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• cpio VS tar and cp

  - by Tim

  I just learned that cpio has three modes: copy-out, copy-in and pass-through. I was wondering what are the advantages and disadvantages of cpio under copy-out and copy-in modes over tar. When is it better to use cpio and when to use tar? Similar question for cpio under pass-through mode versus cp. Thanks and regards!

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• JBOSS App Server vs. Glassfish

  - by codingbear

  I'm quite newbie on Glassfish. What are some differences between JBoss and Glassfish? Why would you chooose one over the other. I'm trying to read up on Glassfish, but it is really hard to pinpoint things that I may need before I start installing and trying to deploy some applications on it. UPDATE It would be good if any additional information on JBoss and Glassfish comparison is provided (e.g. technologies they support, performance, etc.)

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• xinet vs iptables for port forwarding performance

  - by jamie.mccrindle

  I have a requirement to run a Java based web server on port 80. The options are: Web proxy (apache, nginx etc.) xinet iptables setuid The baseline would be running the app using setuid but I'd prefer not to for security reasons. Apache is too slow and nginx doesn't support keep-alives so new connections are made for every proxied request. xinet is easy to set up but creates a new process for every request which I've seen cause problems in a high performance environment. The last option is port forwarding with iptables but I have no experience of how fast it is. Of course, the ideal solution would be to do this on a dedicated hardware firewall / load balancer but that's not an option at present.

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• auto-summarization: classful vs classless routing protocols

  - by yorble

  Suppose a router R1 is directly connected to the following subnets: 10.1.0.0/24 10.1.1.0/24 10.1.2.0/24 10.1.3.0/24 If it is running RIPv1, it will advertise: "i have the network 10.0.0.0" (implicitly understood by receiving RIPv1 routers as 10.0.0.0/8 because the protocol is classful) but suppose we changed the routing protocol to RIPv2 and turned ON auto-summarization. Would it behave in the same way? Would it advertise: "i have the network 10.0.0.0" (advertised WITHOUT subnet mask, and implicitly understood by other routers as 10.0.0.0/8) OR would it auto-summarize in a non classful way like: "i have 10.1.0.0/22" (advertised as network id and subnet mask pair) In other words, does turning on auto-summarization in RIPv2 (or other classless routing protocols) cause it to auto-summarize in a classful manner or simply auto-summarize classlessly to the best of its ability?

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• How to configure Apache (sites-available vs httpd.conf)

  - by Edan Maor

  Hi, I'm brand new to Apache so this might be a stupid question. I've been trying to follow a few basic tutorials explaining how to get Apache up and running (on ubuntu, running on Amazon). I've mostly come up blank, because all the tutorials told me to configure httpd.conf (to add DocumentRoot, etc.). I've now stumbled across one tutorial that told me to add site configurations to the sites-available directory (under /etc/apache), and then symlink to it from sites-enabled. Configuring this way seems to work. But now I'm confused - how am I supposed to configure Apache? Most tutorials still seem to say that I should be using httpd.conf. Which one should I be using? What's the difference? Why are all the tutorials "wrong" (if they are)? Thanks!

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• EFI vs MBR - Installing Windows Server 2008 R2 or 2012 on 8TB

  - by Riaan de Lange

  I'm having some difficulty installing Windows Server 2008 R2 and Windows Server 2012 on an Intel Server platform. The server specs is as follows: Intel Grizzly Pass Server System - R2308GZ4GC 2x Intel Xeon 2620 - 2.0 GHZ - BX80621E52620 132 GB of Memory REG-DIMM - TS1GKR72V6H 4x Seagate Constellation ES 2TB 3.5" 7200rpm 6GB/S - ST32000645NS Intel Big Laurel 4CH 6G SAS RAID 512MB - RS2BL040 On the Intel RAID Controller Setup, I have setup the HDD to be in RAID-0 - for testing purposes. (Ultimately configured in RAID-5) So, the total size of HDD space I can use is 7.6 TB something... When I install the Server OS's, they don't seem to go beyond 2 TB (1.76 TB) I have read up on EFI and UEFI boot, and this seems to work in 2012, but I could not install any drivers for the motherboard... So, I also tried EFI for 2008R2, and this worked while installing the OS, it did not however work with the Windows Boot Manager option in the BIOS. It kept on freezing once it tries to load the partition. My idea was to allocate the complete 8 TB for the OS, and load a few VM's on there. I have now started with a new approach where I'll have a 256 GB OS Partition, and a secondary 7.5 TB Data partition. Oh, and I also did a diskpart - convert disk to gpt whilst installing 2008R2. The whole disk was accessible, 7.6TB Can anyone please clarify that EFI/UEFI is meant for larger boot volumes? Bigger than 2TB. If I were to have an ideal situation where my OS is run on a SSD, 256GB, and I can attach the 8 TB drives as normal disk to the OS? I'm I correct in saying that if I wanted to boot from a 8TB partition, I would need to force the BIOS to boot from EFI? The limit for MBR is 2 TB as far as I know now... *FYI: The motherboard is EFI-ready

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• vmware vs normal server

  - by zachary

  what is a good benchmark for me to run on my old server and my new vmware server? I want to verify that I have not lost any performance between the two

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• Co-location vs. cloud hosting

  - by RainyRat

  We have a decent-sized server estate: several ProLiants, plus IBM BladeCentre and SANs running a VMWare environment. Due to an imminent premises move, we're not going to have enough space for a server room, so I've been looking at moving everything out to a colo. My boss is more keen on the idea of cloud-hosting everything, which would include a couple of high-traffic websites (about 9m pageviews/month), our Exchange sever (about a million clean emails sent/received monthly), as well as file/print/AD/all the ususal stuff. This doesn;t sound like a good idea to me, but I'm new to the ways of the cloud. Can anyone offer any advice?

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• Running virtual machines: Linux vs Windows 7

  - by vikp

  Hi, I have tried running windows xp development virtual machine under windows 7 and the performance was dreadful. I'm considering installing Linux and running the virtual machine from the Linux, but I'm not sure whether I can expect any performance gains? It's a 2.4ghz core 2 duo machine with 4gb ram and 5400 rpm hdd. Can somebody please recommend very cut down version of linux that can run VMWare player and isn't resource hungry? Thank you

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• Why does bash invocation differ on AIX when using telnet vs ssh

  - by Philbert

  I am using an AIX 5.3 server with a .bashrc file set up to echo "Executing bashrc." When I log in to the server using ssh and run: bash -c ls I get: Executing bashrc . .. etc.... However, when I log in with telnet as the same user and run the same command I get: . .. etc.... Clearly in the telnet case, the .bashrc was not invoked. As near as I can tell this is the correct behaviour given that the shell is non-interactive in both cases (it is invoked with -c). However, the ssh case seems to be invoking the shell as interactive. It does not appear to be invoking the .profile, so it is not creating a login shell. I cannot see anything obviously different between the environments in the two cases. What could be causing the difference in bash behaviour?

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• AMD chipset VS SLi

  - by djechelon

  Hello, I currently own a Crosshair 2 Formula which is broken and I need to replace. Recently, I bought a Phenom 2 CPU which I wouldn't like to throw away. Recent Crosshairs are based (as opposed to the Rampage series) on chipsets that are certified for AMD Crossfire. The problem is that I have 3 SLi cards I absolutely don't want to change with AMD card(s) since I use 3D Vision, and I need NVidia. If I buy a Crosshair 3 or 4 which is not SLi certified, will SLi still work? Else, could you suggest me a good gaming motherboard with AM3 socket and that works with 3-way SLi? Thank you in advance. [Edit] I'm asking this question because it seems Crosshair 2 is difficult to find among the market

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• If-Modified-Since vs If-None-Match

  - by Roger

  This question is based on this article response header HTTP/1.1 200 OK Last-Modified: Tue, 12 Dec 2006 03:03:59 GMT ETag: "10c24bc-4ab-457e1c1f" Content-Length: 12195 request header GET /i/yahoo.gif HTTP/1.1 Host: us.yimg.com If-Modified-Since: Tue, 12 Dec 2006 03:03:59 GMT If-None-Match: "10c24bc-4ab-457e1c1f" HTTP/1.1 304 Not Modified In this case browser is sending both If-None-Match and If-Modified-Since. My question is on the server side do I need to match BOTH etag and If-Modified-Since before I send 304. Or Should I just look at etag and send 304 if etag is a match. In this case I am ignoring If-Modified-Since .

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• DNS server at router level vs. computer level

  - by Craig

  I've three questions. Is it better/faster/optimal to set up your server's preferred and alternate DNS servers in your OS's network settings or in your router settings? Will it cause problems if it is set up in both places, both pointing to the same IPs? I am running Windows and I have my network assign a static IP to one of my computers. This doesn't allow me to obtain the DNS server addresses from my router automatically. Is there an IP I can put in that will cause it to take the DNS server addresses from the router?

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• Double root folder vs single root folder

  - by Tomas

  On my Linux box, in bash, I have access to a "double root" folder denoted by two forward slashes: tomas:~ $ cd / tomas:/ $ ls bin/ cdrom@ ... tomas:/ $ cd // tomas:// $ ls bin/ cdrom@ ... The content of the folder and its subfolder is identical to the "normal" single slash root. The double slash does not go away when I access its subfolders. The annomaly does not repeat itself with three or more slashes; these are simple synonyms for the root: tomas:// $ cd home/tomas tomas://home/tomas $ cd /// tomas:/ $ cd //// tomas:/ $ What kindof place is it? Is it a bug? Can anyone explain the annomaly?

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• 4 GB DDR2 vs 2 GB DDR 3...........

  - by metal gear solid

  I 'm going to purchase new PC. due to my budget limit either i can purchase 2 x 2GB = 4GB DDR 2 or 2 GB Single stick DDR 3. Will 2 GB DDR 3 will give almost same performane compare to 4 GB DDR 2? In future I will upgrade RAM upto 8 GB Which option would be better for me for now and why?

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• Best choice for off-site backup: dd vs tar

  - by plok

  I have two 1TB single-partition hard disks configured as RAID1, of which I would like to make an off-site backup on a third disk, which I am still to buy. The idea is to store the backup at a relative's house, considerably far away from my place, in the hope that all the information will be safe in the case of a global thermonuclear apocalypse. Of course, this backup would be well encrypted. What I still have to decide is whether I am going to simply tar the entire partition or, instead, use dd to create an image of the disks. Is there any non-trivial difference between these two approaches that I could be overlooking? This off-site backup would be updated no more than two or three times a year, in the best of the cases, so performance should not be a factor to be pondered at all. What, and why, would you use if you were me? dd, tar, or a third option?

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• windows server 2008 vs ubuntu 11 [closed]

  - by user472875

  I am working on implementing a custom server application that should be capable of handling a very large volume of traffic. I am aware that this type of question has been asked a lot, but I haven't been able to find a good answer. What I'm really looking for is for a server with given specs which OS will be able to handle a larger traffic faster and more reliably. I do not care about rights management or any other features. I am fairly good with both platforms, and so I would like to pick the OS with better performance on a clean install, and with nothing else running. Thanks in advance.

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• c# Xna keydown with a delay of 1 sec

  - by bld

  Hi!. im writing a tetris in xna. i have a class with a method rotateBlocks. When i press the "Up" arrow key. i wanna have that when i hold the button down for 1 sec or more that it executes the arguments in the first else if(rotating the blocks fast) right now nothing is happening. i have declared oldState globally in the class. if i remove the gametime check in first the else if the block will rotate fast imedietley. if i try to step through the code with linebreaks the resolution get f****d up public void RotateBlocks(loadBlock lb, KeyboardState newState, GameTime gameTime) { _elapsedSeconds2 += (float)gameTime.ElapsedGameTime.TotalSeconds; if (lb._name.Equals("block1")) { if (newState.IsKeyDown(Keys.Up) && !oldState.IsKeyDown(Keys.Up)) { // the player just pressed Up if (_rotated) { lb._position[0].X -= 16; lb._position[0].Y -= 16; lb._position[2].X += 16; lb._position[2].Y += 16; lb._position[3].X += 32; lb._position[3].Y += 32; _rotated = false; } else if (!_rotated) { lb._position[0].X += 16; lb._position[0].Y += 16; lb._position[2].X -= 16; lb._position[2].Y -= 16; lb._position[3].X -= 32; lb._position[3].Y -= 32; _rotated = true; } } if (newState.IsKeyDown(Keys.Up) && oldState.IsKeyDown(Keys.Up)) { // the player is holding the key down if (gameTime.ElapsedGameTime.TotalSeconds >=1) { if (_rotated) { lb._position[0].X -= 16; lb._position[0].Y -= 16; lb._position[2].X += 16; lb._position[2].Y += 16; lb._position[3].X += 32; lb._position[3].Y += 32; _rotated = false; } else if (!_rotated) { lb._position[0].X += 16; lb._position[0].Y += 16; lb._position[2].X -= 16; lb._position[2].Y -= 16; lb._position[3].X -= 32; lb._position[3].Y -= 32; _rotated = true; } _elapsedSeconds2 = 0; } }

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• Create a dynamic project template in VS 2010?

  - by jonhobbs

  This might sound a bit of an odd question but I know what I want to achieve, just don't know if it's possible. Firstly, I'd like to be able to create a visual studio project that the 2 developers that work with me can use as a basis for all new websites. I want to drop all the common files that we use in there, like jQuery, CMS files etc. so that every time they start a new project they don't have to worry about all of that stuff. I guess to do this I just set up a project and "File Export Template" ? Now, here's the tricky bit... When you open up one of the default templates in VS it asks you a few questions, such as if you want to use a master page or if you want to use code behind etc. What I would like to do is set up something similar so that when you use the project template it asks you what version of jQuery you want to use so that it can import the right file, or for example it might ask you if you want to include certain user controls that the CMS contains. If you tick the box then the folder with the necessary user controls would be put in your new project for you. I know MS can do this but can a user like me include functionality like that in my own project template? Hope that makes sense.

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• Amazon EC2 performance vs desktop

  - by flashnik

  I'm wondering how to compare performance of EC2 instances with standard dedicated servers and desktop. I've found only comparance of defferent clouds. I need to find a solution to perform some computations which require CPU and memory (disc IO is not used). The choice is to use: EC2 (High-CPU) or Xeon 5620/5630 with DDR3 or Core i7-960/980 with DDR3 Can anybody help, how to compare their performance? I'm not speaking about reliability of alternatives, I want to understand pros and cons from the point of just performance.

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• Hyperthreading vs. SQL Server & PostgreSQL

  - by IanC

  I have read that hyperthreading is a "performance killer" when it comes to DBs. However, what I read didn't state which CPUs. Further, it mostly indicated that I/O was "cut to < 10% performance". That logically doesn't make sense since I/O is primarily a function of controllers and disks, not CPUs. But then no one ever said bugs made sense. What I read also stated that SQL Server could put two parallel query ops onto 1 logical core (2 threads), thereby degrading performance. I have a hard time believing SQL Server's architects would have made such an obvious miscalculation. Does anyone have and data on how hyperthreading on current generation CPUs affects either of the RDBMSs I mentioned?

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• Trying to understand Wireless N vs Wireless AC

  - by EGHDK

  Whenever a new wireless standard gets approved you expect faster speeds and longer range. From everything that I've read about it, it seems that AC will only transfer over the 5GHz band and up to 3Gbps. Studying the new AC routers on the market, it seems that they will transfer over 5GHz and 2.4GHz. And 5GHz will only transfer at 1.3Gbps. Which isn't what AC is supposed to be. I know there is a difference between what the standard actually says, and what products will actually do, but is there any reason for this? Is there any other main differences between AC and N? I've heard people discussing AC and saying that it's finally "fixing" what N was supposed to fix... what do they mean by that? Any security benefits? I have seen this image online: Will AC really do that? Will that require an AC network card in my laptop for that to actually happen? Lastly, will the router only be able to communicate with AC devices if I have beamforming technology on? I know it's a ton of questions, but most articles online seem to be outdated, and don't provide too much reliability.

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• I/O ports vs case holes

  - by David Oneill

  I'm in the midst of building a new desktop (first time building my own). I bought MSI NF750-G55 AM3 NVIDIA nForce 750a SLI HDMI ATX motherboard, and HEC 6C28BS Black / Silver Steel ATX Mid Tower case. When they both arrived, I realized that the I/O panel on the case doesn't have the same holes that the motherboard needs. So my two questions are: 1) What should I have done? Both claim to be ATX. Do I just need to look more carefully at the pictures? 2) What should I do now? Can I just remove the whole panel (leaving empty spaces between and around the different ports? Specifically, will it cause problems to do this? (I'm looking for advice about question 1, but will accept based on question 2)

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• 802.11n vs 802.11n draft

  - by Andrew Robinson

  Looking to buy a new router. Any appreciable differences between 802.11n (final) and draft 2? Should I hold out for a router that is certified with the final standard?

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• SELinux vs. AppArmor vs. grsecurity

  - by Marco

  I have to set up a server that should be as secure as possible. Which security enhancement would you use and why, SELinux, AppArmor or grsecurity? Can you give me some tips, hints, pros/cons for those three? AFAIK: SELinux: most powerful but most complex AppArmor: simpler configuration / management than SELinux grsecurity: simple configuration due to auto training, more features than just access control

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