Comments on: WebSphere Concepts: Cell, Node, Cluster, Server… http://itdevworld.wordpress.com/2009/05/03/websphere-concepts-cell-node-cluster-server/ IT Related thoughts Fri, 11 Dec 2009 23:13:54 +0000 http://wordpress.com/ hourly 1 By: rafaelri http://itdevworld.wordpress.com/2009/05/03/websphere-concepts-cell-node-cluster-server/#comment-101 rafaelri Fri, 11 Dec 2009 23:13:54 +0000 http://itdevworld.wordpress.com/?p=180#comment-101 Hi Sai, Sorry but I sincerely don't know. I'd suggest that you ask this on <a href="http://www.ibm.com/developerworks/forums/forum.jspa?forumID=266" rel="nofollow">WebSphere Application Server Forum</a>. best regards Hi Sai,

Sorry but I sincerely don’t know. I’d suggest that you ask this on WebSphere Application Server Forum.

best regards

]]> By: sai pavan http://itdevworld.wordpress.com/2009/05/03/websphere-concepts-cell-node-cluster-server/#comment-100 sai pavan Tue, 08 Dec 2009 15:49:28 +0000 http://itdevworld.wordpress.com/?p=180#comment-100 Hi Rafaelri, i have one question which was asked in an interview. there are 5 cells on a node .in order to do single sign on, hw many times we have to exchange the keys between these 5 cells? Hi Rafaelri,
i have one question which was asked in an interview.
there are 5 cells on a node .in order to do single sign on, hw many times we have to exchange the keys between these 5 cells?

]]> By: rafaelri http://itdevworld.wordpress.com/2009/05/03/websphere-concepts-cell-node-cluster-server/#comment-98 rafaelri Tue, 01 Dec 2009 01:08:16 +0000 http://itdevworld.wordpress.com/?p=180#comment-98 Hi Shrini, Sincerely I never saw this error message ... In regard to multiple servers on a single node, no problem it is perfectly fine, you'll see the multiples servers at DMgr profile and you'll also be able to select in which of them (server or cluster) your application module will be installed (you can even change it after it is installed under manage modules option). Then, after application is installed and if it is set to auto start with server you only need to start the corresponding server, for this to happen the node agent needs to be running (so the node is active). best regards, Rafael Ribeiro Hi Shrini,

Sincerely I never saw this error message … In regard to multiple servers on a single node, no problem it is perfectly fine, you’ll see the multiples servers at DMgr profile and you’ll also be able to select in which of them (server or cluster) your application module will be installed (you can even change it after it is installed under manage modules option).
Then, after application is installed and if it is set to auto start with server you only need to start the corresponding server, for this to happen the node agent needs to be running (so the node is active).

best regards,
Rafael Ribeiro

]]> By: Shrinivas http://itdevworld.wordpress.com/2009/05/03/websphere-concepts-cell-node-cluster-server/#comment-97 Shrinivas Mon, 30 Nov 2009 12:43:59 +0000 http://itdevworld.wordpress.com/?p=180#comment-97 Hi, Nice posting very informative. I have a question for you. I have installed multiple server instance under one profile. How do i manage those server, i mean how do i start and stop server. Do i need to have Node agent and Node configured for that. I am using WS v 6.1 Network Deployemtn with advance install option. Whien i try to start application configiured on differetn server i get error "Activities can not be started because it is installed on a different server" Kindly let me know your inpiuts Thanks Shrini Hi,

Nice posting very informative. I have a question for you. I have installed multiple server instance under one profile. How do i manage those server, i mean how do i start and stop server. Do i need to have Node agent and Node configured for that. I am using WS v 6.1 Network Deployemtn with advance install option.
Whien i try to start application configiured on differetn server i get error

“Activities can not be started because it is installed on a different server”

Kindly let me know your inpiuts

Thanks
Shrini

]]> By: Samba http://itdevworld.wordpress.com/2009/05/03/websphere-concepts-cell-node-cluster-server/#comment-93 Samba Sat, 07 Nov 2009 01:42:11 +0000 http://itdevworld.wordpress.com/?p=180#comment-93 Thanks this info especially the diagram gave me some basic ideas about the concepts. You may want to include some description of deployment manager, as it definitely works hand in hand with the node, cell concepts. Thanks this info especially the diagram gave me some basic ideas about the concepts.
You may want to include some description of deployment manager, as it definitely works hand in hand with the node, cell concepts.

]]> By: rafaelri http://itdevworld.wordpress.com/2009/05/03/websphere-concepts-cell-node-cluster-server/#comment-79 rafaelri Sun, 06 Sep 2009 02:05:19 +0000 http://itdevworld.wordpress.com/?p=180#comment-79 no. it wont work. another mandatory process is the dmgr. it seems like node agent play part of the role of a name server for the node. no. it wont work. another mandatory process is the dmgr.
it seems like node agent play part of the role of a name server for the node.

]]> By: rafaelri http://itdevworld.wordpress.com/2009/05/03/websphere-concepts-cell-node-cluster-server/#comment-78 rafaelri Sun, 06 Sep 2009 02:04:23 +0000 http://itdevworld.wordpress.com/?p=180#comment-78 Hi Sri, Probably you have anything wrong with your messaging engine runtime (eg.: your storage folder has files from a previous running engine or database tables are shared by multiple engines [tables for storage are exclusive]) check these common problems. Hi Sri,

Probably you have anything wrong with your messaging engine runtime (eg.: your storage folder has files from a previous running engine or database tables are shared by multiple engines [tables for storage are exclusive]) check these common problems.

]]> By: sri http://itdevworld.wordpress.com/2009/05/03/websphere-concepts-cell-node-cluster-server/#comment-74 sri Thu, 20 Aug 2009 09:48:51 +0000 http://itdevworld.wordpress.com/?p=180#comment-74 HI, ple help to solve my problem.I created bus member,destination nd also message engine. message engine have to get started automaticaaly but it did not get start.unavailable symbol is showing. ple resolve my problem. Below mentioned is the error when i'm trying to start to start the message engine. "The messaging engine jaya-e6885a8c72Node01.server1-MsgBus cannot be started as there is no runtime initialized for it yet, retry the operation once it has initialized. If dynamic configuration reload is not enabled for this bus then the server will need to be restarted". HI,
ple help to solve my problem.I created bus member,destination nd also message engine. message engine have to get started automaticaaly but it did not get start.unavailable symbol is showing. ple resolve my problem.

Below mentioned is the error when i’m trying to start to start the message engine.

“The messaging engine jaya-e6885a8c72Node01.server1-MsgBus cannot be started as there is no runtime initialized for it yet, retry the operation once it has initialized. If dynamic configuration reload is not enabled for this bus then the server will need to be restarted”.

]]> By: sri http://itdevworld.wordpress.com/2009/05/03/websphere-concepts-cell-node-cluster-server/#comment-72 sri Wed, 19 Aug 2009 12:55:24 +0000 http://itdevworld.wordpress.com/?p=180#comment-72 hi, i'm getting more information from ur post. I had a doubt. node agent is connected to servers so when a node agent is down or it is not working. wil servers work or not. hi,
i’m getting more information from ur post. I had a doubt.
node agent is connected to servers so when a node agent is down or it is not working. wil servers work or not.

]]> By: rafaelri http://itdevworld.wordpress.com/2009/05/03/websphere-concepts-cell-node-cluster-server/#comment-64 rafaelri Thu, 16 Jul 2009 15:06:51 +0000 http://itdevworld.wordpress.com/?p=180#comment-64 I can guess that you mean a web request right? It boils down to the spec, it covers only that if the request is sent to multiple nodes in a cluster this session MUST be propagated. WebSphere by itself does not do load balancing for web request between servers in a cluster, you need to install IHS or Edge components for this purpose and how the request will be spread is responsibility of IHS and Edge. And this is also an option that is up to you, it depends on your load scenario, application requirements, etc. There are cases where affinity is the way to go, but affinity comes with the price that you might overload one server. Edge components provide an (almost) smart tool that can monitor IHS to check its load but still it can't check WebSphere load. regards, Rafael Ribeiro I can guess that you mean a web request right?
It boils down to the spec, it covers only that if the request is sent to multiple nodes in a cluster this session MUST be propagated.
WebSphere by itself does not do load balancing for web request between servers in a cluster, you need to install IHS or Edge components for this purpose and how the request will be spread is responsibility of IHS and Edge. And this is also an option that is up to you, it depends on your load scenario, application requirements, etc. There are cases where affinity is the way to go, but affinity comes with the price that you might overload one server. Edge components provide an (almost) smart tool that can monitor IHS to check its load but still it can’t check WebSphere load.

regards,
Rafael Ribeiro

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