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From Eric Fleischman <e...@ericfleischman.com>
Subject RE: EC2 disk configuration for zookeeper? One big disk or two smaller ones per node?
Date Tue, 09 Oct 2012 15:47:14 GMT
I'd also add that EC2 supports a variety of different ways of configuring the disks which should
be explored if you are very write heavy. They include:
* Using high IOPS instances
* Using multiple disks and doing OS level RAID across them to present a single logical disk
to the app
* Local vs. EBS volumes
* Standard vs. provisioned IOPS w/EBS

I'd be interested to know if others have already done benchmarking of these different configurations.
I've never heard about it if so (but I’m pretty new to ZK so that doesn't mean much :)).

~Eric

-----Original Message-----
From: Ted Dunning [mailto:ted.dunning@gmail.com] 
Sent: Tuesday, October 09, 2012 8:29 AM
To: user@zookeeper.apache.org
Subject: Re: EC2 disk configuration for zookeeper? One big disk or two smaller ones per node?

Two disks could be a significant advantage.

You should also experiment with ways to avoid VM induced gaps in time.

Finally, if you really are going to be write heavy, 3 nodes are likely to perform better than
5.

On Tue, Oct 9, 2012 at 2:03 PM, Brian Tarbox <briantarbox@gmail.com> wrote:

> In setting up an Amazon EC2 configuration for a group of zookeeper 
> nodes I'm wondering about disk configurations.  The zk documentation 
> stresses the advantages of a dedicated disk for the transaction log.  
> Does this imply that two smaller disks would be more performant than a single larger
disk?
>  I'm anticipating a 5 node write-heavy cluster.
>
> Thanks.
>
> --
> http://about.me/BrianTarbox
>
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