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Servers, HDD disks and SSD parameters can be added to the tab tabs that included include known server platforms , HDDs and SSDstheir components. These lists should be extended so that they reflect all platforms and components known to the NRENs. We count on your contribution to make the tool comprehensive!

Computations related to power usage, capacity and performance are based on several parameters and assumptions, collected in the parameters tab.

The remaining tabs include the computations of contain the models and formulas for calculating the system capacity, performance, CAPEX and OPEX cost etc.

Temporarily network related costs (e.g. cost of the cluster interconnect switches, network uplinks) are not considered. This will be improved in the next versions.

The major change in the current version is vs the previous ones is distributing the calculator into several tables. Based on this organisation, partners will be able to work independently on particular aspects of the calculator, e.g. IOPS modelling or power consumption calculations.

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Hardware aspects and parameters are simulated based on the catalogue values mainly. The parameters and assumptions made adopted need to be verified by real life experience and measurements.While hardware related part is more or less covered, efforts will be put into including the storage software specifics in the simulations.

Models for simulating the power usage, MB/s and IOPS performance are relatively simplistic. We should perhaps work on improving these models based on the existing heuristics supported by real life relatonships and values collected by NRENs. Again! we need you contribution here!

Efforts will be also put into including the storage software specifics in the simulations.

It is also planned to consider traditional disk array- and tape-based systems in addition to low-cost disk server platforms. This will enable comparing the various approaches for implementing the storage services.

FEEDBACK

As the TCO is a work in progress we would appreciate ANY kind of feedback. Therefore if you like it or dislike it or have an idea of improvement or extension or you are willing to contribute to it, please contact us on the storage@terena.org mailing list.

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