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From Michael Kjellman <mkjell...@barracuda.com>
Subject Re: Cassandra with SAN
Date Thu, 21 Feb 2013 23:56:12 GMT
Adding a Single Point of Failure when you chose a distributed database for probably a good
reason. I'd also think you'd be tempted to have multiple terabytes per node. (so you're even
more cost inefficient because you'll still need to buy the same number of nodes everyone else
does even though you have the SAN). Then any operations are going to be unbearable (repair,
cleanup). Also if you want to be multi dc, now you'll need two SANS.

I can't think of one good reason to run C* with a SAN.

From: Kanwar Sangha <kanwar@mavenir.com<mailto:kanwar@mavenir.com>>
Reply-To: "user@cassandra.apache.org<mailto:user@cassandra.apache.org>" <user@cassandra.apache.org<mailto:user@cassandra.apache.org>>
Date: Thursday, February 21, 2013 3:42 PM
To: "user@cassandra.apache.org<mailto:user@cassandra.apache.org>" <user@cassandra.apache.org<mailto:user@cassandra.apache.org>>
Subject: RE: Cassandra with SAN

Ok. What would be the drawbacks :)

From: Michael Kjellman [mailto:mkjellman@barracuda.com]
Sent: 21 February 2013 17:12
To: user@cassandra.apache.org<mailto:user@cassandra.apache.org>
Subject: Re: Cassandra with SAN

No, this is a really really bad idea and C* was not designed for this, in fact, it was designed
so you don't need to have a large expensive SAN.

Don't be tempted by the shiny expensive SAN. :)

If money is no object instead throw SSD's in your nodes and run 10G between racks

From: Kanwar Sangha <kanwar@mavenir.com<mailto:kanwar@mavenir.com>>
Reply-To: "user@cassandra.apache.org<mailto:user@cassandra.apache.org>" <user@cassandra.apache.org<mailto:user@cassandra.apache.org>>
Date: Thursday, February 21, 2013 2:56 PM
To: "user@cassandra.apache.org<mailto:user@cassandra.apache.org>" <user@cassandra.apache.org<mailto:user@cassandra.apache.org>>
Subject: Cassandra with SAN

Hi – Is it a good idea to use Cassandra with SAN ?  Say a SAN which provides me 8 Petabytes
of storage. Would I not be I/O bound irrespective of the no of Cassandra machines and scaling
by adding
machines won’t help ?

Thanks
Kanwar

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