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• Managing an application across multiple servers, or PXE vs cfEngine/Chef/Puppet

  - by matt

  We have an application that is running on a few (5 or so and will grow) boxes. The hardware is identical in all the machines, and ideally the software would be as well. I have been managing them by hand up until now, and don't want to anymore (static ip addresses, disabling all necessary services, installing required packages...) . Can anyone balance the pros and cons of the following options, or suggest something more intelligent? 1: Individually install centos on all the boxes and manage the configs with chef/cfengine/puppet. This would be good, as I have wanted an excuse to learn to use one of applications, but I don't know if this is actually the best solution. 2: Make one box perfect and image it. Serve the image over PXE and whenever I want to make modifications, I can just reboot the boxes from a new image. How do cluster guys normally handle things like having mac addresses in the /etc/sysconfig/network-scripts/ifcfg* files? We use infiniband as well, and it also refuses to start if the hwaddr is wrong. Can these be correctly generated at boot? I'm leaning towards the PXE solution, but I think monitoring with munin or nagios will be a little more complicated with this. Anyone have experience with this type of problem? All the servers have SSDs in them and are fast and powerful. Thanks, matt.

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• RAID 10: SPAN 2 vs SPAN 4

  - by LaDante Riley

  I am currently configuring RAID 10 (first time doing RAID ever) for a server at work. In the Configuration Utility. I am given the option of either span 2 or span 4. Having never done this before, I was curious if someone could tell me the pros and cons of for each span? Thanks The server is a Poweredge r620 with a PERC H710 mini (Security Capable) RAID controller. I have 8 600GB hard drives. I am creating this server as a network storage drive. I have SQL server historian database whose 1TB storage filled up and after 5 years of logging data.

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• Apache mod_proxy vs mod_rewrite

  - by Scott

  What is the difference between using mod_proxy and mod_rewrite? I have a requirement to send certain url patterns through the tomcat, which runs on the same host but under port 8080. I know this is something for mod_proxy, but I"m wondering why I can't just use mod_rewrite, or what the difference is? Probably has to do w/ reverse proxy, and also when in the pipeline it gets handled? Thanks.

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• CDN vs own apache servers?

  - by ajsie

  i know that CDN is just for static contents. but then i still have to spread out by apache servers to all corners of the world right? so when i have done it, why dont i just set up some dedicated apache servers only serving static content just like CDN? are there real benefits from still using CDN compared to that scenario?

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• Advantages of a 130W vs 90W ac adapter?

  - by David

  I purchased a Lenovo T420S laptop with a 90W/20V AC adapter P/N 42t4426 through my IT department. Subsequently, I ordered a replacement adapter and received a 135W/20V AC adapter P/N 45N0054. The 135W version is about twice as big and heavy as the 90W version. Is there an advantage to the 135W version like faster battery recharging? Are there any negative effects (other than weight), like reduced battery life?

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• NAT vs public IP (and blocked ports)

  - by user1646166

  I have a problem with my ISP. They say that they don't block any ports and I have public IP, while I think these both statements are false. Before I talk to them again (which is really tough when my understanding of these terms is different than theirs) I would like to make some things clear. It seems like my computer is behind NAT (is it possible to have public IP and be behind NAT at the same moment?). When I check my IP, through some external server, and type that IP into browser I get a home page of some router (not mine). Isn't that a proof that my IP isn't public? Also, I have problems with making connections via some ports. E.g. when I'm trying to connect through some high port ( 1023) via SSH, it doesn't work. Is it possible that certain range of outgoing ports from my computer are blocked? Or is it simply because that my ssh client (PuTTY) can't receive incoming packets because of blocked incoming ports? To avoid some questions: it's not a problem with my router, I tried connecting my PC directly and it also didn't work, while having connected by 3G using phone with USB tethering, it does work. Thanks!

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• svchost.exe @ 100% disk utilization vs. Outlook.ost

  - by Aszurom

  Vista x32 box with Outlook 2007. Outlook is not running. Hasn't been fired up for several reboots. I stopped WMI service and Windows Search service. Machine is mostly quiet, and then servicehost.exe launches an instance and starts banging away at Outlook.ost file. I can't determine what is causing it. I'm watching it in processmon, and trying to investigate it with preocessexplorer. Not having much luck at figuring out why the machine is so interested in that file. NOTHING is running that should be touching it.

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• AWS VPC ELB vs. Custom Load Balancing

  - by CP510

  So I'm wondering if this is a good idea. I have a Amazon AWS VPC setup with a public and private subnets. So I all ready get the Internet Gateway and NAT. I was going to setup all my web servers (Apache2 isntances) and DB servers in the private subnet and use a Load Balancer/Reverse Proxy to pick up requests and send them into the private subnets cluster of servers. My question then, is Amazons ELB's a good use for these, or is it better to setup my own custom instance to handle the public requests and run them through the NAT using nginx or pound? I like the second option just for the sake of having a instance I can log into and check. As well as taking advantage of caching and fail2ban ddos prevention, as well as possibly using fail safes to redirect traffic. But I have no experience with their ELB's, so I thought I'd ask your opinions. Also, if you guys have an opinion on this as well, would using the second option allow me to only have 1 public IP address and be able to route SSH connections through port numbers to respective instances? Thanks in advance!

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• Harvard vs. Von Neumann architecture

  - by user32569

  Hi. Our teacher told us, that Harvard architecture is the most evolved and produced architecture today and towards future. but I thing becouse os massive averhead of x86 and Von Neumann nased ARM systems that actually Von Neumann is the most used architecture today. Yes, MCUs with Harvard are even more produced, but since they all have just minor purpose (compared to x86 and ARM based) that Von Neumann is actually the one. Or is it really Harvard? And second, I know this is strange question, but does any architecture combining both exists? to have separate memory for data and programs, therefore faster instruction processing, but still able to work with these as Von Neumann? To be able o load amd unload programs to program memory on the fly? Isnt this the way the x86 should have go? Or would there be some bottleneck that pure Von neumann solves? Thanks.

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• Routing protocols, distance vector vs link state

  - by Artem Barger

  I'm trying to figure out the differences(pros/cons) between two routing protocols approach and I would be great-full for any help, advice and explanation. As far I can say that it seems like distance vector is more static and more local based routing, since it doesn't know the network state whereas link state is more aware of current states therefore it seems more natural to use it over distance-vector, but I have a feeling like I'm missing something. And I would be glad to here about more aspects and different issues I have to consider while choosing one of them.

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• Cisco Nexus 5000 Vs. UCS 6100

  - by radius

  Hello, I'm a bit lost when I take a look to Nexus 5000 and UCS 6100. The description of Nexus 5000 is quite clear and I see what it does but the description of the UCS 6100 is a bit unclear for me. Could someone told me what would be the difference between a Nexus 5000 with all port at 10G and an UCS 6100 with all port at 10G ? Thanks,

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• UPS vs Solar Power in case of power failure for a server [on hold]

  - by Zen 8000k

  I am looking for a low power, low end pc able to run 24/7 without overheating and a way to support it in case of power failure. Power failures can be up to 72 hours. The pc dosen't need a monitor or keyboard. A modem must also be protected in case of power failure. When i say low end, i don't mean crap. The cpu needs to be x86 and have at least 1k cpu in this chart: http://www.cpubenchmark.net/index.php What's the best way to do this? EDIT: more info. I need to run a home server. The server will perform light tasks mainly. A x86 cpu sadly is the only route for my use. I want to be able to run the server and the router/modem in case of power failure. Now, regarding how long the power will fail: 1) 1 hours is OK for most situations. (say 90%) 2) 3 hours is OK (say 98%) 3) 6 hours is more thank OK. (say 99.5%) 4) On extreme cases the power might fail days. I believe this is very unlikely to happen. More is great but, really, how ofter power will fail more than 3 hours? I believe once every year at best. Well, that's too rare to care about. Given the above, I am looking for a cost effective way to archive 1-3 hour power or 6 hour if possible. Solutions: You guys give me great ideas. 1) Power generator: no good as power will fail for 10 seconds before returning. Also I read online, "clean" power generators cost 1.5k+, so it's out of budged. Non clean generator might damage electronics, right? 2) Solar power: i don't know for sure about this. Sounds like a great idea, too good to be true, honestly. For only 200$ i get 100+w? What are the drawbacks here? 3) UPS: This seems to be the best. The only problem is the cost. Cost < 200$ = great 400$ = budged limit

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• nginx www.domain.com vs domain.com virtualhost

  - by m33lky

  I have an http block where I include virtual hosts for the different domains hosted on the same server. For each virtual host I do: listen domain.com:80; Now, domain2.com works fine. However, when I do www.domain2.com it shows the page for domain1.com! How to properly configure nginx? Does this have something to do whether www is a CNAME or an A record? Update: It looks like you can do the following: listen 80; server_name domain.com www.domain.com;

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• 1Gigabit vs 1.25Gibabit mismatch

  - by Joel Coel

  I need to re-connect the network to a small old outbuilding that hasn't been used in several years. I have to use the existing 62.5um multi-mode fiber run. This end of the fiber is already connected. For the end in the building, I was looking at this pair: http://www.tp-link.com/products/productDetails.asp?class=switch&content=spe&pmodel=TL-SM311LM http://www.tp-link.com/products/productDetails.asp?class=&content=spe&pmodel=TL-SL2210WEB If you look at the sfp first (first link), it's listed at 1.25Gpbs. That's odd, because IIRC the fiber should really only do 1Gbps. It's also supposed to work with the switch I posted (2nd link), but the gbic port on the switch also only shows 1Gbps. What am I missing here?

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• SpeedTracer NETWORK_RESOURCE_RESPONSE vs NETWORK_RESOURCE_FINISH

  - by Ben Flynn

  I'm using SpeedTracer with GoogleChrome to measure the load times of requested resources. The SpeedTracer site says: NETWORK_RESOURCE_RESPONSE "Indicates that the renderer has started receiving bits from the resource loader" NETWORK_RESOURCE_FINISH "Indictes a resource load is successful and complete." In my mind that means we would always see a network resource response (bytes are arriving) before we see a finish (all bytes received). This doesn't seem to be the case at all. Here is a sample: Request Timing @33519ms for 926ms Response Timing @34445ms for -847ms Total Timing @33519ms for 78ms I'm guessing response time isn't supposed to be negative. Can someone explain this or is this a bug? I'm using Chrome 10.0.612.3 dev with a SpeedTracer I downloaded today.

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• Adding a second IP address for IIS - static vs dynamic A records

  - by serialhobbyist

  I'm looking to add a second IP address to IIS so that I can run two sites with different SSL certificates. When I added one on my play box and ran ipconfig /registerdns both addresses were registered in DNS with the server's name. So, I deleted the A record for the new IP address and rebooted. That also registered both names. So, then I went into the network config for the adapter and, on the DNS tab, unchecked "Register this connection's addresses in DNS". I deleted the A record for the new IP address again and re-ran ipconfig /registerdns. This time, it deleted the A record for the old IP address and didn't created one for the new address. Neither of these is what I want: I want the main IP address to be registered and refreshed automatically as a dynamic DNS record and the second IP address to be registered and managed as a static address. Is there any way to achieve this?

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• wireless repeater vs wireless bridge?

  - by Kossel

  Scenario: I have a ADSL modem inside the studio which is connected with some wired/wireless devices. but when I'm in the backyard with my laptop the wireless signal is very poor, so the connection is very unstable. I have an old belkin wireless router and I read that it can be useful in this scenario. after some search, it's compatible with DD-WRT, and seems setting it both wireless repeater or wireless bridge can do the job. but which is better for speed and stability or for my purpose they are the same? wireless repeater wireless bridge

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• Self-healing Cloud vs Failover Boxes

  - by IMB

  Now that self-healing cloud servers are becoming more and more popular, I am currently torn between the decision if I should setup a HAproxy failover for my VPS or if should save myself the trouble and just put my sites on a self-healing cloud server. Does it still make sense to setup your own failover system (HAproxy + 2 or more servers for example) when self healing cloud seems like a practical solution? They seem to do the same job or am I missing something?

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• Data Archiving vs not

  - by Recursion

  For the sake of data integrity, is it wiser to archive your files or just leave them unarchived. No compression is being used. My thinking is that if you leave your files unarchived, if there is some form of corruption it will only hurt a smaller number of files. Though if you archive, lets say all of your documents, if there is even the slightest corruption, the entire archive is unrecoverable. So whats the best way to keep a clean file system, but not be subject to data corruption.

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• OPTIONS request vs GET in Ajax

  - by user41172

  I have a PHP/javascript app that queries and returns info using an ajax request. On every server I've used so far, this works as expected, passing an Ajax GET request to the server and returning json data. On a new install, the query fails and returns nothing-- I inspected the request and it turns out that rather than passing the query as a GET, the server is passing it as an OPTIONS request. Is there any reason for this? I have no idea why this might happen. THanks!

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• dd vs. secure-erase for reconditiong SSDs

  - by DrStalker

  Does writing zeros to an entire ssd (dd if=/dev/zero of/dev/sdX) give the same performance restoring effect that you get from a "secure erase", or does secure erase do something else as well?

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• Internet Troubles - PPPoE vs PPPoA?

  - by AkkA

  I have been having some internet troubles at home (ADSL2+ connection in Australia). We get random drop-outs from the authentication connection. It will keep the connection to the DSL service, but we lose authentication and either have to restart the router/modem (its combined, a Belkin one, not sure on model number) or unplug the phone cable, wait about 30 seconds and plug it in again. I've called the ISP (Telstra) a few times, but they only offer limited support when we dont use their supported hardware. Apparently something had happened on their side, they checked the box again (at least it sounded that simple), and told me it would be fine. It wasnt. I've replaced all the filters around the house, but that didnt help either. We do live a little bit away from the exchange (get a sync speed of about 3000/900), so I thought it could be due to line noise but that hasnt helped. Telstra allow both PPPoE and PPPoA connections (which I'm configuring through my router, dont have software on the PC side). I've been running PPPoA the whole time, would it make any difference changing it to PPPoE? If not, are there any other theories as to why we would be experiencing these drop-outs? It has been fine for at least 12 months, then suddenly started about 2 months ago.

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• Renting an "EC2" server VS buying one (for a start up in initial stages)

  - by krish p

  We are a small start up in the early stages and are working on a SaaS-based Rails product. Currently, we use EC2 for a small instance and have a need for another large/extra-large instance as we are beginning to deploy to the Cloud and get ready to release our "alpha" version. While EC2 was my choice for numerous reasons (reliability, accessibility - small team is geographically dispersed, maintainability, and things of that nature), it appears to be rather expensive. While the product will ultimately be deployed in the Cloud (be it EC2 or otherwise) and that experience would help the development team, would it make sense to purchase a physical server and stick it in the basement or bite the bullet and pay the price for EC2 (or other Cloud Providers)? While such decisions are driven by numerous factors, it would certainly help to get the thoughts of other folks who may have been in similar situations. Hence, the post. Thanks much!

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• OpenVZ vs KVM for Linux VMs

  - by Eliasdx

  Hardware: Intel® Core™ i7-920, 12 GB DDR3 RAM, 2 x 1500 GB SATA-II HDD (no SoftRaid because Proxmox developers don't support softraid and they are sure you'll run into problems) Software: Proxmox VE with KVM and OpenVZ support and debian everywhere I want to run multiple Linux VMs on this server. One for a firewall (I want to try pfSense), one for MySQL, one VM for nginx (my stuff) and ~2 VMs with nginx for other people's web sites. I don't think that pfSense will run in an OpenVZ environment but it should run in KVM. The question is if I should setup the other VMs using KVM or OpenVZ. In OpenVZ they should have less overhead for the OS itself but I don't know about the performance. I heard that KVM is more stable but needs more RAM and CPU. I found this diagram showing a OpenVZ setup on the same hardware I'm using. This guy uses an own VM for each and every website which is running on his server. I can't think of any advantage why he's using so many VMs.

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• Mac OS: "Minimize" vs "Hide" - what's the difference?

  - by pix0r

  Why does OS X have both a "Hide" and a "Minimize" feature? This seems somewhat redundant to me, and also introduces some inconsistency when I am trying to find an arbitrary window. If it's hidden, I need to activate the application and use the "Windows" menu to bring it up; if the window is minimized, it appears in the dock. What are some scenarios in which you'd use these two features differently?

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