24/7 Uptime’s server high availability partner, Marathon Technologies, presented a live webinar on 24 June.  Some questions and answers arose during the live broadcast that concentrated on protecting a SQL environment using Marathon’s everRun fault tolerant high availability software and these are detailed below.  Contact us on [email protected] if you would like to view the full webinar and/or be included on our mailing list so we can tell you about the next one.

Q: Does everRun work with SQL 2008?
Yes. everRun supports any Windows application without requiring changes or customisation. Because everRun resides below the operating environment, we are protected underneath that.

Q: Does everRun work with Exchange 2007 as well?
 Yes it does. everRun supports any Windows application without requiring changes or customisation.

Q: Does everRun work with iSCSI?
 We have an agnostic approach to storage as well. Pretty much any type of storage will work. iSCSI, fibre, direct attached, etc.

Q: What is the performance impact of using everRun with SQL?
There are variance rates depending on the servers and applications that you are using, but the impact has in general been shown to be very small.

Q: Does everRun work with the free XenServer?
Yes, everRun VM for XenServer supports the free version of XenServer as well as Essentials for XenServer Enterprise and Platinum Editions.

Q: How does everRun handle the mirroring of data that’s loaded in the memory?
With our level 3 fault tolerance, we actually mirror the memory and CPU between the two systems, so they are running in lockstep. This provides a 100% uptime solution. Our everRun software makes sure that the memory and CPU state are mirrored and completely synchronized between the two servers at all times.

Q: Does everRun require a SAN?
A: No it doesn’t require a SAN.  We can also mirror storage between two different systems, if that’s what you choose to do. A lot of everRun users do that, either locally or separated geographically. We can support a SAN in multiple ways. We can support a SAN where you have a single copy of the data. And both servers will connect to the single copy of the data. We also support a SAN where one of the servers is connected to that SAN and the other server has its own storage and we can mirror between that. A lot of our customers are using that option to provide data protection and fault tolerance at the data level. We can use different types of storage on either side.

Marathon Technologies Q&A: SQL availability, database and app protection