Today’s little gem – while attending the panel session hosted by the oracle RAC SIG and I asked the question: “what is the most surprising performance problem that you’ve had with RAC ?” – where surprising means something that wouldn’t cause you to say “I should have known that would happen” after you realise what’s happened.
Barb Lundhild, the RAC product manager, came up with a gem – a client who switched some of their discs to SSD and ran into a bug because the write times were so fast that the messages that were supposed to synchronise the writes couldn’t complete their trip around the interconnect fast enough to keep up. (The bug is now fixed.)
It’s not often that going too fast is the problem.
Footnote: it seems a little ironic that a little finger-trouble resulted in this note being posted before it was finished – another case of a problem caused by something happening too fast.