Re: CF 8 Instance Clustering: for performance? or failover?
With multi-server CF8 you can duplicate an instance and then link them together as a cluster on the same machine. Does this improve performance in any way? Or is it purely for failover should 1 of the instances halt in any way? And with the failover circumstance, how are you notified if one of the instances in your cluster is failing? Just figured I'd post some results, as I have been playing with CF8 clustering in our development environment. I must say that I am extremely pleased so far with CF8's ability to failover from a dead instance seamlessly while keeping the user's session active. Single server, multi-instance clustering seems to work very well. I also set up a cluster that spanned physical servers, but without as much luck. I could get failover across servers, but the user was always logged out. And the situation where you might completely lose a single server has a lot to do how your load balancer is set up. In our situation, clustering across physical servers won't really help us because our networking staff has our load balancer permanently directing blocks of users to one server or the other. But I am going to recommend that we create multiple-instances of our high level clients and run them as single server clusters. With CF7 we have had quite a few situations where a CF (Jrun) server has simply stopped responding and killed a site. Cheers ~| Adobe® ColdFusion® 8 software 8 is the most important and dramatic release to date Get the Free Trial http://ad.doubleclick.net/clk;160198600;22374440;w Archive: http://www.houseoffusion.com/groups/CF-Talk/message.cfm/messageid:301681 Subscription: http://www.houseoffusion.com/groups/CF-Talk/subscribe.cfm Unsubscribe: http://www.houseoffusion.com/cf_lists/unsubscribe.cfm?user=89.70.4
CF 8 Instance Clustering: for performance? or failover?
With multi-server CF8 you can duplicate an instance and then link them together as a cluster on the same machine. Does this improve performance in any way? Or is it purely for failover should 1 of the instances halt in any way? And with the failover circumstance, how are you notified if one of the instances in your cluster is failing? Thanks for any help! Steve ~| Adobe® ColdFusion® 8 software 8 is the most important and dramatic release to date Get the Free Trial http://ad.doubleclick.net/clk;160198600;22374440;w Archive: http://www.houseoffusion.com/groups/CF-Talk/message.cfm/messageid:301442 Subscription: http://www.houseoffusion.com/groups/CF-Talk/subscribe.cfm Unsubscribe: http://www.houseoffusion.com/cf_lists/unsubscribe.cfm?user=89.70.4
Please Review CF Cluster Diagram
We are inexperienced with ColdFusion clustering, but believe that it would server us well if we started implementing it with our upgrade to CF8. We currently run multi-instance CF7 across 2 production servers... but without clustering. In essence, the servers are mirrors and essentially live backups of each other. They don't really share the load or provide true automatic fail over. Can you take a look at the following diagram to see if we are on the right track here? This is our first stab at how CF instance clustering might work in our environment. http://ooine.com/image/generic_cluster_plan_01.gif Thanks very much! Steve ~| Adobe® ColdFusion® 8 software 8 is the most important and dramatic release to date Get the Free Trial http://ad.doubleclick.net/clk;160198600;22374440;w Archive: http://www.houseoffusion.com/groups/CF-Talk/message.cfm/messageid:30 Subscription: http://www.houseoffusion.com/groups/CF-Talk/subscribe.cfm Unsubscribe: http://www.houseoffusion.com/cf_lists/unsubscribe.cfm?user=11502.10531.4
Is the need for multiple CF instances diminishing?
Our business is sort of an ASP model where we have a single, main application to which we essentially sell subscriptions to large clients. Over the years, those clients have demanded unique changes to the app that have caused the main code base to split into separate versions. Currently we run CF multi-server on JRun, so we have an instance for each of our clients. For some reason, we've always found this desirable, though we've never really seen any clear benefits other than being able to maintain separate CFAdmin settings and restart an instance without affecting all of our clients. We now wish to consolidate our code into a single app that pulls in custom styles, pages, features, content as necessary. One way to make this happen is to have a single application (code base) running on a single CF instance that pulls in custom materials from client directories where necessary. I having a feeling that moving from multi-instance to single-instance is going to be a hard sell. I have been picking up tidbits of information about CF8 that lead me to wonder if multi-instance CF is something on the wane anyway. Can anyone shed some light? I have more questions, but I will leave it at this for now. Any comments? ~| Adobe® ColdFusion® 8 software 8 is the most important and dramatic release to date Get the Free Trial http://ad.doubleclick.net/clk;160198600;22374440;w Archive: http://www.houseoffusion.com/groups/CF-Talk/message.cfm/messageid:298346 Subscription: http://www.houseoffusion.com/groups/CF-Talk/subscribe.cfm Unsubscribe: http://www.houseoffusion.com/cf_lists/unsubscribe.cfm?user=11502.10531.4
Re: Is the need for multiple CF instances diminishing?
Whoa What about the ability to run your instances with different JVM args and allocate memory and resources specifically? And what about leveraging more than 1.6 gigs of memory using multi-instances? It seems to me there are resource issues that multi instance addresses as well. Okay, this is the sort of thing I was looking for... and the obvious gap in my knowledge. Have you got any links I can be referred to for discussion on JVM tweaking for performance? We *do* have clients with significantly imbalanced usership, so it would be nice to scale back one in order to boost the other. Thanks for the help so far. ~| Adobe® ColdFusion® 8 software 8 is the most important and dramatic release to date Get the Free Trial http://ad.doubleclick.net/clk;160198600;22374440;w Archive: http://www.houseoffusion.com/groups/CF-Talk/message.cfm/messageid:298384 Subscription: http://www.houseoffusion.com/groups/CF-Talk/subscribe.cfm Unsubscribe: http://www.houseoffusion.com/cf_lists/unsubscribe.cfm?user=11502.10531.4
