WG QoS-DataLC Definitions

Date & time: Tuesday 1st March - 14:30 - 16:00 - Working Meeting Session 2
Meeting title: Building an initial set of QoS metrics
The QoS DataLC group is focused on defining a common set of metrics for defining a storage service's Quality of Service (QoS) and for defining a language suitable for describing desired autonomous transitions: data lifecycle (DataLC). The initial focus is on defining QoS metrics.

QoS metrics are, in principal, any aspect of the storage service that researchers care about when interacting with it. QoS metrics definitions are intended to be device independent (they may be used to describe different storage services, based on distinct technologies), transport independent (they do not depend on how the users interact with a storage service), and time independent (they should always apply to all data stored with some given QoS).

A common set of QoS metrics will allow users to compare different services and choose the most appropriate for their use-case. It also will allow brokering services to aggregate storage to provide a synthetic or aggregated storage service with well-defined behaviour.

Data lifecycle activity are transitions that researchers can perform and that they know in advance will be needed. The trigger may be simply elapsed time, or may be something related to the data.

A common data lifecycle language will allow researchers to off-load certain responsibilities for managing their data to storage systems. Since such storage systems are often common to many research groups, this concentration of responsibility reduces the effort required to maintain data.

See QoS-DataLC for details.
The meeting will finalise the group's Case Statement, as necessary, and work towards an initial set of metric definitions.
1. Initial round of introductions (all),
2. Work on finalising Case Statement (all), as necessary,
3. Presentation of existing QoS work (named speakers),
4. Decision on which metrics to focus (all),
5. Initial set of definitions (all).
The target audience is those with experience with researchers' requirements in terms of how storage systems should behave. This includes those that are members of specific research groups (or can represent them) and those will experience of broader research collaborations. Also very welcome are people who are involved with developing and supporting storage services, and those with knowledge of storage requirements in general.

Ideally participants should join the QoS-DataLC mailing list and introduce themselves prior to attending the meeting.

Paul Millar