Questions on replication and h/w load balancer
Why does h/w load balancer have to support passive cookies and inspect them to
dispatch the request to the primary server first? If we have in-memory replication
and if h/w loadbalancer just dispatches the http request from the client to any
of the weblogic servers in the cluster wouldnt this work?
Is it to pin the session to the creator server to minimize the chance of replication
misses due to n/w issues, member server slow speed, buffer overwrite etc.
-Shiraz
Yes, and previous to 6.1 (?) if the request showed up at the wrong server it
would fail.
Peace,
Cameron Purdy
Tangosol Inc.
Tangosol Coherence: Clustered Coherent Cache for J2EE
Information at http://www.tangosol.com/
"Shiraz Zaidi" <[email protected]> wrote in message
news:3c15aa10$[email protected]..
>
> Why does h/w load balancer have to support passive cookies and inspect
them to
> dispatch the request to the primary server first? If we have in-memory
replication
> and if h/w loadbalancer just dispatches the http request from the client
to any
> of the weblogic servers in the cluster wouldnt this work?
>
> Is it to pin the session to the creator server to minimize the chance of
replication
> misses due to n/w issues, member server slow speed, buffer overwrite etc.
>
> -Shiraz
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And also if i used SCAN ip instead of VIP. how the settings will change.
Regards,Hi,
please find here an Whitepaper with the information
http://www.oracle.com/technetwork/database/features/availability/maa-wp-11gr2-client-failover-173305.pdf
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hello
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it is only EIGRP that can perform load balancing over unequal cost links.
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Hi,
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CEF and per-packet load balancing
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Question about scrolling and Movie Clips Loaded from the Library
I hope I am posting this in the right forum.
Ok, I'm using actionscript 2.0, and I am trying to make a scrolling image gallery. I have a movie clip with three layers. the first contains a movie clip used as a scroll bar. The second is a mask used to hide the overflow content, and the third contains movie clip thumbnails. when I click one of the thumbnails, it loads a symbol containing a larger version of the picture over top of the thumbnails on the same layer. My problem is, the large image is added at the very top of the movie clip, even when it is scrolled out of sight. I want it to appear in sight, so the user doesn't have to scroll all the way back up to the top to see it. This is annoying and confusing. Is there a way to do this?
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this.onMouseMove = null}Thanks for your reply. I'll try to explain it better. I have a long, vertically scrolling movie clip. This movie clip contains lots of thumbnails. When I click a thumbnail, the full sized image is loaded from the library and displayed within the same movie clip. when I click the full size movie clip, it disappears again, and I can click another thumbnail to display another full size image. So I'm not just adding more and more stuff to the gallery if that's what you were thinking. I'm just clicking thumbnails to display the full size image so I can look at it, closing it, and moving on.
But the full sized image is fixed at the very top of the scrolling movie clip, so if I click a thumbnail at the very bottom, I have to scroll all the way back up to the top to see the full size image. I just want the full size image to appear on screen no matter how far down I have scrolled to click a thumbnail.
I made my basic gallery useing this tutorial:
http://flashexplained.com/actionscript/making-the-ultimate-dynamic-image-gallery-in-flash- 8/
if you want to take a look at that, to get an idea of what I'm talking about.
Now I'm just trying to add some scrolling functionality, which wasn't included, but I don't really understand actionscript well enough to do this easily on my own.
Sorry for the long reply. I hope this is clearer. -
JMS and MQ series load balancing.
We have an interface that utilizes the JMS adapter and MQ series from websphere. From a high level, i wanted to ask , when you have additional cluster instances of the adapter framework running. How do the communication channels on these (say 2) instances know which one is to process the message. Or in the scenario, say one comm channel is already bottlenecked, how does the adapter engine know to forward the next JMS message to the other adapter.
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Your JMS adapter is just like your standalone JMS (java) program that puts and retrieves ur messages from the Queues. So u don't need to create any local Queues and QManagers on XI Server. U need to configure the Parameters as mentioned in ur Sender Adapter( WebsphereMQ (MQSeries) and u will be successfully able to retrieve the messages from MQSeries.
Make sure u have deployed the necessary jar's on ur XIServer to connect to WebsphereMQ.
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Jdbc urls and when does load balancing and failover work?
I you use a jdbc url with OracleDriver not OracleDataSource because we use dbcp for our connection pooling. What can we expect by putting in two connection descriptors one for each host when an 11g RAC node goes away?
I know all about ONS and FCF etc but when you are not using OracleDataSource and friends what benefit is there is having mulitple hosts in the jdbc url?
What is that recognises the other host in the jdbc url when a RAC node goes away? Is that integral to OracleDataSource or anything outside of OracleDriver?
right now we only have one HOST = in your jdbc url but I'm not sure how we would benefit by adding the second if we are not using OracleDataSource.Best I can suggest - step up and become the expert.
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Hi,
I have been trying to understand webloigc clustering and load balancing capabilities. I have been through the edocs but it does not explain how things work, instead they only emphasis on how to configure.
Consider the following scenario:
--------cisco firewall/load balancer------------
apatche1 apache2 apache3
-------------------firewall-------------------------
WLP1 WLP2 WLP3 WLP4
My questions are:
(1) how apache servers load balance incoming requests amongst the four portal instances? I understand that it will use weblogic proxy plug-in. the httpd.config also should be configured to proxy requests to WLP instances by adding the corresponding address:prot entries for each instance, using WebLogicCluster keyword.
(2) Weblogic cluster will have nothing to do with load balancing? The only benefit I get of configuring weblogic cluster is session replication, right?
(3) even failover is going to be handled by apache servers?
(4) if I need to use SSL and I need to have my SSL encryption/decryption to be done on WLP instances; apache servers will only forward requests, no encryption/decryption to be done on the web tier. Is this possible?
See in WebSphere the edge component will handle the load balancing and through it I can assign load weights for each appserver instance.
(5) Are there any best practice to implement load balancing and failover on weblogic portal?
I appreciate any input in this regards.1. yes, configure the apache plugin. put your 4 servers in the WeblogicCluster property (host:port,host:port...). The proxy will round robin requests between the servers in the cluster, although sessions are pinned to a single server. So if a request with a session (jsessionid cookie) comes in, it will read the primary server from the cookie and route it to that server.
note that we have had trouble with keep alives ON and load balancing. we had to turn keep alives off to get load balancing working.
2. right, the cluster allows failover by replication. apache plugin will perform the failover.
3. the plugin will keep a dynamic server list so if a server goes down, it will update the cluster list and not route to it. it will also retry requests on another server on an error or timeout connecting. you can tweak timeout settings like WLSocketTimeoutSecs and ConnectTimeoutSecs. and keep idempotent ON which allows failover, unless you aplpication can't handle this. -
Lync 2013 Enterprise load balancing on the front end and edge pool
Hi,
I am setting up a Lync 2013 Enterprise deployment consisting of a Front End pool (x2 FE servers) and an Edge pool (x2 Edge servers). I'm seeing some conflicting advice regarding load balancing using hardware or DNS for the front end and the edge.
On the front end I have 2 internal DNS records 'lyncfepool1.contoso.local' each of which map to one of the IPs of the FE servers. I've used my details to populate the Detailed Design Planner excel spreadsheet and am told that I require a HLB to load
balance my front end pool. I'm aware of the need to load balance HTTPS traffic internally (which will be done by TMG) however other traffic to the front end (SIP, etc) can be balanced by DNS only, and not require a HLB?
Can someone clarify the front end requirement?
Also - looking now at the edge pool - this site again have two edge servers in a pool. We are using a total of six private IP addresses, two per edge service (2 x av.contoso.com, 2 x sip.contoso.com and 2 x webcon.contoso.com). These will be
NAT'ed by the external firewall and directed to the respective external (DMZ) IP addresses on the Edge servers on port 443. I know this isn't true roundrobin due to the intelligence of the Lync client when connecting (in that the Lync client will connect
to one of the public IPs and if it can't connect, it will know to connect to the other service IP), however I want to clarify this set up, particularly the need to direct the external public IP traffic at the DMZ Edge IP specified in the topology builder.
I've attached a basic diagram of the external/DMZ/Edge side which hopefully helps with this question
Persevere, Persevere, Per..That is because you will always need HLB for a front-end server since it hosts the Lync webservices which use HTTP/HTTPS traffic.
The description on the calculation tool also describes this correctly:
Supports Standard and Enterprise pools (up to 12 nodes), with pure device-based load balancing or a combination of DNS load balancing and device-based load balancing (for
Lync web services)
You can use either Hardware or DNS loadbalancing for SIP traffic only, but you will always need a HLB for the webservices. Both are applicable for the Front-End so you have either
full HLB for both SIP and HTTP(S) traffic
DNS LB for SIP traffic and HLB for HTTP(S) traffic
Hope this is more clear :-)
Lync Server MVP | MCITP Lync Server 2010 | If you think my post is the answer to your question, please mark it as answer so future visitors can easily find it.
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