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Quantitative Finance · शब्दावली

On-demand, reserved and spot capacity क्या है?

अन्य नाम: on-demand capacity · reserved capacity · spot capacity

Definition 26.2 Research, Data and Risk Platforms · अध्याय 26 — Cloud Against On-Premises

On-demand capacity is rented by the second or hour with no commitment, at the provider’s list price. Reserved capacity is committed for one or three years at a lower hourly price, paid whether used or not. Spot capacity is the provider’s unused capacity rented at a lower, changing price, which the provider can reclaim at short notice, interrupting whatever runs on it.

Cost per thread-hour actually used against the utilisation of the capacity paid for, at the cited prices and the model’s owned server. Owned capacity is cheaper than on-demand above 9% utilisation and cheaper than spot above 22%; three-year reserved capacity beats on-demand above 44% but never beats owning. Data: fig_cloudcost.py.
Figure 26.1. Cost per thread-hour actually used against the utilisation of the capacity paid for, at the cited prices and the model’s owned server. Owned capacity is cheaper than on-demand above 9% utilisation and cheaper than spot above 22%; three-year reserved capacity beats on-demand above 44% but never beats owning. Data: fig_cloudcost.py.
server priceper monthcents per thread-hourbreak-even: on demandspot
as assumed ($43 724)$1 5080.409.0%22.3%
twice$2 4190.6514.5%35.8%
three times$3 3300.8920.0%49.2%
Table 26.1. The utilisation above which the owned server costs less than renting the same threads, for three server prices. Even at three times the assumed price, owning wins for any capacity used more than a fifth of the time against on-demand, and half the time against spot.
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