Just like the title says, using Microsoft SQL Server's database mirroring capability, can the mirroring occur between two clusters? All of the examples in MSDN show a topology indicating single servers for both the principal and mirror server. ...
At the startup I'm working at we are now considering scaling solutions for our database. Things get somewhat confusing (for me at least) with MySQL, which has the MySQL cluster, replication and MySQL cluster replication (from ver. 5.1.6), which is an asynchronous version of the MySQL cluster. The MySQL manual explains some of the differe...
Session variables are normally keept in the web server RAM memory. In a cluster, each request made by a client can be handled by a different cluster node. right?! So, in this case... What happens with session variables? Aren't they stored in the nodes RAM memory? How the other nodes will handled my request correctly if it doesn't ...
StateServer or SQLServer? What is the best solution for storing ASP.NET session variables? What are the pros and cons of each? Are one better then other in any particular situation? ...
I've been reading up on this subject for a while. Suddenly the day has come where this solution is a necessity, not just a dream. Through my reading, I've seen the popular differences being (file based, memcached, shared memory (mm), sql table, and custom). The idea we originally thought of was using a ZFS or AFS mounted on each of the...
I was shocked to learn that OpenMosix is closed. Can you suggest any similar free tool for linux. For those who don't know, OpenMosix is a software package that turns networked computers running GNU/Linux into a cluster. It automatically balances the load between different nodes of the cluster, and nodes can join or leave the runni...
Does anybody have experience using the open source offering from Terracotta as opposed to their enterprise offering? Specifically, I'm interested if it is worth the effort to use terracotta without the enterprise tools to manage your cluster? Over-simplified usage summary: we're a small startup with limited budget that needs to process ...
Windows NLB works great and removes computer from the cluster when the computer is dead. But what happens if the application dies but the server still works fine? How have you solved this issue? Thanks ...
I'm working with a database schema that is running into scalability issues. One of the tables in the schema has grown to around 10 million rows, and I am exploring sharding and partitioning options to allow this schema to scale to much larger datasets (say, 1 billion to 100 billion rows). Our application must also be deployable onto se...
P1 and P2 are processes or nodes in a cluster. f1 and f2 are their flags. Supposing strong memory model, and that both processes may be restarted at any moment, and that restarting a process clears it's flag, here's an algorithm that I came up with and couldn't yet break, but that bothers me for it's not theoretically proven and looks t...
I have clustered applications that requires one of the nodes to be designated as the master. The cluster nodes are tracked in a table with nodeID, isMaster, lastTimestamp columns. Each node in the cluster will try to become a master every X seconds. Node can only become a master if either there is no other master nodes the lastTimest...
Hi folks, I'm trying to see if anyone knows how to cluster some Lat/Long results, using a database, to reduce the number of results sent over the wire to the application. There are a number of resources about how to cluster, either on the client side OR in the server (application) side .. but not in the database side :( This is a simi...
Greetings, I am developing a scientific application used to perform physical simulations. The algorithms used are O(n3), so for a large set of data it takes a very long time to process. The application runs a simulation in around 17 minutes, and I have to run around 25,000 simulations. That is around one year of processing time. The...
Hello First of all, sorry for my poor english. I would try to explain my problem. I am using psexec within a script to restart a cluster as follows: script1 in node1: perform a lot of tasks (shutdown services, check status, etc..) in the node1 and after completing all task launch with psexec the script2 in node2 (psexec-d \ \ node2...
I'm writting a paper about clusters, so... What books or articles have a good theoretical material about clusters? For the ones that may show interest in this paper, it is related to a project I'm working on called L2LB, online @ http://l2lb.googlecode.com/ ...
Hi all, We have a number of web servers, each running one version of Coldfusion. The cluster has a load balancer on front of it. Obviously each of these servers has it's own CF application running and this implements query caching at the CF application level. However, since all of these servers service the one web application, many o...
This is the ability to run your application on a cluster of servers with the intent to distribute the load and also provide additional redundancy. I've seen a presentation for GridGain and I was very impressed with it. Know of any others? ...
I want to develop a multi-server clustered framework that will work similarly to the steps below for message flow. From Client Gateway Server Recieves Message Gateway Server sends an ACK Message (UDP) Message is custom deserialized from binary into an object via a factory Message is then routed to a secondary server in the cluster (co...
Hei, I am tring to update a rocks cluster from 5.0 to 5.1. and i can't make the restore iso file. In the cd /export/site-roll/rocks/src/roll/restore directory I am missing the Rolls.mk file. Tried to copy the file and the other it complained about from an other place but that did not work. Does anyone know how to fix this? ...
Does .Net have any open source clustering products like terracotta (http://www.terracotta.org/)? Thanks ...