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<div>It's not going to matter. There aren't enough physical drives to push the Infiniband link, unless they're all SSDs.</div>
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<span style="font-weight:bold">From: </span>Simon Guilbault <<a href="mailto:simon.guilbault@calculquebec.ca">simon.guilbault@calculquebec.ca</a>><br>
<span style="font-weight:bold">Date: </span>Monday, October 30, 2017 at 3:13 PM<br>
<span style="font-weight:bold">To: </span>Amjad Syed <<a href="mailto:amjadcsu@gmail.com">amjadcsu@gmail.com</a>><br>
<span style="font-weight:bold">Cc: </span>Ben Evans <<a href="mailto:bevans@cray.com">bevans@cray.com</a>>, "<a href="mailto:lustre-discuss@lists.lustre.org">lustre-discuss@lists.lustre.org</a>" <<a href="mailto:lustre-discuss@lists.lustre.org">lustre-discuss@lists.lustre.org</a>><br>
<span style="font-weight:bold">Subject: </span>Re: [lustre-discuss] 1 MDS and 1 OSS<br>
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<div dir="ltr">Hi,
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<div>If everything is connected with SAS JBOD and controllers, you could probably run 1 OST on each server and get better performance that way. With both server reaching the same SAS drives, you could also have a failover in case one server does not work.
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<div>You can forget about failover if you are using SATA drives. </div>
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<div class="gmail_quote">On Mon, Oct 30, 2017 at 3:04 PM, Amjad Syed <span dir="ltr">
<<a href="mailto:amjadcsu@gmail.com" target="_blank">amjadcsu@gmail.com</a>></span> wrote:<br>
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<div dir="ltr">The vendor has proposed a single MDT ( 4 * 1.2 TB) in RAID 10 configuration.
<div>The OST will be RAID 6 and proposed are 2 OST.</div>
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<div class="h5">On Mon, Oct 30, 2017 at 7:55 PM, Ben Evans <span dir="ltr"><<a href="mailto:bevans@cray.com" target="_blank">bevans@cray.com</a>></span> wrote:<br>
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<div>How many OST's are behind that OSS? How many MDT's behind the MDS?</div>
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<span style="font-weight:bold">From: </span>lustre-discuss <<a href="mailto:lustre-discuss-bounces@lists.lustre.org" target="_blank">lustre-discuss-bounces@lists.<wbr>lustre.org</a>> on behalf of Brian Andrus <<a href="mailto:toomuchit@gmail.com" target="_blank">toomuchit@gmail.com</a>><br>
<span style="font-weight:bold">Date: </span>Monday, October 30, 2017 at 12:24 PM<br>
<span style="font-weight:bold">To: </span>"<a href="mailto:lustre-discuss@lists.lustre.org" target="_blank">lustre-discuss@lists.lustre.o<wbr>rg</a>" <<a href="mailto:lustre-discuss@lists.lustre.org" target="_blank">lustre-discuss@lists.lustre.o<wbr>rg</a>><br>
<span style="font-weight:bold">Subject: </span>Re: [lustre-discuss] 1 MDS and 1 OSS<br>
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<p>Hmm. That is an odd one from a quick thought...</p>
<p>However, IF you are planning on growing and adding OSSes/OSTs, this is not a bad way to get started and used to how everything works. It is basically a single stripe storage.</p>
<p>If you are not planning on growing, I would lean towards gluster on 2 boxes. I do that often, actually. A single MDS/OSS has zero redundancy, unless something is being done at harware level and that would help in availability.<br>
NFS is quite viable too, but you would be splitting the available storage on 2 boxes.</p>
<p>Brian Andrus<br>
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<div class="m_-820646351502650071m_-9082209549072038056moz-cite-prefix">On 10/30/2017 12:47 AM, Amjad Syed wrote:<br>
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<div dir="ltr">Hello
<div>We are in process in procuring one small Lustre filesystem giving us 120 TB of storage using Lustre 2.X.</div>
<div>The vendor has proposed only 1 MDS and 1 OSS as a solution.</div>
<div>The query we have is that is this configuration enough , or we need more OSS?</div>
<div>The MDS and OSS server are identical with regards to RAM (64 GB) and HDD (300GB)</div>
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<div>Thanks</div>
<div>Majid</div>
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