VM /ETC

Posts Tagged ‘calculator’

If you are in a hurry and want to quickly get a “guesstimate” of power and cooling savings from server consolidation check out an online calculator from Platespin. The PowerRecon Power and Cooling Savings Calculator is pre-populated with commonly accepted industry values and essentially makes it very easy for you to enter the number of physical servers to match your datacenter and then hit the “calculate” button. Not only does it give you savings figures, but it provides some basic virtual host consolidation ratios for you too.

Platespin is using some big assumptions in these calculations. From the calculator’s page: Read the rest of this entry »

Too many companies try to implement replication to a DR VI without upgrading the bandwidth between the primary and secondary sites. Let’s look at a simple example that can illustrate what could go wrong with inadequate bandwidth.

A company has 5 VMs that each use 20 GB virtual disks. The data is not too dynamic and data change only averages about 1o% per business day or roughly 1 GB per hr. This data change could be common activity like Active Directory replication, files saved to user home folders, application databases, and email. This is common to a small to medium sized business.

Using the Data Replication Minimum Bandwidth Requirements chart provided by NSI, makers of Double-Take, You can see that the 100 GB falls into the LAN 10Mb/s bandwidth category (in the 10% column). Click the thumbnail image to the left for a better view of the chart. We’ve already proved that this company needs better than a T1, but it’s close enough not to convince those that think their data change will be lower than 10%.

The real “gotcha” is that companies never consider how long it will take to replicate the data. Read the rest of this entry »