AIMS AND SCOPE
NRENs and other academic organisations are currently using, building or planning to build the low-cost storage infrastructure. Aim of this work is to help the system designers in understanding the real costs of the storage systems.
TCO calculator enables analysing the storage infrastructure costs including the hardware investments costs as well as operational costs such as energy, maintenance and data center related costs. It also calculates and simulates overal system parameters such as system throughput, IOPS etc.
At the moment TCO calcuator cosinders the low-cost storage systems based on disk servers. It takes into account costs and parameters resulting from the server platform used, HDD and SSD drives applied as well as software defined storage software specifics (mainly Ceph).
The version attached to this web page is a result of the discussion among NRENs that started during the TF-Storage meeting in Vienna. Teleconference notes are (or will be) included in the child pages.
HOW TO USE THE TCO CALCULATOR.
TCO calculator is provided as the excel sheet to be used offline.At some point we will perhaps prepare an online tool.
You can get it from here: TCO_calculator
You may specify the basic system parameters on the single sever landing page. They include sever platform, type of the HDD and SSD disks used as well as the data redundancy level and access pattern planned in the system.
You may also analyse multi server configuratons using a dedicated tab.
Servers, HDD disks and SSD parameters can be added to the tab that included known server platforms, HDDs and SSDs. These lists should be extended so that they reflect all platforms and components known to the NRENs.
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 the system capacity, performance, CAPEX and OPEX cost etc.
Temporarily network related costs are not considered. This will be improved in the next versions.
The major change in the current version 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.
PLANS and ROADMAP
Hardware aspects and parameters are simulated based on the catalogue values mainly. The parameters and assumptions made 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.
It is also planned to consider traditional disk array- and tape-based systems in addition to low-cost disk server platforms.