It looks like the Syntegrity blog has refactored their URLs. A quick search on their blogs reveals the new locations to be as follows:-
Dealing with RDQM Cluster Loss – Part 1 – Recovery
Dealing with RDQM Cluster Loss – Part 2 – Restoration
Beware that the links within the blog post text itself where Part 2 refers to Part 1 are still incorrect. @Neil Casey - if you have the chance, perhaps you would be able to correct those?