Re: minimum bandwidth requirement between two Geo Redundant sites of Cassandra database
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.dani...@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:r...@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 gauravb...@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 --
RE: minimum bandwidth requirement between two Geo Redundant sites of Cassandra database
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:r...@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/carlosjuzarterolohttp://linkedin.com/in/carlosjuzarterolo Mobile: +31 6 159 61 814 | Tel: +1 613 565 8696 x1649 www.pythian.comhttp://www.pythian.com/ On Tue, Apr 28, 2015 at 5:28 AM, Gaurav Bhatnagar gauravb...@gmail.commailto:gauravb...@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 --
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 gauravb...@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 -- --
minimum bandwidth requirement between two Geo Redundant sites of Cassandra database
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
