3 ms·

I think there is a bit of misunderstanding of what Tandem really is. It looks like it relies on communications between processors to never fail and be fast, whi

by zzzcpan 10y ago

I think there is a bit of misunderstanding of what Tandem really is. It looks like it relies on communications between processors to never fail and be fast, which makes a lot of things easier, but at the same time this also doesn't make it into what we consider a distributed system. It's more like a single big computer, that can fail. Btw, Erlang OTP shares many ideas with Tandem. And Joe Armstrong actually discussed them in his thesis [1] and talks and articles [2]. [1] http://erlang.org/download/armstrong_thesis_2003.pdf http://erlang.org/download/armstrong_thesis_2003.pdf [2] http://cacm.acm.org/magazines/2010/9/98014-erlang/fulltext http://cacm.acm.org/magazines/2010/9/98014-erlang/fulltext

Animats 10y ago
The original Tandem systems involved all processors on a redundant local bus. The system was later extended to allow processors to be networked remotely. The two machines acting as primary and backup for a transaction no longer needed to be in the same room. They did require a low-latency connection, though. This was all pre-Internet, so Tandem had their own protocols. [1] http://www.hpl.hp.com/techreports/tandem/TR-86.2.pdf http://www.hpl.hp.com/techreports/tandem/TR-86.2.pdf