GSC Sentinel-2 PDGS SRD - emits - ESA

GSC Sentinel-2 PDGS SRD
Issue 1 Revision 2 (draft) - 25.07.2010
GMES-GSEG-EOPG-RD-09-0028
page 64 of 204
S2-PDGS-SYS-825
The PDGS shall be scalable in supporting an increasing number of simultaneous data
access requests and to further improve the dissemination performance. Scalability shall
be ensured through HW upgrade and/or reconfiguration only without SW changes.
S2-PDGS-SYS-830
The PDGS shall be fully scalable with hardware to cope with increase of sizing
requirements, particularly in terms reprocessing, archiving, circulation and dissemination.
S2-PDGS-SYS-835
The PDGS design shall make use of off-the-shelf hardware designs allowing the swift
replacement of the hardware parts demonstrating repeated or permanent failures (e.g.
Blade technology hardware, Disk arrays, etc).
S2-PDGS-SYS-840
The PDGS design and operations principles shall ensure the minimization of the
operational costs while ensuring the mission required performances.
S2-PDGS-SYS-845
The PDGS software development process shall, whenever justified, make use of off-theshelf,
commercial or public domain, field proven, software components or software
applications. Justifications shall result from a cost trade-off analysis considering the
coverage of the software reuse solution with regards to the functional, performance,
quality and maintainability requirements to be fulfilled.
S2-PDGS-SYS-850
The PDGS software elements shall be designed for long-term maintainability over a period
spanning 20 years of the PDGS operational lifetime. In this context, maintainability
includes the preventive, corrective, adaptive, and perfective (improving) maintenance
types, and applies to all software elements composing the PDGS including reused
software (e.g. off-the-shelf software, commercial or public domain).
S2-PDGS-SYS-855
The PDGS computer platforms shall be based on Intel based architecture and use
compatible and well maintained Linux operating system distributions.
S2-PDGS-SYS-860
The PDGS shall be designed to cope with multiple Sentinel-2 mission satellites, initially
configured to operate with Sentinel-2A and capable to be configured in the future to
operate with Sentinel-2A and Sentinel-2B.
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