Multi-processor Multi-processorWhy would I need this?
If you are running a highly-parallelisable workload, such as a very processor intensive database application, it is possible that your software can take advantage of multiple processors to increase its performance. In those cases where it would be beneficial, typically upgrading to 2 virtual CPUs is sufficient, though in some cases, albeit uncommonly, very parallel applications may even benefit from an upgrade to 4 virtual CPUs.
Additional memoryWhy would I need this?
The operating system, running applications, and the working data set being used by those applications will all require memory. If the available memory is exhausted, as often happens if a server has more users than was planned for, then the operating system will move the least frequently used portions of memory out to disk to make space. Such activity may result in serious performance penalties, so should be avoided. Ensure you specify sufficient memory for your intended workload.
Additional disk spaceWhy would I need this?
All files stored within your server, including the programs and libraries of the operating system and installed applications, as well as any databases, web sites, mail messages, media files, logs, and so forth, will all consume disk space. If disk space is exhausted, proper operation of running applications will likely not occur, so it is important to plan for sufficient space initially and to allow some growth.
Multiple site mirroring and failoverWhy would I need this?
Even with the levels of resilience present in the facilities, networking, server and storage that make up the service at each site, matters beyond our reasonable control, such as extreme weather events or catastrophic civil engineering failures, could possibly result in the disablement or loss of access to an entire site. Because of this, for your critical servers, we offer the capability to mirror at another site. Your server's virtual hard disk is replicated from its live site to a standby site, from which the server can then be restarted quickly if the live site is rendered offline.
How does it work?
During normal operation, your virtual server is running on one of the physical servers, and has its hard disk drive kept on the resilient storage array, at a designated primary datacentre. If you take the mirroring add-on, your server’s virtual hard drive is replicated from the storage array at the designated primary datacentre to another storage array at a designated standby datacentre. At any time, should an outage occur at the primary datacentre, a physical server at the standby datacentre can be attached to the replicated copy of your server’s hard disk drive, and your server can be immediately restarted. Because of the portability of addressing within our network, after the restart, traffic in and out of your server will continue to be routed correctly.
Additional network data allowanceWhy would I need this?
The services you're offering will transfer data over the Internet to and from the clients accessing it. This may be in the form of a web site, whose textual and graphical content are sent to each visitor, or perhaps email, with the messages that are sent and received being transferred in each direction, for example. All this activity comes out of your package's monthly allowance, and if the number of users or amount of data transferred per user means you need to exceed this, an additional allowance will be required.
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