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Datum: Thu, 18 Feb 2010 13:51:33 -0600 Von: Eric Rostetter <rostetter@mail.utexas.edu> An: dovecot@dovecot.org Betreff: Re: [Dovecot] GlusterFs - Any new progress reports?
Quoting Steve <steeeeeveee@gmx.net>:
My interest is more in bootstrapping a more highly available system from lower quality (commodity) components than very high end use
GFS+DRBD should fit the bill... You need several nics and cables, but they are dirt cheap... Just 2 machines with the same disk setup, and a handful of nics and cables, and you are off and running...
Can you easy scale that GFS2+DRBD to have more then just 2 nodes? Is
Not really, no. You can have those two nodes distribute it out via gnbd though... Red Hat claims it scales well, but I've not yet tested it...
I have already installed GFS on a cluster in the past, but never on DRBD.
Can all the nodes at the same time be active or is one node always the master
and the other a hot spare that kicks in when the master is down?The free version of DRBD only supports max 2 nodes. They can be active-active or active-passive.
The non-free version is supposed to support 3 nodes, but I've heard
conflicting reports on what the 3rd node can do... You'd have to investigate that yourself... I'm not interested in it, since I don't want to pay for it... (Though I am willing to donate to the project)
Hmm... when I started with GlusterFS I thought that using more then two nodes is something that I will never need. But now that I have GlusterFS up and running and I am using more then two nodes I really see a benefit in being able to use more then two nodes. For me this is a big advantage of GlusterFS compared to DRBD.
My proposed solution to the more-than-two-nodes is gnbd...
Never heard of it before. Don't like the fact that I need to patch the Kernel in order to get it working.
If that doesn't meet your needs, then DRBD probably isn't the proper choice. You didn't mention anything about number of nodes in your original post, IIRC.
I did not post the original post. I just responded to the original post saying that GlusterFS works for me.
Thanks
Ed W
-- Eric Rostetter The Department of Physics The University of Texas at Austin
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