Application delivery architecture alternatives

Hi All,
For those who might have confronted the problem of dealing with the provisioning of applications across WAN links hosted out of central / single instances data center, far away from the primary user base, would know that provisioning of GbE or investing in LAN technologies / superdome servers exclusively, doesn't make much sense anymore.
With an upcoming proposal to host a single instance ERP systems out of a datacenter in an asian country, I am confronted with the same problem. I do understand that WAN optimisers, application load balancers coupled with suffcient bandwidths & a 24/7 network operations center to cater for my 10,000 odd user base, apread across different parts of the world, are a given.
What else?
Is a single instance model of an ERP ( as proposed by our SIs) the best design? To me, even though hosted in our own datacenter this would be just a simulation of cloud computng architecture.
Can the instances be spread across various countries to enhance user experience and increase app response times? I am a bit worried that 'change management' of users who currently access the legacy ERP application over the LAN bandwidths of a giga range, would not be an easy process and I need to technically design the most efficient app delivery process across the WAN links, as possible.
Any advise is welcome!
Rgds

On Mon, 27 Jun 2005 14:15:32 GMT, [email protected] wrote:
> Does Zenworks provide Bandwidth Throttling on Application delivery for
> Handheld devices specially BlackBerry ones ?
hmm... IIRC you can configure Bandwith usage.. don't know if it differens
between supported platforms though... also keep in mind that AFAIK
Blackberry Java Version is not supported at the moment... don't know about
ZFH 7.0 though..
Marcus Breiden
Please change -- to - to mail me.
The content of this mail is my private and personal opinion.
http://www.edu-magic.net

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Hi,
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Hello guys,
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p.s. I am thinking about using JBoss as an Application Server. I tested it and wrote some tests. They work and run fast enough, so I like it. Moreover it has module architecture.
Please, give me some advises and tips!
Thank you in advance!

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This topic first appeared in the Spiceworks Community

I have a windows 8.1 point of sale system that I would like to use with tablets. What are your recommendations on the best (cheapest/smoothest performance) setup. Here are my thoughts so far:
1. Run POS application directly on windows tablets.
Pros: cheap, no vmware or citrix or any virtualization or windows CAL needed.
Cons: Can only run on windows 8.1 tablets. I feel that the POS program performance is a little slow with the database connection over wifi. It stutters (1-2 seconds) everytime the program has to read the database.
2. Citrix XenApp or XenDesktop
So I am new to any virtualization but am trying to learn, just bought a dell poweredge 2950.
Pros: Assume alot smoother and can run on any android or apple device.
Cons: Expensive.
This topic first appeared in the Spiceworks Community

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With Ajay Kumar and Telmo Pereira
Welcome to the Cisco Support Community Ask the Expert conversation. This is an opportunity to learn and ask questions about configuration and troubleshooting the Cisco Application Control Engine (ACE) load balancer with Cisco expert Ajay Kumar and Telmo Pereira. The Cisco ACE Application Control Engine Module for Cisco Catalyst 6500 Series Switches and Cisco 7600 Series Routers is a next-generation load-balancing and application-delivery solution. A member of the Cisco family of Data Center 3.0 solutions, the module: Helps ensure business continuity by increasing application availability Improves business productivity by accelerating application and server performance Reduces data center power, space, and cooling needs through a virtualized architecture Helps lower operational costs associated with application provisioning and scaling
Ajay Kumar is a customer support engineer in the Cisco Technical Assistance Center in Brussels, covering content delivery network technologies including Cisco Application Control Engine, Cisco Wide Area Application Services, Cisco Content Switching Module, Cisco Content Services Switches, and others. He has been with Cisco for more than four years, working with major customers to help resolve their issues related to content products. He holds DCASI and VCP certifications.
Telmo Pereira is a customer support engineer in the Cisco Technical Assistance Center in Brussels, where he covers all Cisco content delivery network technologies including Cisco Application Control Engine (ACE), Cisco Wide Area Application Services (WAAS), and Digital Media Suite. He has worked with multiple customers around the globe, helping them solve interesting and often highly complex issues. Pereira has worked in the networking field for more than 7 years. He holds a computer science degree as well as multiple certifications including CCNP, DCASI, DCUCI, and VCP
Remember to use the rating system to let Ajay know if you have received an adequate response.
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Hello Krzysztof,
Another set of good/interesting questions posted. Thanks!
I will try to clarify your doubts.
In the output below both resources (proxy-connections and ssl-connections rate) are configured with a min percentage of resources (column Min), while 'Max' is set to equal to the min.
ACE/Context# show resource usage
                                                     Allocation
        Resource         Current       Peak        Min        Max       Denied
-- outputs omitted for brevity --
proxy-connections             0      16358      16358      16358      17872
ssl-connections rate          0        626        626        626      23204
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We have a good reference for ACE resource planning that contains also description of all resources (this will help to understand the output better):
http://www.cisco.com/en/US/docs/interfaces_modules/services_modules/ace/v3.00_A2/configuration/virtualization/guide/config.html#wp1008224
1) When a resource is utilized to its maximum limit, the ACE denies additional requests made by any context for that resource. In other words, the action is to Drop. ACE should in theory silently drop (No RST is sent back to the client). So unless we changed something on the code, this is what you should see.
To give more context, seeing resets with SSL connections is not necessarily synonym of drops. As it is usual to see them during normal transactions.
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2) ACE will simply drop/ignore new connections when we reach the maximum amount of proxied connections for that context. Exisiting connections will continue there.
As ACE doesn't respond back, client would simply retransmit, and if he is lucky maybe in the next attempt he will be able to establish the connection.
To overcome the denies, you will definitely have to increase the resource allocation. This of course, assuming you are not reaching any physical limit of the box.
As mentioned setting max as unlimited might work for you, assuming there are a lot of unused resources on the box.
3) If a new connection comes in with a sticky value, that matches the sticky entry of a real server, which is already in MAXCONNS state, then both the ACE module/appliance should reject the connection and that sticky entry would be removed.
The client would at that point reestablish a new connection and ACE would associate a new sticky entry with the flow for a new RSERVER after the loadbalancing decision.
I hope this makes things clearer! Uff...
Regards,
Telmo

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There is no way for a user to fix this. The only thing you can do is not let Spotlight define the kind. Thus, if you bring up a search window do not use the Kind drop-down menu to select Application. Instead select Other from the menu and then type Application. You then get only things whose type declaration is Application, and you don't get jar files or widgets.
The other option is to exclude jar files by typing
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