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  • Long running php script hangs/terminates on IIS 7.5

    - by Rich
    I'm a bit of nube when it comes to configuring IIS 7.5 and Php so apologies if this is a silly question but I've been wrestling with this for over half the day and need some fresh input. I have a php application running on IIS 7.5 , php 5.4 running as fastcgi. The application works absolutley fine with the exception that long running php scripts seem to hang; no 500 error they simply seem never complete and return the results to the browser. I've written a simple test script below to eliminate the possibility of programming error in the main app : <?php /* test timeout */ /*set_time_limit(110);*/ echo "Testing time out in seconds\n"; for ($i = 0; $i < 175; $i++) { echo $i." -- "; if(sleep(1)!=0) { echo "sleep failed script terminating"; break; } } ?> If I run the script beyond 175 seconds it hangs. Below that it will return the results to the browser. Here are the time out parameters that I've set for php and fastcgi. I've also played around setting these really low in order to get various time out errors and have succeeded which brings me to the conclusion that there's another setting that I'm missing .. perhaps. fastcgi activity timeout=800 Idle Timeout = 900 request Timeout 800 Php max_execution_time=700 Any solutions or pointers in the right direction would be very ... very welcome. Thanks

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  • i7 x980 at 70% speed

    - by Buxley
    Hi we bought a nice computer to use to solve optimization problems. intel i7 X980@3,33 Mhz with 12 Gb of Team Group 1600 MHz ddr3 Ram. When we use Gurobi The Computer uses all 12 cores at maximum in the beginning of the solve. However after a while (about 8 hrs) it all cores jump between 65 and 85% When I solve the same models on an I7 930 all cores are at a near 100% level even after longer solution times. we first thought that the Harddisk was the bottleneck since Gurobi writes out nodefiles after the memorylimit is used. However since the new computer have 12 GB of Ram we put the memorylimit to 7 GB so the solver only used the RAM and still with the same performance in the processor. Any Ideas about the bottleneck? As I said earlier it works at 100% for the first hours or so . Thanks very much for any answers! Our plan was to overclock it but we can't even get it to work at normal speed yet!

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  • Ubuntu inside VirtualBox is slow

    - by Kapsh
    I am running an Ubuntu instance on VirtualBox inside XP. Here are the details: Host: Windows XP Pro Guest: Ubuntu 8.10 Total RAM: 3GB RAM For VM: 1GB Total Video Memory: 128MB Video Memory for VM: 40MB Hard Drive: 200GB Hard Drive for VM: 30GB Processor: 2.80GHz Core Duo The problem is that whenever I am inside the virtual machine, things seem so much slower in general. For example Firefox, Eclipse take longer to load, dragging windows show a lag etc. I have tried running Ubuntu before (not inside a VM) and it seemed fantastically fast. So I am disappointed to have to deal with this situation. But I need access to the XP partition without having to reboot and hence the attempt. I am surprised with the perceived slowness since the whole world seems to be doing virtualization and I cannot imagine everyone works on slow systems knowingly. My question is - is there something I should be doing to boost performance? Am I doing something wrong? This is my home machine and I am not sure if this is the right forum to ask. Thanks.

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  • What is my BaseDN supposed to be with the following configuration of OpenLDAP?

    - by fuzzy lollipop
    I have the following in my OpenLDAP configuration. Using the latest version OpenLDAP on Centos 5.3. Installed using yum. From my /etc/openldap/slapd.conf database bdb suffix "dc=company,dc=com" rootdn "cn=Manager,dc=company,dc=com" From my /etc/openldap/ldap.conf BASE dc=company,dc=com I have successfully added an entry with ldapadd and retrieved it with ldapsearch from a local bash shell on the box. Now I am trying to get a Graphical Editor to connect to this server remotely so I can enter people from my laptop. But I am having no luck. I tried JXplorer, and it connects with Anonymous bind without me having to specify a BaseDN but I can't edit anything that way. If I try and give it a user name and password, using Manager and my rootpw I have in clear text just for testing, every GUI Client on my remote laptop complains about my BaseDN not being the correct format when I enter dc=company,dc=com and I tried cn=Manager,dc=company,dc=com. Error opening connection: [LDAP: error code 34 - invalid DN] I have tried multiple clients and all of them connect as anonymous, none let me connect authenticated where I can actually create or edit anything. I am using Manager as my username and the password from rootpw, is that correct?

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  • extra managed+unmanaged switches @ home/office -- best (mis)usage scenario? what would you do?

    - by locuse
    up front -- definitely NOT a mission-critical kind of question. after a 'spring cleaning' of my local office, i've ended up with two 'spare' GigE switches at my home/office -- one managed, capable of VLANs, QoS, etc, and the other unmanaged. i've got more ports than i need. in fact EACH switch has more total ports than i need. but, since i can't have these just sitting around not doing SOMETHING ... ;-) i'm interested in ideas for best combined use of these switches. my local topology is simple: [ net ] -- [ adsl2 modem ] -- [linux firewall/router/DNS ] _______________| | [ some arrangement of the 2 GigE switches ] | ( ... stuff on the lan ... ) [WAP1] [voip ATA] [printer] [desktop1] [mail server] [Xen server [desktop2] ( mostly dev, [desktop3] + file server [desktop4] + media server)] the MailServer is a production mail server the XenServer serves some low vol to the 'net; the MediaServer guest serves ONLY to the LAN is there, e.g., any performance value in segmenting off any of the LAN using the managed switch (VLAN? QoS tagging? something?), feeding the rest into the connected unmanaged switch? or should i simply use one of the switches & be done with it, and use the other for a coffee-cup stand?

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  • Xen or KVM? Please help me decide and implement the one which is better

    - by JohnAdams
    I have been doing research for implementing virtualization for a server running 3 guests - two linux based and one windows. After trying my hands on Xenserver, I am impressed with the architecture and wanted to use the opensource XEN, which is when I am hearing a lot more about KVM, about how good it is and it's the future etc. So, could anyone here please help me answer some of my queries, between KVM and XEN. Based on my requirement of three VMs on one server, which is better for performance - KVM or XEN, considering one the linux vm's will works a file-server, one as a mailserver and the third one a Windows server? Is KVM stable? What about upgrades.. What about XEN, I cannot find support for it Ubuntu? Are there any published benchmarks on both Xen and KVM? I cannot seem to find any. If I go with Xen, will it possible to move to KVM later or vice versa? In summary, I am looking for real answers on which one I should use.. Xen or KVM?

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  • Which components should I invest in.. for a backup machine.

    - by Senthil
    I am a freelance developer. I have a PC, a laptop and an old testing and file server machine. I might add one or two in future. I want to have an on-site backup machine that can handle backups of ALL these machines - file backups, MySQL backups, backup of subversion repository, etc.. When building the machine, which components should I invest more in? Examples: The cabinet should have lots of room for expansion. Hard disk size should be large. But I guess hard disk speed need not be high (?) But other components like, RAM, PSU, Processor, Network card, Cooling, etc.. how much relative importance do these have in a backup machine? Which of these components should be high-end or large, and which ones need not be? Some Idea of the load: There will TBs of data. File backups and subversion repository backups will at least be done daily. MySQL backups done weekly. assume 3 machines at the moment and somewhere around 10 machines in the future.

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  • Google Apps routing to different servers, depending on domain

    - by Philip
    We are investigating Google Apps for Education for our group of schools. Currently, each school uses their own Exchange (2003) server. Each school has its own domain which I have added to Google Apps as additional domains. I would like to start transitioning certain staff and some new pupils over to Google Apps to start testing. In this interim phase, I need mail to be routed through Google Apps and then, if no appropriate mail box is found, route on to the individual schools depending on the recipient. I do know that it is possible to route mail that does not have an appropriate Google Apps mail account to a single server - under "Settings / E-mail Settings / General Settings / Routing / E-mail routing". This works well for a single organisation where all the extra mail is destined for one place. I do know that it is possible to set up Routes, under "Settings / E-mail Settings / Hosts" and then use rules, found under "Settigns / E-mail Settings / General Settings / Routing / Receiving Routing". I can then filter based on e-mail domain and forward on to the necessary server. My problem with this, as I understand it, is that it ignores the users that have Google Apps accounts set up and sends all mail to the Exchange server. Are there any solutions for this predicament? Many thanks!

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  • apache/httpd responds slower under EL6.1 than EL5.6 (centos)

    - by daniel
    I've read through other threads on performance differences between RHEL6 and RHEL5, but none seem a tight match to mine. My issue manifests itself in slightly slower average response time (20ms) per request. I have about 10/10 servers of the same hardware spec with Cent6.1 and Cent5.6. The issue is consistent across the group. I am running Ruby on Rails with Passenger. Apache config is identical (checked out from the same SVN repo) Ruby and Passenger are identical builds. Application is identical and being served traffic round robin. mod_worker An interesting clue from server-status: The Cent6.1 servers have a steady 20-40 threads in the "Reading Request" state while the Cent5.6 servers have around 1. I'm graphing this so I can see it trend over time. I also have a bunch of much newer machines that are significantly faster and are running Cent6.1. They dust all the older machines in response time, but I can see they also have a steady 20-40 threads in the "Reading Request" state. This makes me believe I can get their response time down, if I can figure out what is holding up these requests. My gut is telling me that I need to tune some network setting in sysctl, but I haven't figured it out yet. Help is appreciated.

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  • What should I use to ping multiple IPs and get notified of time outs?

    - by HumanVirus
    I've been using MultiPing to ping hundreds of IPs (from access points and such) and check their performance (packet loss, latency) and uptime. The program is very easy to use, but I was wondering if someone could recommend me something that would work better and that would also work in Linux. The features I'm looking for are: Notification Types: At least desktop notifications and SMS, but it would be great if it also had e-mail, IM, or other types of notifications. (MultiPing has some of these, but they don't work too well.) Being notified about the root problem only: Since some devices are dependent on others, I'd like to be notified only about the root problem. E.g. Let's say I have A[x.x.x.222]B[x.x.x.33C[x.x.x.44]D[x.x.x.55], and B goes down, therefore C and D will also be down. Is it possible to get a notification only about B being down? Light on resources. Ideally multiplatform or at least available for both Linux and Windows. I've heard about Nagios and Shinken being used for monitoring. Would you recommend that I use something of the sort or would that be too much for my needs? If using Nagios, Shinken, or similar software is recommended, can anyone tell me what sites I should go to or what books I should get that would be good for someone who is totally new at this? I'd appreciate any suggestions.

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  • Why is "start in" needed for Windows scheduled tasks?

    - by GomoX
    We develop a web application that can be deployed on Windows or Linux. The Linux implementation uses cron, and the Windows one uses scheduled tasks to run a single PHP script that processes all scheduled tasks for our system. The task is scheduled using schtasks during the install process, like: This has always worked both under W2003 and W2008. A week ago a customer reported that scheduled tasks were not running. He is running on Windows 2008. We checked over and over and finally solved the issue by entering the folder that contains the .vbs script as the "start in" folder for the scheduled task. This said, there is no way to set up the "start in..." value from schtasks without using an XML definition of the tasks. XML definitions don't work in Windows 2003, so I would have to add windows version detection to the installer, additional testing, etc (I'd like to avoid this if at all possible). The only atypical thing I noticed about the install is that the system is installed in D:\ as opposed to the default C:\Program Files (x86)\, but I don't see how this would matter. All the paths are absolute in all the scripts. Can anyone suggest a reasonable solution for this?

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  • Change the logical name of sql server express 2005 database file?

    - by oob
    In Microsoft SQL Server Management Studio Express for Sql Server Express 2005, I needed to copy a database for testing and keep it on the same server as the old database. I did the following: Right Click on Databases Created new database Detached the database I wanted to copy "Restored" my new database from the backup file of my old database. I did this by clicking the 'Overwrite the existing database' box on the Options pane, and I changed the paths in the 'restore as' options so that they pointed to my new .mdf and .ldf files. Everything is working like I want. Problem is, when I right-click - Properties - Files on my new database, the logical name of the .mdf file is the same as the logical name of the old .mdf file. They are actually different files - they just share the same logical name? I guess maybe this isn't a short-term problem, but I can see it confusing somebody down the road. Any way to change the logical name of the .mdf file? UPDATE EDIT - Apparently you can just change the logical name through the GUI by, get this, clicking on it and typing a new name. I could swear that was not possible when I posted this, but maybe it was and I somehow missed it! Either way - the solution below should still work but doing it through the GUI is also an option.

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  • Good Hosting Providers With Zend Framework Support [closed]

    - by manyxcxi
    I currently use ixwebhosting for my hosting services. They're cheap and work (most of the time). The databases are horribly slow, the servers are horribly slow, and their support (though usually prompt) is tough to deal with. That being said, they're cheap, I've got like 20 domains hosted in my account, none of them are high volume, and they work JUST good enough- until today. This isn't meant to be a condemnation of ixwh though. Their prices are very low for what they do offer and most things work just fine, most of the time. I need to be able to host web apps written with Zend Framework in a fairly easy fashion. The server performance can't be worse than what I've already had (a pretty low hurdle to clear), and I don't want to spend $30/mo. These are not money making websites- they're projects. My requirements are PHP 5.3, ZF support, MySQL databases, multiple domains- not much. Who should I look at, and who should I look out for?

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  • What is making iTunes stop playing when my computer idles?

    - by OwenP
    I've got a rare weekend with nothing to do, so I'm getting some housework done. I have iTunes playing for some background noise. Every 20 minutes or so, it just stops playing; if I move the mouse it starts again. I'm on Windows 7 64-bit. My power settings have my monitor turning off at 10 minutes and hard drives at 20. Both sleep and hibernate are disabled. "Aha!", you say, "Clearly when the hard drive is turned off iTunes is stopping!" Not so. I fiddled with the settings and changed them to make the hard drive sleep in 5 minutes, and iTunes kept playing for the 7 minutes I watched it. I'm currently trying to see what happens if I set the hard drive to never turn off, but I'd prefer to leave it at 20 minutes to save minor amounts of energy. (Edit: I just set it to 240 minutes, and it stopped at 20 minutes. It seems tied to when the monitor turns off; that seems odd and I'm testing that now.) What other settings could be the culprit?

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  • ImageMagick installation confusion

    - by Codemonkey
    Well this is turning out to be a pain. I'm on CentOS 6.5. I saw on the PECL ImageMagick changelog that they added a load of constants for new filters, such as LANCZOS2SHARP. Some testing I did earlier suggested that PhotoShop 6.5 was able to downsize photos with better clarity than my current ImageMagick's best effort of LANCZOS, so I thought I'd try to upgrade to test out the newer filters. So, first port of call - get source from pecl for 3.2.0RC1. Installed with no problems. But, ah-ha. Although it says it only requires IM 6.2.4, the filters I'm after don't work unless you have 6.6.6+ So I go http://www.imagemagick.org/script/install-source.php to install the newest version. This is the bit that's puzzled me. It all appears to have installed fined. The tests work fine, passing 40 out of 40. If I run identify -version on the command line it outputs 6.8.9 But if I echo Imagick::getVersion() in PHP it shows 6.5.4, even after restarting php-fpm. rpm -qa | grep ImageMagick shows that I still have 6.5.4 installed locate ImageMagic also only seems to show the 6.5.4 one I feel that the missing link here is ImageMagick-devel, do I need to install that too? How do I go about doing that? Or do I just need to reinstall the pecl-imagemagick 3.2.0RC1 now that I have the latest IM installed?

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  • VPN with VLANs? [closed]

    - by Craig
    As usual, I'm sure I'm in way over my head on this one. My networking skills are limited; so, bear with me if you will. What I have are a few testing servers at my house as well as at a friends house that I want to link together so they can see each other (VPN right? I've done those before). We want to be able to see all the servers and work with them from either location. All the servers also need to be able to see each other. But, we don't want to see each others PCs, printers, PS3s etc. How do we pull that trick off? Multiple VLAN?... subnets?... what? If hardware matters, I have an old PC I was planning on loading pfSense onto because my current el-cheapo router doesn't support VPN. The VPN linking the houses is about the only thing I'm sure on. Beyond that, I'm lost. I'm not a complete noob; but, like I said, I'm not so sharp with the more complex networking. I do however read well... So use lots of descriptive words and feel free to link away to long dry articles if necessary. :-)

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  • How many guesses per second are possible against an encrypted disk? [closed]

    - by HappyDeveloper
    I understand that guesses per second depends on the hardware and the encryption algorithm, so I don't expect an absolute number as answer. For example, with an average machine you can make a lot (thousands?) of guesses per second for a hash created with a single md5 round, because md5 is fast, making brute force and dictionary attacks a real danger for most passwords. But if instead you use bcrypt with enough rounds, you can slow the attack down to 1 guess per second, for example. 1) So how does disk encryption usually work? This is how I imagine it, tell me if it is close to reality: When I enter the passphrase, it is hashed with a slow algorithm to generate a key (always the same?). Because this is slow, brute force is not a good approach to break it. Then, with the generated key, the disk is unencrypted on the fly very fast, so there is not a significant performance lose. 2) How can I test this with my own machine? I want to calculate the guesses per second my machine can make. 3) How many guesses per second are possible against an encrypted disk with the fastest PC ever so far?

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  • Can anyone help me make my reverse proxy actually cache?

    - by Lenary
    Hi folks, I'm trying to configure a Reverse Caching Proxy but so far have had no luck. I would preferrably like to use apache (that will be all it will be used for), but am open to solutions using other software that can also run on Mac OS X 10.6 (I have also tried using Varnish and Squid, but with no more luck). We're running a system with about 80 mac mini clients that will be requesting lots of video from a server. To reduce load, we thought we could use Apache (which comes on the macs by default) to cache this video forever (or at least as long as possible) onto the macs' disks. I have managed to get a reverse proxy set up with apache using ProxyPass etc, but when i tried to add CacheEnable disk / to the configuration, nothing happened (i do have mod_disk_cache included). Can anyone help with my issue? The apache config file is here Thanks in advance Edit: So far I have been testing it with smaller text files, and it hasn't been caching properly. This suggests it is nothing to do with us actually downloading video, but actually to do with the cache configuration.

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  • pgpool2+streaming replication failover on only 2 servers?

    - by aneez
    I am trying to configure pgpool2 and postgresql 9.1 to handle failover. I currently have streaming replication running, and are using pgpool2 for read-only load balancing. I have 2 servers in my setup, both running postgresql - 1 master and 1 slave. The master is also running pgpool2. My question is how do I configure this setup to handle failover? Specifically in the case that the master crashes, and the slave has to take over and run pgpool2 as well. Most documentation and examples I have been able to find assumes that pgpool2 is running on a separate server and thus "never" crashes. I may or may not be attacking the problem using the wrong tools. In my production setup I have a total of 3 identical servers all in independent locations. The main goal of the setup is to achieve a high uptime. Thus failover should be automatic, and bringing a failed node back up should cause only minimal downtime. I want all 3 nodes to be as close to identical as possible, and be able to run with just 1 or 2 nodes available. And if possible I want to use load balancing to improve performance. If anyone can help me gain some insight into how to do this using my current setup or suggest a different/better setup. Thank you!

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  • Determining how all memory is used in Windows Server 2008

    - by Mojah
    Hi, I have a Windows Server 2008 system, which has 12GB of RAM. If I list all processes in the Task Manager, and SUM() the memory of each process (Working Set, Memory (Private Working Set), Commit Size, ...), I never reach more than 4-5GB that should be "in use". However, task manager reports this server has 11GB in use via the "Performance" tab. I'm failing in determining where all that used RAM is going. It doesn't seem to be system cache, but I can not be sure. It might be a memory leak in one of the appliances, but I'm struggling to find out which one. The server's memory keeps filing up, and eventually forces us to reboot the device to clear it. I've been reading up on how RAM assignments work on Windows Server: RAM, Virtual Memory, Pagefile and all that stuff: http://support.microsoft.com/kb/2267427 What's the best way to measure? http://www.zdnet.com/blog/bott/windows-7-memory-usage-whats-the-best-way-to-measure/1786 Configure the file system cache in Windows: http://smallvoid.com/article/winnt-system-cache.html But I fear I'm stuck without ideas at the moment.

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  • Migrate active directory to Google apps for business

    - by dewnix
    I've got a problem migrating active directory to Gapps. I'm stuck on google apps directory sync (GADS) where it just gives the error "java.lang.NullPointerException" after testing the connection during the LDAP configuration step. I checked the logs and I've pretty much determined that port 389 (standard LDAP port) isn't listening on the exchange server. I've tried telneting to it (from another machine in the same network) with no luck but I can telnet to other ports, that i know are open, successfully. I know they're open because I used portqry and netstat to see them. I'm suspecting that the active directory isn't even installed/running on this machine because there's no active directory services at all running on it. There's no active directory services that say they're NOT running either though. Is it possible AD is installed somewhere else? does it have to be on a machine inside the same network? I found the domain controller and it's host name and when I telnet with port 389, it works however GADS still gives me the same exact error when I substitute that server in. Actually, no matter what ridiculous settings i put into GADS, i still get that same NullPointer error. If i could get some different error than that NullPointer, i'd call that a successful day.

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  • Windows Server 2008 Alerting to Low memory

    - by t1nt1n
    I have a file and print server running on Windows 2008 R2 fully patched in a VSphere environment (ESXi 5.1 fully updated). Every evening between 19:20 and 19:30 our monitoring software reported that the available memory is 1% and performance is dire. There is nothing in the event logs to point to an issue. At this point in the evening I am general the only user on the system to check to see why these alerts are going off. Things I have done; Checked to see if any backups are running – None at all. Checked Scheduled tasks – None before or during this time period. Moved the VM to another host. AV is disabled to rule out that as the issue. The server does not have any problems during the day with memory when fully loaded with about 50 users. The server did have 4GB ram provisioned but I have increased this to 5Gb. Running PrefMon at the time (I will save the graphs tonight) There very little CPU usage at the time but RAM usage goes up.

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  • Identifying test machines in analytics logs

    - by RTigger
    We're just beginning to add analytics to our SaaS application, to begin (among other things) billing clients based on usage. The problem we're running into is there's a few circumstances where our support team will simulate a log in into production to try to reproduce reported issues with a client's configuration. When they log in, an entry will be made into our analytics logs that their specific account has logged in, which we use to calculate billing. A few ideas we had to solve this: 1) We log IP addresses as well as machine keys for each PC that logs in - we could filter out known IP addresses and/or machine keys belonging to support. The drawback is we have to maintain a list of keys / addresses manually. 2) If support (or anyone else internal) runs our application in debug mode (as opposed to release), it will not report analytics. This is fine, as long as support / anyone else remembers to switch to debug mode. 3) Include some sort of reg key / similar setting required to be set when configuring a production system in order to send analytics. Again, fine, as long as our infrastructure team remembers to set the reg key or setting. All of these approaches require some sort of human involvement, which we all know can be iffy at best. Has anyone run into a similar situation? Is there an automated approach to this problem? (PS Of course, we shouldn't be testing in production, but there are a few one-off instances with customer set up that we can't reproduce without logging in as them in production. This is the only time we do so, and this is the case I'm talking about in this question.)

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  • Determining how all memory is used in Windows Server 2008

    - by Mojah
    I have a Windows Server 2008 system, which has 12GB of RAM. If I list all processes in the Task Manager, and SUM() the memory of each process (Working Set, Memory (Private Working Set), Commit Size, ...), I never reach more than 4-5GB that should be "in use". However, task manager reports this server has 11GB in use via the "Performance" tab. I'm failing in determining where all that used RAM is going. It doesn't seem to be system cache, but I can not be sure. It might be a memory leak in one of the appliances, but I'm struggling to find out which one. The server's memory keeps filing up, and eventually forces us to reboot the device to clear it. I've been reading up on how RAM assignments work on Windows Server: RAM, Virtual Memory, Pagefile and all that stuff: http://support.microsoft.com/kb/2267427 What's the best way to measure? http://www.zdnet.com/blog/bott/windows-7-memory-usage-whats-the-best-way-to-measure/1786 Configure the file system cache in Windows: http://smallvoid.com/article/winnt-system-cache.html But I fear I'm stuck without ideas at the moment.

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  • Using Openfire for distributed XMPP-based video-chat

    - by Yitzhak
    I have been tasked with setting up a distributed video-chat system built on XMPP. Currently my setup looks like this: Openfire (XMPP server) + JingleNodes plugin for video chat OpenLDAP (LDAP server) for storing user information and allowing directory queries Kerberos server for authentication and passwords In testing with one set of machines (i.e. only three), everything works as expected: I can log in to Openfire and it looks up the user information in the OpenLDAP database, which in turn authenticates my user with Kerberos. Now, I want to have several clusters, so that there is a cluster on each continent. A typical cluster will probably contain 2-5 servers. Users logging in will be directed to the closest cluster based on geographical location. Something that concerns me particularly is the dynamic maintenance of contact lists. If a user is using a machine in Asia, for example, how would contact lists be updated around the world to reflect the current server he is using? How would that work with LDAP? Specific questions: How do I direct users based on geographical location? What is the best architecture for a cluster? -- would all traffic need to come into a load-balancer on each one, for example? How do I manage the update of contact lists across all these servers? In general, how do I go about setting this up? What are the pitfalls in doing this? I am inexperienced in this area, so any advice and suggestions would be appreciated.

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