Frequently Asked Questions
What is the difference between the 'Disaster Recovery' and 'Full' versions of Zeus Global Load Balancer?
Zeus Global Load Balancer provides two capabilities:
- Business Continuity enables failover from one datacenter to another in the event of datacenter failure, so that the service is available despite the datacenter failure
- Improving Customer Experience is achieved by load-balancing users across multiple datacenters simultaneously, depending on datacenter performance and geographic proximity.
The 'Disaster Recovery' version of Zeus Global Load Balancer only provides the business continuity capability. It directs all users of a service to the same datacenter unless that datacenter fails.
The 'Full' version of the solution also load-balances users across multiple active datacenters to give them the best possible level of service by minimising the transaction latency.
How many Zeus Global Load Balancer devices are required?
There must be at least one device located in each datacenter that is hosting a service. The device monitors the health and performance of the services in the local datacenter, and exchanges this information with the Zeus Global Load Balancer devices in other datacenters. This way, every device has an accurate impression of the availability and performance of every datacenter.
A single Zeus Global Load Balancer in a datacenter creates a single point of failure for that datacenter. If the device were to fail (because of a hardware fault for example), then the datacenter would not broadcast health information and the other devices would consider it as failed. It is common to run a pair of Zeus Global Load Balancer devices in each datacenter to elinimate this single point of failure.
How accurate is the GeoIP information that Zeus Global Load Balancer uses?
Zeus Global Load Balancer uses a database of IP address to geographic location when performing geographic load balancing and on the global map visualization. This database is 100% accurate per country, and over 60% accurate per city within a country. Users can manually extend the database, giving specific geographic locations to IP blocks if required.
What are the different delivery platforms for Zeus Global Load Balancer?
The Zeus solution is available as software for a range of operating systems and server types:
Platform Fully Supported OS version Linux x86 2.6.8+ Linux x86-64 2.6.8+ Solaris SPARC 8, 9, 10 Solaris x86 10 Solaris x86-64 10
How many DNS requests can Zeus Global Load Balancer process?
A modern two-core or dual processor x86 system can manage and rewrite over 40,000 DNS requests per second.
When devices are deployed in a cluster, DNS traffic is shared between then using round-robin DNS. So, a cluster of 4 Zeus Global Load Balancer devices could handle over 100,000 DNS requests per second.
Zeus Global Load Balancer can modify the TTL field in DNS responses, giving you control over how frequently clients re-request DNS data.
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