Go to advanced search

by kangmo
Thu Feb 19, 2015 5:00 am
Forum: General discussion
Topic: Building 24 Raspberry Pi2 Cluster
Replies: 29
Views: 17403

Re: Building 24 Raspberry Pi2 Cluster

having one beefy 5V supply 25A should cover it if nothing else is plugged in [or a couple of 14A ones, or blocks of 4x 10A - up to you] would be better an more efficient than 24 small PSU's RaTTuS, thanks for the info. Actually my USB hub has two modes. A. 5V / 2.4A for 5 ports, B. 5V / 1A for 10 p...
by kangmo
Thu Feb 19, 2015 4:57 am
Forum: General discussion
Topic: Building 24 Raspberry Pi2 Cluster
Replies: 29
Views: 17403

Re: Building 24 Raspberry Pi Cluster

A cluster of Pi's does not give you a big powerful computer, it gives you a network of small computers, and its up to you to give each of them a workload. It was true for old Pi, on Pi2 you have 4 cores and each core is about 3x faster than old CPU. 24 new Raspberry Pis still will be slower than my...
by kangmo
Thu Feb 19, 2015 4:53 am
Forum: General discussion
Topic: Building 24 Raspberry Pi2 Cluster
Replies: 29
Views: 17403

Re: Building 24 Raspberry Pi2 Cluster

+1 slmaws. 24 new Raspberry Pis still will be slower than my laptop with i7 8x 2.7GHz CPU That is no doubt true from a raw compute speed perspective. There are other reasons for building a Pi cluster though. It's a good cheap way to explore clustering software, from etcd to distributed databases and...
by kangmo
Thu Feb 19, 2015 4:53 am
Forum: General discussion
Topic: Building 24 Raspberry Pi2 Cluster
Replies: 29
Views: 17403

Re: Building 24 Raspberry Pi2 Cluster

B.Goode, thanks for the great info. Actually I have seen a photo of the cluster on google image. But seeing video of the cluster was something I wanted. :-) You will probably have seen the writeup of the project at Southampton University, but here is the url for reference: http://www.southampton.ac....
by kangmo
Thu Feb 19, 2015 4:47 am
Forum: General discussion
Topic: Building 24 Raspberry Pi2 Cluster
Replies: 29
Views: 17403

Re: Building 24 Raspberry Pi2 Cluster

My brief test shows that Pi2 has 15MB/s throughput for sequential write on a micro SD card (32GB, speed:x300). Ideally, the cluster should have 15MB/s x 24 = 360MB/s write throughput. I may be able to achieve it by attaching four SD cards that supports 90MB/s to my desktop, but it means I have only ...
by kangmo
Tue Feb 17, 2015 11:00 pm
Forum: General discussion
Topic: Building 24 Raspberry Pi2 Cluster
Replies: 29
Views: 17403

Re: Building 24 Raspberry Pi Cluster

Hi Pluggy, thanks for the advice. I agree with you :-). Actually I was expecting to build a server that consumes low energy, but looks like I was too ambitious. I am going to build a columnar database that runs on N machines using Akka Cluster, which provides cluster membership, heartbeats, and so o...
by kangmo
Tue Feb 17, 2015 10:50 pm
Forum: General discussion
Topic: STICKY: Introduce yourself!
Replies: 3715
Views: 207246

Re: Introduce yourself!

I am Kangmo, a software developer in Korea. I am building a cluster with 24 Raspberry Pi2s.
The plan is to build a columnar database on top of Scala + Akka Cluster and build a search engine on top of the database.
I will open source most of my work. ;-)
by kangmo
Tue Feb 17, 2015 4:35 pm
Forum: General discussion
Topic: Building 24 Raspberry Pi2 Cluster
Replies: 29
Views: 17403

Building 24 Raspberry Pi2 Cluster

Hi, First of all, thank you Respberry Pi org, for creating such a great device. You guys simply rock. Last week, I found that I had 24 port switching hub from Cisco. http://cfile26.uf.tistory.com/image/2324484654E04CB51B5122 I started thinking what if... 24 Raspberry Pi2s are connected to the hub, a...

Go to advanced search