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  • Does Ubuntu 12.04.1 come with everything I need for using virtual servers and are the tools efficient?

    - by orokusaki
    I noticed that Ubuntu 12.04.1 comes with Xen, OpenStack, KVM and other virtualization-related tools. I have used VMWare in the past. If I was to use Xen for visualization, would I see considerable performance lost, since Xen is run on the host OS? Is it even run on the host OS, or is it like VMWare where it's installed below any Linux OS on the machine (embedded, I guess is the word)? Do you have any recommendations on what sort of set up to use with these built-in tools? I have 2 physical servers, side-by-side. Each will need a VM used for Postgres and a VM used as an app server. One will be a failover for the other.

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  • Bay Area Coherence Special Interest Group Next Meeting July 21, 2011

    - by csoto
    Date: Thursday, July 21, 2011 Time: 4:30pm - 8:15pm ET (note that Parking at 475 Sansome Closes at 8:30pm) Where: Oracle Office, 475 Sansome Street, San Francisco, CA Google Map We will be providing snacks and beverages. Register! - Registration is required for building security. Presentation Line Up:? 5:10pm - Batch Processing Using Coherence in Oracle Group Policy Administration - Paul Cleary, Oracle Oracle Insurance Policy Administration (OIPA) is a flexible, rules-based policy administration solution that provides full record keeping for all policy lifecycle transactions. One component of OIPA is Cycle processing, which is the batch processing of pending insurance transactions. This presentation introduces OIPA and Cycle processing, describing the unique challenges of processing a high volume of transactions within strict time windows. It then reviews how OIPA uses Oracle Coherence and the Processing Pattern to meet these challenges, describing implementation specifics that highlight the simplicity and robustness of the Processing Pattern. 6:10pm - Secure, Optimize, and Load Balance Coherence with F5 - Chris Akker, F5 F5 Networks, Inc., the global leader in Application Delivery Networking, helps the world’s largest enterprises and service providers realize the full value of virtualization, cloud computing, and on-demand IT. Recently, F5 and Oracle partnered to deliver a novel solution that integrates Oracle Coherence 3.7 with F5 BIG-IP Local Traffic Manager (LTM). This session will introduce F5 and how you can leverage BIG-IP LTM to secure, optimize, and load balance application traffic generated from Coherence*Extend clients across any number of servers in a cluster and to hardware-accelerate CPU-intensive SSL encryption. 7:10pm - Using Oracle Coherence to Enable Database Partitioning and DC Level Fault Tolerance - Alexei Ragozin, Independent Consultant and Brian Oliver, Oracle Partitioning is a very powerful technique for scaling database centric applications. One tricky part of partitioned architecture is routing of requests to the right database. The routing layer (routing table) should know the right database instance for each attribute which may be used for routing (e.g. account id, login, email, etc): it should be fast, it should fault tolerant and it should scale. All the above makes Oracle Coherence a natural choice for implementing such routing tables in partitioned architectures. This presentation will cover synchronization of the grid with multiple databases, conflict resolution, cross cluster replication and other aspects related to implementing robust partitioned architecture. Additional Info:?? - Download Past Presentations: The presentations from the previous meetings of the BACSIG are available for download here. Click on the presentation titles to download the PDF files. - Join the Coherence online community on our Oracle Coherence Users Group on LinkedIn. - Contact BACSIG with any comments, questions, presentation proposals and content suggestions.

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  • Multi Monitor setup goes crazy after locking/unlocking Vista machine

    - by Farseeker
    Give me a 10-blade quad-processor quad-core Opteron centre and ask me to configure failover/load balancing and I'd be happy to, but the following problem has got me completely stumped. My Vista Business Professional machine, running Ultramon, has three monitors attached. When I lock the machine (to go to the delicious cafe around the corner), the monitor layout stays correct. When I unlock it, I watch as all my screens flicker (as they are being re-configured), and Vista chooses some crazy layout for the monitors. The most recent one is below, but it's never consistant. Any ideas what might cause this? It's Vista Business, with UltraMon 3.0 (exiting Ultramon makes no difference).

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  • links for 2011-02-02

    - by Bob Rhubart
    Oracle WebLogic's YouTube Channel Tired of reading? Watch and learn.  (tags: oracle weblogic youtube) Chris Muir: JDev: ADF BC and ADF Libraries: The Library Private property Oracle ACE Director Chris Muir illustrates the use of ADF Libraries. (tags: oracle otn oracleace) Satyajith Nair: Starting a SOA Project? Don't forget the Service Registry!! Satyajith Nair argues that "even with small projects, adding a Service Registry in the architecture has significant benefits with regards to Developer Productivity, Build Quality, Ease of maintenance and Architecture Flexibility." (tags: oracle infosys soa serviceregistry soagovernance) Matthias Wessendorf: Weblog Apache MyFaces in the cloud - Part II Matthias Wessendorf says: "A few days ago I did a quick test to see how well Apache MyFaces works in the cloud. The Amazon Beanstalk test was a success." (tags: oracle apache cloud) SOA & E2.0 Partner Community Forum - registration is open! (SOA Partner Community Blog) Jurgen Kress with an update on next month's event in the Netherlands. (tags: oracle otn soa enterprise2.0) Well Hello There, WebCenter PS3 VM | The AppsLab Jake Kuramoto says: "You may recall my struggle last year to assemble and document a WebCenter VM. Well, apparently other people thought it was a good idea..." (tags: oracle otn enterprise2.0 webcenter) InfoQ: Proving the Business Value of SOA Anne Thomas Manes discusses SOA goals and objectives used to measure a system’s success, measuring the business value, SOA project metrics, and recommendations on proving the business value of SOA. (tags: ping.fm) InfoQ: Amazon Will Offer Oracle Database 11g on RDS Amazon will offer Oracle Database 11g on RDS which brings patching, backup, replication, and failover support to Oracle’s database. (tags: ping.fm)

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  • Most suitable high availability solution

    - by Alex Bagnolini
    My company is hosting a website in a server with IIS, SQL Server and a 3rd party windows service (written in C#, source code available for amendments). We bought a new identical server, composed by: 1x Quad Core, 12GB RAM, 4x160GB SATA Raid 5, Windows Server 2008 R2 Datacenter, Public IP. We aim to put all webpages and the 3rd party windows service in an high-availability state. After some lab-testing on how to configure Failover Clustering and Hyper-V, we have deep doubts on what the "best" solution would be, by "best" meaning maintainable and able to correctly handle a physical server failure. Any suggestion on how we should configure the two servers? We don't need all the configuration's step, just an hint on the right direction to follow.

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  • Which is the best way to deploy a JBoss application?

    - by andreash
    Hi there, we are currently developing a JBoss application. To deploy it, we have a total of four servers (three years old). I am wondering which might be the best to do? There could be a load balancer (even a load-balancer cluster, for failover) in front of two servers, each holding one JBoss and one PostgreSQl host inside XEN environments. Does this make sense? Are there other, better options? Thanks a lot for your advice!

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  • reaching 99.9999% uptime

    - by user35204
    I am currently developing a project which is mission-critical. The actual domain name is registered with 1 & 1 and I plan on purchasing DynDNS Custom DNS service (which has 5 different geographical locations for DNS) and then another secondary DNS service to make sure my DNS is as failover safe as possible. Does it matter that the registration is with 1 & 1 - are they a weak link in the chain? All I really use them for is to say that DynDNS is my primary DNS nameserver and then my secondary DNS is my other nameserver. I can transfer the registration to DynDNS - Im just not sure if it really matters or not. Thanks

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  • Real time mirroring between two sql server databases

    - by Matt Thrower
    Hi, I'm a c# programmer, not a DBA and I've had the (mis)fortune to be handed a database admin task. So please bear this in mind when answering this question. What I've been asked to do is to create a real time two-way mirror between two databases with a 10 Megabit connection between them. So when either changes it updates the other. This is not a standard data mirroring/failover task where one DB is the master and the other is a backup - both are live and each needs to instantly reflect changes made to the other. In my head this sounds like a tall order, one which may even be impossible - after all in a rapidly changing environment with lots of users this is going to be massively resource intensive and create locks and queues of jobs all over the place. Is it possible? If so, can anyone either give me some basic instructions and/or point me at some places to start my reading and research? Cheers, Matt

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  • High availability for Windows Service under Windows Server 2003

    - by empi
    Hi. I have a following situation: I need to deploy a windows service that listens for incoming request on tcp port (basically WCF service). I have a High Availability requirement - the service must be deployed on two servers and if the service stops (only the service, not the whole server) on one server, all the requests must be redirected to the second one. For me it looks like a basic failover scenario. How can I achieve this on Windows Server 2003? Should I use Microsoft Cluster Service or Network Load Balancing? The important part is that the process of swapping the servers should not concern the clients (the client must see only single address / single host or domain name). Thanks in advance for help.

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  • Hyper-V cluster VS regular cluster

    - by Sasha
    We need to choice between Hyper-V and regular cluster technologies. What is the advantage and disadvantage of these approaches? Update: We have to physical servers and want to build reliably solution using cluster approach. We need to clustering our application and DB (MS SQL). We know that we can use: Regular Windows Cluster Service. Application and DB will be migrating from one node to other. Hyper-V Failover Cluster. Virtual machine will be migrating from one node to other. Combined variant. DB mirroring for MS SQL and Hyper-V for our application. We need to make a choice between this approach. So we need to know advantage and disadvantage of these approaches?

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  • Bash script won't stay open in background after running through while

    - by jfreak53
    I can't get the following bash script to stay open after the first message is received from NC: #!/bin/bash port=3333 nc -l $port | while read msg; do notify-send Alert "$msg"; done After the first message it exits. I want it to stay open and continue monitoring for new messages from NC. I know that if I launch nc -l port without the while loop it stays open and I can chat away between the two connections even disconnect from the connected host. I am sending the message using: echo 'done' | nc IP port

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  • KVM Bridged Network Not Working

    - by EApubs
    I just installed KVM on my Ubuntu Server according to this guide : https://help.ubuntu.com/community/KVM/Installation Then prepared a bridged network as shown in here : https://help.ubuntu.com/community/KVM/Networking Then, I created a virtual machine with virt-manager. I tried several times but the guest fails to connect to the network! Any help? ifconfig : br0 Link encap:Ethernet HWaddr d0:27:88:b0:e4:38 inet addr:192.168.20.100 Bcast:192.168.20.255 Mask:255.255.255.0 inet6 addr: fe80::d227:88ff:feb0:e438/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:62 errors:0 dropped:0 overruns:0 frame:0 TX packets:62 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:10493 (10.4 KB) TX bytes:8433 (8.4 KB) eth0 Link encap:Ethernet HWaddr d0:27:88:b0:e4:38 UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:62 errors:0 dropped:0 overruns:0 frame:0 TX packets:63 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:11361 (11.3 KB) TX bytes:8479 (8.4 KB) Interrupt:41 lo Link encap:Local Loopback inet addr:127.0.0.1 Mask:255.0.0.0 inet6 addr: ::1/128 Scope:Host UP LOOPBACK RUNNING MTU:16436 Metric:1 RX packets:0 errors:0 dropped:0 overruns:0 frame:0 TX packets:0 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:0 (0.0 B) TX bytes:0 (0.0 B) virbr0 Link encap:Ethernet HWaddr 5a:8c:57:95:af:3b inet addr:192.168.122.1 Bcast:192.168.122.255 Mask:255.255.255.0 UP BROADCAST MULTICAST MTU:1500 Metric:1 RX packets:0 errors:0 dropped:0 overruns:0 frame:0 TX packets:0 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:0 (0.0 B) TX bytes:0 (0.0 B) brctl show : bridge name bridge id STP enabled interfaces br0 8000.d02788b0e438 no eth0 virbr0 8000.000000000000 yes brctl showmacs br0 : port no mac addr is local? ageing timer 1 5c:d9:98:67:b6:28 no 48.33 1 d0:27:88:b0:e4:38 yes 0.00 1 e0:2a:82:f9:6c:09 no 0.00 ip route : default via 192.168.20.1 dev br0 metric 100 192.168.20.0/24 dev br0 proto kernel scope link src 192.168.20.100 192.168.122.0/24 dev virbr0 proto kernel scope link src 192.168.122.1 *In the guest * I was unable to copy paste the info from the guest because can't ssh to it. It didn't get any ip from DHCP. Won't work even after setting it up manually.

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  • How do I patch a kernel bug?

    - by Primož Kralj
    Sometimes I can't boot my laptop - it gets stuck here: Then I have to do a hard-reset and it's fine. I checked the boot logs and this is what I think it's causing it (nevermind the timestamp inconsistencies): [38.377595] BUG: unable to handle kernel NULL pointer dereference at (null) [38.377821] IP: [<ffffffffa01f6d7b>] r600_pcie_gart_tlb_flush+0xeb/0x110 [radeon] [38.378065] PGD 121491067 PUD 121492067 PMD 0 [38.378214] Oops: 0000 [#1] SMP Here is the full log. I found the patches but I have no idea about which to use and how.

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  • How to check SERP position correctly?

    - by Cengiz Frostclaw
    I wonder how do you check your website's SERP position for a certain query. I cannot directly go to Google and search, because it knows i'm looking for my site, and it shows it in the first position, but from another browser, it cannot be even in the first page. So how do you check for "average user" ? I use Tor browser for that, since it gives me a completely different IP, do you think is it safe? I mean, does it give useful information ?

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  • Set up DPM to use hardware VSS Provider with EMC Clariion SAN

    - by Ryan
    We recently purchased an EMC Clariion AX4 SAN and we're using it to provide storage for our Hyper-V virtual machines. I've already got the servers registered with it and configured the failover cluster CSV's, etc. I'm wanting to figure out what I have to do to set up the VSS Provider for the SAN, so that Microsoft Data Protection Manager can use it to backup the virtual machines. I'm new when it comes to Clariion SAN's, so I have no idea how to set up the VSS provider. I downloaded something from Powerlink that was labeled VSS Provider and installed it on one of the machines connected to the SAN. It had something to do with a Solutions Enabler (I don't know what that is), but it doesn't really seem like it did anything. I read something that suggested I'd need to have Navisphere Manager to use the VSS Provider on the AX4, but we didn't purchase that - we're just using Navisphere Express. Can anyone help me figure out how to get the VSS Provider up and running?

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  • Setting up Ubuntu Server as a Router with DHCPD and 3 Ethernet devices

    - by cengbrecht
    My configuration: Ubuntu 12.04 DHCP3-server eth0, eth1, eth2 Edit: removed br0&br1 eth0 is the external connection eth1 & eth2 are the internal network eth1 and eth2 are supposed to be seperate networks of student/teachers respectivly. What I would like to have is the internet from external device bridged to device 1 and 2, with the DHCP server controlling the two internal devices. Its already working with DHCP, the part I am stuck on is bridging for internet. I have setup a script that I found here: Router With the original script he linked here: Ubuntu Router Guide echo -e "\n\nLoading simple rc.firewall-iptables version $FWVER..\n" IPTABLES=/sbin/iptables #IPTABLES=/usr/local/sbin/iptables DEPMOD=/sbin/depmod MODPROBE=/sbin/modprobe EXTIF="eth0" INTIF="eth1" INTIF2="eth2" echo " External Interface: $EXTIF" echo " Internal Interface: $INTIF" echo " Internal Interface: $INTIF2" EXTIP=`ifconfig $EXTIF | grep 'inet addr:' | sed 's#.*inet addr\:\([0-9]\{1,3\}\.[0-9]\{1,3\}\.[0-9]\{1,3\}\.[0-9]\{1,3\}\).*#\1#g'` echo " External IP: $EXTIP" #====================================================================== #== No editing beyond this line is required for initial MASQ testing == The rest of the script below this is as is. I can get ip from the eth1 & eth2 devices, and my computer can see them, and them it, however, internet is not being passed through. If you need more information please just let me know. EDIT: So I had a 255.255.254.0 network, I believe that was causing the issue. Not sure if it will matter on the second card, I will test later. After changing the subnet to 255.255.255.0 the pings will pass through, however, I cannot get DNS requests to pass? My new Config for Firewall Rules # /etc/iptables.up.rules # Generated by iptables-save v1.4.12 on Wed Nov 28 19:43:28 2012 *mangle :PREROUTING ACCEPT [39:4283] :INPUT ACCEPT [39:4283] :FORWARD ACCEPT [0:0] :OUTPUT ACCEPT [12:4884] :POSTROUTING ACCEPT [13:5145] COMMIT # Completed on Wed Nov 28 19:43:28 2012 # Generated by iptables-save v1.4.12 on Wed Nov 28 19:43:28 2012 *filter :FORWARD ACCEPT [0:0] :INPUT ACCEPT [0:0] :OUTPUT ACCEPT [0:0] -A FORWARD -j LOG -A FORWARD -m state -i eth1 -o eth0 --state NEW,ESTABLISHED,RELATED -j ACCEPT -A FORWARD -m state -i eth2 -o eth0 --state NEW,ESTABLISHED,RELATED -j ACCEPT -A FORWARD -m state -i eth0 -o eth1 --state NEW,ESTABLISHED,RELATED -j ACCEPT -A FORWARD -m state -i eth0 -o eth2 --state NEW,ESTABLISHED,RELATED -j ACCEPT COMMIT # Completed on Wed Nov 28 19:43:28 2012 # Generated by iptables-save v1.4.12 on Wed Nov 28 19:43:28 2012 *nat :INPUT ACCEPT [0:0] :PREROUTING ACCEPT [0:0] :OUTPUT ACCEPT [0:0] :POSTROUTING ACCEPT [0:0] -A POSTROUTING -o eth0 -j MASQUERADE -A POSTROUTING -o eth0 -j SNAT --to-source 192.168.1.25 COMMIT # Completed on Wed Nov 28 19:43:28 2012 Not sure what else you may need, but I am using Webmin to control the server(Needed for the operators on site to know how to use it.) If you could explain it as standard CLI commands, or edits to this file directly then we should be ok. :) And thanks again Erik, I do believe your edits did help.

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  • June 23, 1983: First Successful Test of the Domain Name System [Geek History]

    - by Jason Fitzpatrick
    Nearly 30 years ago the first Domain Name System (DNS) was tested and it changed the way we interacted with the internet. Nearly impossible to remember number addresses became easy to remember names. Without DNS you’d be browsing a web where numbered addresses pointed to numbered addresses. Google, for example, would look like http://209.85.148.105/ in your browser window. That’s assuming, of course, that a numbers-based web every gained enough traction to be popular enough to spawn a search giant like Google. How did this shift occur and what did we have before DNS? From Wikipedia: The practice of using a name as a simpler, more memorable abstraction of a host’s numerical address on a network dates back to the ARPANET era. Before the DNS was invented in 1983, each computer on the network retrieved a file called HOSTS.TXT from a computer at SRI. The HOSTS.TXT file mapped names to numerical addresses. A hosts file still exists on most modern operating systems by default and generally contains a mapping of the IP address 127.0.0.1 to “localhost”. Many operating systems use name resolution logic that allows the administrator to configure selection priorities for available name resolution methods. The rapid growth of the network made a centrally maintained, hand-crafted HOSTS.TXT file unsustainable; it became necessary to implement a more scalable system capable of automatically disseminating the requisite information. At the request of Jon Postel, Paul Mockapetris invented the Domain Name System in 1983 and wrote the first implementation. The original specifications were published by the Internet Engineering Task Force in RFC 882 and RFC 883, which were superseded in November 1987 by RFC 1034 and RFC 1035.Several additional Request for Comments have proposed various extensions to the core DNS protocols. Over the years it has been refined but the core of the system is essentially the same. When you type “google.com” into your web browser a DNS server is used to resolve that host name to the IP address of 209.85.148.105–making the web human-friendly in the process. Domain Name System History [Wikipedia via Wired] What is a Histogram, and How Can I Use it to Improve My Photos?How To Easily Access Your Home Network From Anywhere With DDNSHow To Recover After Your Email Password Is Compromised

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  • Unable to connect to the Internet via LAN despite the connection showing as established

    - by Vikram
    I have installed Ubuntu 11.10. I am facing a problem connecting via LAN. We have a firewalled network. After entering static IP, gateway, DNS, etc., it shows connection as established but we are unable to use the Internet using the wired connection (LAN). While checking system testing following error shows under network test: ERROR:root:Could not find def gateway info in /proc ERROR:root:Could not find default gateway by running route

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  • Shared FC LVM VG with LVs for each KVM VM. Clvm required?

    - by Cocoabean
    I have 2 virtual machine hosts running Ubuntu 12.04 and KVM managed with libvirt. They are both connected to the same VG which is a LUN on my SAN over FC. I provision LVs on this shared VG for each VM. I don't think I need HA or failover, but I do want live migration between the hosts. Do I need clvm in this case? As long as I don't try to start the same VM on each host should this work? Clvm requires lots of overhead with clustering tools that I don't think I need. I can deal with manually restarting VMs on other hosts in the event of a hardware failure.

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  • MySQL port 3306 became filtered when configured with Keepalived on Ubuntu server 12.04 lts

    - by Ludwig
    I'm configuring two load balancer (lb01 & lb02) with keepalived for my two mysql server (db01 & db02) with standard port 3306. There is virtual ip address (192.168.205.10) to access it also act as failover, but somehow the web server in the front can't access this mysql server using vip. Here is my config: Keepalived: Only the mysql part that i added here. LB01: virtual_server 192.168.205.10 3306 { delay_loop 6 lb_algo rr lb_kind DR protocol TCP real_server 192.168.205.4 3306 { weight 10 TCP_CHECK { connect_port 3306 connect_timeout 2 } } } LB02: virtual_server 192.168.205.10 3306 { delay_loop 6 lb_algo rr lb_kind DR protocol TCP real_server 192.168.205.6 3306 { weight 10 TCP_CHECK { connect_port 3306 connect_timeout 2 } } } I already comment out the "bind-address=127.0.0.1" part in both server my.cnf. Also, remove all the firewall prog from my ubuntu server (ufw or iptables). Any help? thanks.

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  • Should I anticipate any problems trying to use the same SSL Cert on 2 computers (primary, backup)?

    - by Matt
    We have a production machine running IIS6 with a wildcard SSL certificate. The certificate that was installed is not exportable. We want to upgrade the system to IIS7. As part of this venture, we're creating a backup/failover server that will serve the exact same websites - when we take the primary down for upgrade, the secondary will take over. As such, the secondary also needs the SSL certificate. However, since the certificate was not exportable, this means re-keying it from Go Daddy. Per http://help.godaddy.com/article/867, I know that by re-keying the certificate the original will stop working. I'm still pretty new to SSL certificates, so are there any problems I should anticipate when installing the same SSL certificate on 2 different machines?

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  • ArchBeat Link-o-Rama for November 13, 2012

    - by Bob Rhubart
    This week on the OTN Solution Architect Homepage Make time to check out this week's features on the OTN Solution Architect Homepage, including: SOA Practitioner Guide: Identifying and Discovering Services Setting Up, Configuring, and Using an Oracle WebLogic Server Cluster OTN ArchBeat Podcast: Are You Future Proof (Conclusion) Keynote: New Paradigms for Application Architecture: From Applications to IT Services I this keynote address from the SOA, Cloud, and Service Technology Symposium, Anne Thomas Manes highlights the importance of adapting to the current trend marked by the convergence of mobile, social and cloud, moving away from app-centric design to service-based solutions. New Solaris Cluster! | Jeff Victor "Oracle Solaris Cluster 4.1 offers both High Availability (HA) and also Scalable Services capabilities," explains Jeff Victor. "HA delivers automatic restart of software on the same cluster node and/or automatic failover from a failed node to a working cluster node. Software and support is available for both x86 and SPARC systems." You'll find download links and other resources in Jeff's short post. ADF BC View Accessor To Centralize Business Logic Processing | Andrejus Baranovskis Oracle ACE Director Andrejus Baranovskis illustrates one way to implement a use case that requires a comparison between the current row status and the data returned by another query (no master-detail relationship). Thought for the Day "The danger from computers is not that they will eventually get as smart as men, but that we will meanwhile agree to meet them halfway." — Bernard Avishai Source: SoftwareQuotes.com

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  • Clustering and custom applications

    - by Ahmed ilyas
    I was not entirely sure what tags to put but hope this is ok. This is just a general question in regards to clustering and applications: so lets say we have a clustered environment setup. We cluster SQL Server (I dont know exactly how its done but lets just say its been done for the sake of argument). Now if a website or application is trying to access that database for read/write (say an ASP.NET app or a C# Winforms app) and during that time SQL goes down - it takes a couple of minutes for the clustering failover to take affect to switch to another node. What happens during this time? I think it will time out/unable to connect. BUT is there a way for it to place the request in some pipeline so when the cluster node is back up/switched over it will continue as normal? as you can see, I know nothing much about clustering! what about your own custom .NET apps? Would there be a special way to develop them? I know that you can say create a simple Hello world app, and cluster that but they wouldnt be something you could see interms of the UI or anything, so they would effectively need to be developed as a Windows Service perhaps or even as a standard Console app which runs and not wait for user input but you wouldnt see any output from it (unless you redirect output to somewhere else) What im getting at here is... for those who have experience or developed a cluster application in .NET, how did you do it and what are the things to be aware of? For example we have the cloud service - fundamentally its built on clustering - if there is an outage, another node takes place and service is resumed as normal but we dont really see much of that downtime.

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