Gluster in a web cluster

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Mathieu - 
Gluster will work well for you, I would suggest you start testing with the Gluster NFS option in Gluster 3.1, it sounds like you could use some of the advantages that NFS client side caching gets you. 

http://www.gluster.com/community/documentation/index.php/Main_Page 



Thanks, 

Craig 

-- 
Craig Carl 
Senior Systems Engineer 
Gluster 



From: "Mathieu Masseboeuf - Cadran Finance" <mm at tradingsat.com> 
To: gluster-users at gluster.org 
Sent: Wednesday, October 20, 2010 4:38:35 AM 
Subject: Gluster in a web cluster 

Hi, 


I'm trying to figure out a solution for a web cluster, where part of the 
sources will be fixed (those can be handled by a rsync from the dev 
environment) - and the rest will be user sent datas (pictures and so on). 
I wanted to avoid the NAS solution for various reasons (price, nfs 
locking, redundancy) and ended getting to know gluster. 
The RAID1 setup seems perfect for my case, but I have some questions : 
* Reading a file on the raid "array" makes gluster check if there is a 
update on other servers - is there a way to optimise this ? (cache for x 
seconds for example) 
This seems the goal of performance/io-cache - am I correct ? 
* I don't mind to miss a file for under a second, hence is it possible 
to get gluster to send "new/updated files" messages to his brothers - 
instead of having the children check for the new file each time ? 
* Quick-read seems a nice idea if the partition hosts small files (won't 
be used here, as I'll be hosting images) 

Will I manage to get nice performances with this setup ? (I plan to have 
a cache in front, I want to know about raw performances) 
Will those performance degrade a lot when I add more nodes (for now, 
I'll only have 2) ? 
Is putting my whole document root on the raid1 a good idea ? (this will 
depend on the refresh issue I suppose) 


Thanks in advance, 
Mathieu 
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