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<TITLE>RE: [Lustre-discuss] MDT raid parameters, multiple MGSes</TITLE>
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<P><FONT SIZE=2>In our lab, we've never had a problem with simply having 1 MGS per filesystem. Mountpoints will be unique for all of them, but functionally it works just fine.<BR>
<BR>
-Ben Evans<BR>
<BR>
<BR>
-----Original Message-----<BR>
From: lustre-discuss-bounces@lists.lustre.org on behalf of Thomas Roth<BR>
Sent: Fri 1/21/2011 6:43 AM<BR>
To: lustre-discuss@lists.lustre.org<BR>
Subject: [Lustre-discuss] MDT raid parameters, multiple MGSes<BR>
<BR>
Hi all,<BR>
<BR>
we have gotten new MDS hardware, and I've got two questions:<BR>
<BR>
What are the recommendations for the RAID configuration and formatting<BR>
options?<BR>
I was following the recent discussion about these aspects on an OST:<BR>
chunk size, strip size, stride-size, stripe-width etc. in the light of<BR>
the 1MB chunks of Lustre ... So what about the MDT? I will have a RAID<BR>
10 that consists of 11 RAID-1 pairs striped over. giving me roughly 3TB<BR>
of space. What would be the correct value for <insert your favorite<BR>
term>, the amount of data written to one disk before proceeding to the<BR>
next disk?<BR>
<BR>
Secondly, it is not yet decided whether we wouldn't use this hardware to<BR>
set up a second Lustre cluster. The manual recommends to have only one<BR>
MGS per site, but doesn't elaborate: what would be the drawback of<BR>
having two MGSes, two different network addresses the clients have to<BR>
connect to to mount the Lustres?<BR>
I know that it didn't work in Lustre 1.6.3 ;-) and there are no apparent<BR>
issues when connecting a Lustre client to a test cluster now (version<BR>
1.8.4), but what about production?<BR>
<BR>
<BR>
Cheers,<BR>
Thomas<BR>
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