http://www.dolphinics.com/ make this cool SCI socket hardware that can be used with MySQL Cluster (for example, like their example setup).

Their tech provides high performance (350MB/sec avail to the user) and low latency (worst case is like 2 or 3 micro seconds to send 512bytes to another node). So can pretty much kick the butt of gig-e.

We could probably do some really cool stuff with boosting performance (even further) when using SCI with some of the things I have in mind for multithreaded ndb kernel – basically changing some of the ways we do sending and receiving signals and improvements in shared memory stuff.

Big points from the presentation are:

• small messages sent using basic CPU instructions (it’s remote memory mapping)
• low cost to write to remote memory address
• raw worst case send latency for 8 bytes is about 210 nanoseconds
• no need to lock down or register memory
• TCP/IP processing not done in software
• Just LD_PRELOAD the library and it does your (user specified) Ip communication over the SCI interconnect
• can be fully redundant (dual cards, distributed switching)
• each card is about 5w of power (rather insignificant compared to other techs apparrently)
• really small time for failover

It’s also good to note that 10 gigabit ethernet doesn’t really buy you anything in reducing latency. SCI gives you both improved bandwidth and latency.

People looking into wanting more performance in MySQL Cluster should have a good look at it.

It’s also used in fighter planes – which make cool loud jet noises.

(err… i didn’t mean to sound to rah rah. hopefully i’ve just sounded like i think the tech is shiny)

UPDATE: corrected milli to nano.

UPDATE mk2: corrected nano to micro. Oh how I wish I just typed correctly to begin with. At least I’ve had some rest now :)

Mike Hillyer’s Personal Web Space » Blog Archive » It’s Alive!!

Mike’s laptop went funny, but he had a backup of his presentation.

So, something about my backup strategy.

I have a policy that anything that I really care about is backed up. If it’s not backed up, I don’t care about it.

e.g. while I’d be sad if my mythtv box suddenly had a disk failure, I can always put in a blank disk and I don’t loose too much.

My email is fetched onto a server at home, and I use offlineimap to keep an up to date (nearly) copy on my laptop. I also, at least weekly, burn the entire thing to DVD (it still fits, when bzip2 compressed).

Also, for all that other stuff that is pretty important (/home), I do a xfsdump to external disk.

I also now (on a paranoid spending trip at Fry’s) have a small portable drive that is roughly twice the size of my /home partition. The idea is that on the road I can regularly do an xfsdump to this  – in fact, two complete dumps (and one or two incrementals on it).

Call me paranoid, but I like my data.

I also make sure I burn photos to DVD, but that’s more periodic as there’s a lot of them now.