<br>
<div><br></div><div>Thanks,</div><div>Sean</div></div></div></div>
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