Cloud SLA Metrics Based on the SLALOM Specification and Reference Model v1

Cloud SLA Metrics Based on the SLALOM Specification and Reference Model v1

This document provides specific proposals for cloud SLA metrics based on the SLALOM specification and reference model [1]. A similar approach has been followed for developing the SLALOM Legal Model [3], which gives specific proposals intended to be directly usable by cloud Adopters and cloud Providers. This document is intended to be more immediately usable especially by Adopters than the generic SLALOM technical model. SLALOM is aligned with ISO standards on cloud SLAs and the SLALOM model is making use of the draft ISO 19086-2 standard fields. Hence, a SLALOM-compliant SLO is ISO-compliant, but additionally it is clear, well defined and non-repudiable, i.e. its measurement cannot be contested.

For each metric, the document is structured as follows:

  • General description of the metric
  • Standard metric provisions used in the market
  • Provider’s perspective
  • Adopter’s perspective
  • Position proposed by SLALOM
  • SLALOM proposed metric parameters Indicative SLO definition for the metric, based on the SLALOM reference model, where available

Parameters are discussed using the following categories:

  • Measurement. This corresponds to the ‘Sample (Measurement)’ layer in the reference model [1], also described in the text as the ‘sample definition’.
  • Qualification. This corresponds to the ‘Period (Time)’ layer in the reference model [1], also described in the text as the ‘boundary period and error definition’.
  • Result. This corresponds to the ‘Metric (Ratio)’ layer in the reference model [1], also described in the text as the ‘abstract metric definition’.
Date: 
Thursday, June 16, 2016