I frequently use my hot-spare MDT machine for brief testing with a client.  
Usually when we have scheduled outages.  I wouldn't rely on it for a day to day 
thing, but for testing to see if everything is working properly after patches, 
outages, upgrades, etc it seems to work fine.  I've used the main once or twice 
but tend to cross my fingers the entire time. 

This has worked since about ~1.[6|7]?  Definitely in 1.8  Still working today 
on the 2.5.x main.

Ed Wahl
OSC

________________________________________
From: lustre-discuss [[email protected]] on behalf of Ben 
Evans [[email protected]]
Sent: Thursday, May 21, 2015 9:43 AM
To: Lukas Hejtmanek; [email protected]
Subject: Re: [lustre-discuss] Coexistence of Luster client and server on        
a       single machine

I believe it is OK for some simple functional testing, but not production, or 
working with large datasets.

OSTs and MDTs can coexist, and I believe OSTs and Clients can coexist 
relatively peacefully, but MDTs and Clients are a bad mix.

-Ben Evans

-----Original Message-----
From: lustre-discuss [mailto:[email protected]] On Behalf 
Of Lukas Hejtmanek
Sent: Thursday, May 21, 2015 7:34 AM
To: [email protected]
Subject: [lustre-discuss] Coexistence of Luster client and server on a single 
machine

Hello,

some time ago I asked whether it is possible to run lustre server (OSD) and 
client (mount -t lustre) on the same machine. Somewhere close to Lustre 1.3.x, 
the answer was not, such setup is not recommended due to VM pressure from 
client and server.

Is there anything new with current mainline Lustre version? So, can I mount my 
lustre fs on the same server that is used as OSD or MTS without harm?

--
Lukáš Hejtmánek
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