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<p>Someone please correct me if I am wrong, but that seems a bit
large of an MDT. Of course drives these days are pretty good
sized, so the extra is probably very inexpensive.</p>
<p>Also, isn't it better to have 1 OST per OSS for parallelism
rather than adding OSTs to an OSS? I've been doing most of my OSTs
as ZFS and letting that handle parallel writes across drives
within an OSS, which has performed well.</p>
<p>Brian Andrus<br>
</p>
<br>
<div class="moz-cite-prefix">On 10/30/2017 12:04 PM, Amjad Syed
wrote:<br>
</div>
<blockquote type="cite"
cite="mid:CAJWdRQikz6iOtUOS8nyG8WVj3F7YscQiWtUJ4W1xWxeu7osjhQ@mail.gmail.com">
<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>
<div><br>
</div>
</div>
<div class="gmail_extra"><br>
<div class="gmail_quote">On Mon, Oct 30, 2017 at 7:55 PM, Ben
Evans <span dir="ltr"><<a href="mailto:bevans@cray.com"
target="_blank" moz-do-not-send="true">bevans@cray.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;color:rgb(0,0,0);font-size:14px;font-family:Calibri,sans-serif">
<div>How many OST's are behind that OSS? How many MDT's
behind the MDS?</div>
<div><br>
</div>
<span id="m_-9082209549072038056OLK_SRC_BODY_SECTION">
<div
style="font-family:Calibri;font-size:11pt;text-align:left;color:black;BORDER-BOTTOM:medium
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<span style="font-weight:bold">From: </span>lustre-discuss
<<a
href="mailto:lustre-discuss-bounces@lists.lustre.org"
target="_blank" moz-do-not-send="true">lustre-discuss-bounces@lists.<wbr>lustre.org</a>>
on behalf of Brian Andrus <<a
href="mailto:toomuchit@gmail.com" target="_blank"
moz-do-not-send="true">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" moz-do-not-send="true">lustre-discuss@lists.lustre.<wbr>org</a>"
<<a href="mailto:lustre-discuss@lists.lustre.org"
target="_blank" moz-do-not-send="true">lustre-discuss@lists.lustre.<wbr>org</a>><br>
<span style="font-weight:bold">Subject: </span>Re:
[lustre-discuss] 1 MDS and 1 OSS<br>
</div>
<div>
<div class="h5">
<div><br>
</div>
<div>
<div text="#000000" bgcolor="#FFFFFF">
<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>
</p>
<p><br>
</p>
<br>
<div
class="m_-9082209549072038056moz-cite-prefix">On
10/30/2017 12:47 AM, Amjad Syed wrote:<br>
</div>
<blockquote type="cite">
<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>
<div><br>
</div>
<div>Thanks</div>
<div>Majid</div>
</div>
<br>
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class="m_-9082209549072038056mimeAttachmentHeader"></fieldset>
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