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Old 03-26-2015, 10:06 PM   #1
markgrinceri
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Multiple Apache Servers - Shared Storage


Hi All,
Hopefully a simple question to answer. I am going to be setting up multiple Apache web servers behind a F5 load balancer and need to share the documentRoot out to all the servers. I have a dedicated SAN which I want to use and I've been searching to find a concrete document that states if its ok to use an iscsi drive or NFS mounted to all web servers but haven't seen anything concrete to say thats the normal or best practice way to setup that environment. My main concern is writing to the file at the same etc.

Can someone advise what they do for multiple web servers?

Thanks
 
Old 03-27-2015, 02:35 AM   #2
ttk
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An NFS mount will work, but a GlusterFS volume would work better. If you put a Gluster "brick" on each webserver, and turn them into a mirrored volume, then read access will be fast because each webserver will have a local copy of the content, but modification to the content will be replicated to them all.

http://www.gluster.org/
 
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Old 03-28-2015, 08:13 AM   #3
Hangdog42
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If you go the Gluster route, be sure to do extensive testing before committing to production. I've been on some projects recently where Gluster broke, and broke badly, under heavy loads. These were bioinformatics projects dealing with ~3 PB of data, but a couple of sites had to go back and replace Gluster because it was completely freezing.
 
Old 03-29-2015, 01:17 PM   #4
jpollard
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Quote:
Originally Posted by Hangdog42 View Post
If you go the Gluster route, be sure to do extensive testing before committing to production. I've been on some projects recently where Gluster broke, and broke badly, under heavy loads. These were bioinformatics projects dealing with ~3 PB of data, but a couple of sites had to go back and replace Gluster because it was completely freezing.
Any idea of how old that installation was? There were some early issues, but none that I've heard of recently (not in the last couple of years).
 
Old 03-29-2015, 02:36 PM   #5
Hangdog42
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Quote:
Originally Posted by jpollard View Post
Any idea of how old that installation was? There were some early issues, but none that I've heard of recently (not in the last couple of years).

It was pretty recent, within the last 6 months. Unfortunately I wasn't on the team having problems, so I don't know what versions of software they were using. I've been assuming it was up to date since the rest of the sites are using but you never know.
 
Old 03-29-2015, 03:33 PM   #6
ttk
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A long burn-in with intensive testing is always a good idea before incorporating new technology into production systems.
 
  


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