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From Alex Major <al3...@gmail.com>
Subject Re: minimum bandwidth requirement between two Geo Redundant sites of Cassandra database
Date Wed, 29 Apr 2015 10:37:14 GMT
We run between US/EU regions on AWS with more than 45ms latency without any
issues. Just use an appropriate amount of replicas in each datacenter and
make use of the appropriate consistency level (e.g local_quoram)

On Tue, Apr 28, 2015 at 2:43 PM, Daniels, Kelly <kelly.daniels@charter.com>
wrote:

> We will be anxious to confirm results in production but we have been
> seeing 30 ms or less as best; at 45 ms we start having more than tolerable
> errors, at 50 ms we start to disregard the usability.  We are also looking
> into features from Oracle DATA Guard such as ‘Apply Lag’ and ‘Transport
> Lag’ to see if we can manage internally when the transport distance is
> beyond reality.
>
>
>
> *From:* Carlos Rolo [mailto:rolo@pythian.com]
> *Sent:* Tuesday, April 28, 2015 2:07 AM
> *To:* user@cassandra.apache.org
> *Subject:* Re: minimum bandwidth requirement between two Geo Redundant
> sites of Cassandra database
>
>
>
> Hi,
>
> I would not recommend anything below 1Gbps for the bandwidth. Latency try
> to have it as low as you can.
>
>
> Regards,
>
>
>
> Carlos Juzarte Rolo
>
> Cassandra Consultant
>
>
>
> Pythian - Love your data
>
>
>
> rolo@pythian | Twitter: cjrolo | Linkedin: *linkedin.com/in/carlosjuzarterolo
> <http://linkedin.com/in/carlosjuzarterolo>*
>
> Mobile: +31 6 159 61 814 | Tel: +1 613 565 8696 x1649
>
> www.pythian.com
>
>
>
> On Tue, Apr 28, 2015 at 5:28 AM, Gaurav Bhatnagar <gauravbmit@gmail.com>
> wrote:
>
> Hi,
>
>      Is there any minimum bandwidth requirement between two Geo Redundant
> data centres?
>
> What is the minimum latency that link between two Geo Redundant data
> centres should have to get best efficient operations?
>
> Regards,
>
> Gaurav
>
>
>
>
>
> --
>
>
>

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