Page 133 - Cloud computing: From paradigm to operation

Framework and requirements for cloud computing 1

Appendix I

Use case of data storage federation
(This appendix does not form an integral part of this Recommendation.)

I.1 Storing a user file dispersedly
Title Storing a user file dispersedly
Description In this scenario, a data storage customer having two data storages on DSF local storage requests
a large file storing from a DSF service provider. The DSF service provider splits the file into
several parts in case that DSF local storage have not enough space (Case 1) or needs to access it
in parallel for better performance (Case 2) and stores the parts into different distributed DSF
local storages.
Role/Sub-role DSF service provider (CSP:SFP)
DSF service customer (CSC:CSU)

Figure (optional) Case 1: limited capacity of data storage in DSF local storage

Case 2: CSC:CSU's parallel access requirement

Pre-conditions – CSP:SFP is available to access DSF local storage.
(optional) – CSC:CSU requests a single virtual volume to CSP:SFP.
Post-conditions
(optional)
Derived – Clause 8.1 requirement (2)
requirements – Clause 8.4 requirement (2)
– Clause 8.1 requirement (4)

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