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• sonicwall nsa 240

  - by Adam

  Hi We are looking into putting a hardware firewall into a data center to protect our rack of servers. We are using the servers for terminal services and we have 2 x 1GB connections to the Internet. We have about 50 servers supporting about 250 users which will grow very soon to 500 users. We plan to purchase 2 hardware firewalls to provide HA. Do you think the Sonicwall NSA 240 with Total Secure is a good match for this in terms of performance and protection (from spyware, virus etc?) or is there a better purchase? (Maybe a Watchguard X5 or X8?)

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• Optimum number of threads while multitasking

  - by Gun Deniz

  I know similar questions have been asked but I think my case is a little bit diffrent. Let's say I have a computer with 8 cores and infinite memory with a Linux OS. I have a calculation software called Gaussian that can take advantage of multithreading. So I set its thread count to 8 for a single calculation for maximum speed. However I really can't decide what to do when I need to do run for instance 8 calculations simultaneously. In that case should I set the thread count to 1(total 8 threads spawned in 8 processes) or keep it 8(total 64 threads spawned in 8 processes) for each job? Does it really matter much? A related question is does the OS automatically does the core-parking to diffrent cores for each thread?

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• How do UEFI and virtual machines relate to each other?

  - by Iterator

  I am trying to get my head around UEFI (Unified Extensible Firmware Interface) and it's not entirely clear to me how this affects virtual machines. Thus, there are three parts to this question: Is UEFI an advance in hardware support for virtualization? All other things being equal, would a machine with UEFI be more likely to run a virtual machine more efficiently than one without, or does UEFI cause any performance hits that negate any speed improvements from a virtual machine? Would the difference in execution be visible to code running in a virtual machine? (In theory, it shouldn't, but in practice?)

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• Older raid controllers in raid 5 vs. Jbod and SW raid

  - by TEB

  Hi. Im in the fortunate position to have 6 Supermicro older VOD servers with the following config: Supermicro 3U case, 3xPSU Dual Xeon 3ghz P4 class cpu (5 years old.. havnt checked the exact type) 4GB Ram 3ware 9500-8 SATA controller 8 SATA SLOTS and alot of free drives. 2GB FLASH Bootdrive What im curious about is the RAID5 performance on these old beasts in HW mode vs. SW on Linux with the controller set in JBOD mode. Im thinking on using Centos 5.5 or Ubuntu or ZFS RaidZ on Opensolaris. Any tips? or reccomendations ? best regards TEB

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• why udp client work when wirshark capture?

  - by herzl shemuelian

  I have two machine A,B windows 7 os .I connect them end to end and try run a performance test by using tcpreplay. step 1) I check conectivity between to point by netcat In A i run nc -lvup 5432 when I run on B nc -u 1.2.3.4 5432 I can send data from B to A step 2) when in I run tcpreplay in B tcpreplay -i %0 myudp.pcap in A I don't recevice any data . when I open wireshark in A then my nc can read data why? I check dst mac and dst ip in pcap file they are correct. is importan udp src mac or src ip for udp how that I open udp server ?

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• Where should I go to learn about networking? [closed]

  - by Ollie Saunders

  I wonder if anyone could recommend resource or resources such as a good book that: explains how all the important protocols work and interact. I’m interested in those that are relevant in a typical home network and used over the Internet explains in detail how ADSL Internet connections work to the level of depth necessary so that I’m able to tweak and measure performance settings starts from the beginning but attempts to provide proper understanding rather than idiot-oriented steps to follow Basically, I’m interested in how these technologies work and tend to be implemented in hardware and software rather than “here’s what to do if…” I’m interested in Computer Networking by Andrew S. Tanenbaum and I wonder if anyone else has any experience with that title. It’s expensive but I could probably loan a copy for £3 from the library or so.

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• Small business VPN solution

  - by Crash893

  I've been looking for a while but I'd like to to implement a vpn solution for anywhere from 1-5 employees at a time (possibly 10 in a year or so) edit: Basically I would like outside users to fire up a client or open a web page and be able to access things inside the company network (share drives / printers/ webapps /etc) I've looked at Astaro Gateway but im not sure if that's the right tool for the job. I know "best" is a subjective term so i would like to break it into to different suggestions 1) what is the cheapest solution given the criteria above 2) what solution will result in the least amount of headaches from the point of view of maintenance and learning curve.

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• Timeouts when connecting to SQL Server since installing SP1 for Windows 7

  - by Julien

  Hi, I just installed SP1 for windows 7 and I have severe performance degradation when connecting to SQL Server 2005 since then. Establishing connection takes more than 30 seconds while it's instantaneous on another computer. Firewall is disabled and I didn't make any change to the configuration. It happens both when trying to connect with a hostname and with an ip address. Everything else seems to be fine (for instance, I'm have no issue connecting to other computers with remote desktop) What can cause such a problem? Thanks in advance! Edit : uninstalling the SP1 solves the issue instantly.

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• Quad Core host with hyper-threading, how many processors to configure in VirtualBox?

  - by Anthony

  I have a quad-core i7 processor with hyperthreading (8 logical cores), when I configured a virtual machine to use 8 processors, VirtualBox gave me a warning saying that I only have four cores (which is true) and that this may cause a performance issue. But hyper-threading is a hardware feature, so the OS sees 8 cores and it sends instructions to all 8. What if setting it to 4 caused the VM to use 2 cores (4 threads) instead of 4 simultaneous threads (on all 4 cores)? Does the warning I got take into account that my machine has hyper-threading?

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• Test site speed

  - by Elad Lachmi

  I am test driving an Akmai CDN architecture and before committing to buy, I would like to gauge the real performance gain from the acceleration feature. What would be the best MO for doing speed tests from different locations around the world? I would like to test the page load speed and not just the server response time. I would like to test speed from as many edge locations as possible. I do not mind a paid service as well, if it is optimal. Thank you!

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• launchctl - use rvm instead of system Ruby in executed scripts?

  - by Stefan Kendall

  I have a launchctl job I define as such: <key>ProgramArguments</key> <array> <string>/bin/sh</string> <string>-c</string> <string>~/projects/script.sh</string> </array> When I run script.sh manually, the script works fine, as it uses the currently configured rvm version of ruby. When I run this through launchctl, the system version of Ruby is used, which breaks the script. How can I get this script to run with the right version of ruby available?

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• How to force my laptop to use the discrete GPU?

  - by Anton Roth

  My laptop (Asus X7BSV) is stuck using only the integrated GPU. It has a nVidia GT540M as well, but I cannot get it to work. I am using a Windows 7 x64 with latest drivers. This occurred after I attached an external USB monitor I need for work, and since then I cannot swap back to the nVidia GPU (dxdiag for example says that the primary GPU is the Intel integrated one). Asus support asked me to completely reinstall the system, but that is something I do not want to do. I checked the BIOS, there is no option as to what GPU to use. The nVidia card itself is working, since I can use CUDA on it, and it worked with a Ubuntu Live CD. In the nVidia software management I tried setting it to global setting, high performance GPU (nVidia), but that had no impact. What am I missing here? I did uninstall/delete all drivers and software related to the external monitor, but that did not help.

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• Software to measure the speed of http browser connections

  - by Dan Revell

  I'm trying to gather some ammunition about my ISP and it's aggressive traffic shaping of particular websites. So I'm looking for an application that will allow me to see what speeds I get to particular websites. I want to open a browser connection to a particular video streaming website for example and see the speed of the connection that gets made, be it http or plain tcp. I'm after something along the lines of TCPView but unfortunately this doesn't include transfer speeds. I'm half tempted to write one myself but hopefully something will already be out there that does the job.

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• SGE: downtime planning

  - by mousee

  I need to plan a downtime for a maintenance of my environment (or some part of my environment) by means of Sun Grid Engine. Is it possible to somehow use backfilling information to tell the grid engine to plan only those jobs on cluster which are able to finish (i have backfilling information) till let's say 10 am next day? Can I then at 10 am rely on the fact that all compute nodes are clean, jobs are only queued, no job is planned and so that I can start maintenance? Thank you for your time. mousee

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• new xp install, but it moves slow

  - by doug

  hi there I just installed new XP windows OS on a old laptop. I did also all the updates I was asked for. I installed also, the latest driver updates from the official laptop producer site. Now, when I try to use that laptop to talk on Yahoo! Messenger, the sound quality is very bad, and I barely hear what the other person is saying. Before I was reinstalling the XP the laptop were working fine. do you have any tips for me? What software utilities to try in order to improve it's performance? what software utilities to install in order to test it's performances?

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• Get a file from a load balanced server in Windows Server

  - by Leandro

  I've a load balanced server on production environment for my application. The server is on Windows Server 2008 R2. I'm running a web application that creates and save a file into a folder on the web path. So I need to create a job that copy this file into another server. The main idea is that a file watcher checks for the file and then copy it instantly. But how can I know in what server it's the file? Please avoid "why you don't" answers to get a directly answer, if it's someone.

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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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• Microsoft Ergonomic Keyboards With Card Readers?

  - by Steve

  When I started working at my current job I developed tendinitis in my wrists. Luckily that cleared up when I started using a Microsoft ergonomic keyboard. The problem is that where I work is moving to more security. We will need to stick a card into a slot to log into our PCs. They bought a bunch of new keyboards with these slots built in. All regular keyboards. Is there something like the Microsoft Ergonomic keyboard that comes with such a card slot? Thanks.

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• Make SoX not show output

  - by Ram Rachum

  I'm recording with SoX, and I want to make it not show output at all. When recording, it shows this output: Input File : 'default' (waveaudio) Channels : 2 Sample Rate : 48000 Precision : 16-bit Sample Encoding: 16-bit Signed Integer PCM In:0.00% 00:00:00.68 [00:00:00.00] Out:28.7k [ | ] Clip:0 I tried setting verbosity to 0, but it has no effect. (I'm guessing it's meant for messages other than this.) I don't just want to hide the output, which I could do easily; I want SoX to not generate it in the first place, for performance on a weak computer.

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• Advice for migrating email server

  - by Chris Adams

  Hi there, I'm planning to migrate a Zimbra server with about 200gb of data from a server hosted in an office into a datacentre, to increase uptime (we've had a couple of outages when our network here started flaking out, and we have people in other countries relying on this server too). However, I'm not sure how best to migrate the data into the data centre without rendering the connection unusable during office hours, because there's far too much to send in over night over the two meg upstream connection we have here. I'm familiar with using tools like nice to stop a long running process degrading machine performance - is there a simple way to throttle a connection between office hours, so the long running transfer doesn't block the pipe, but then opens up outside of office hours to make the most of the bandwidth? I'm aware the alternative here is to simply mail a hard drive to the data centre, but I'd like to avoid doing that if I could. We're using Centos Linux for our servers, in the office and the datacentre, so extra points for an open source linux answer.

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• MongoDB on FreeBSD

  - by Hartator

  We are currently using MongoDB 2.0.0 on MacOS but our servers are running FreeBSD. The most recent port of MongoDB is the 1.8.3 version. I have tried to compile the 2.0.0 by hand but I came across errors that I didn't manage to fix. I came across on the Internet a few old resources which are saying that MongoDB does not run well on FreeBSD mainly for performance issue (memory mapped files). Is that true ? Does it mean we have to switch our server to another OS ? Thanks for your opinions! Sources : http://groups.google.com/group/mongodb-user/browse_thread/thread/8131b7e5a5c710d9 http://ivoras.net/blog/tree/2009-11-05.a-short-time-with-mongodb.html

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• Issue with Capslock key on Laptop

  - by Mr New

  For some reason my laptop has a mind of its own and the Caps Lock tends to come on whenever it feels like it. I thought it was an software issue from that reasoning, but I later cleared the OS and then reinstalled it hoping to fix the problem, but it didn't. Not only does it do that it also comes on and off whenever the letters A, S, and left shift key are pushed. So I assummed it was a keyboard issue and that the keyboard needs to be replaced, but it has one of those touch pad cap lock buttons also, because even when I press that button it tends to not react. So how can that be fixed with a keyboard replacement or is that connected still? EDIT - I followed the direction with the following code in notepad and it didn't do the job: Windows Registry Editor Version 5.00 [HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Keyboard Layout] “Scancode Map”=hex:00000000 00000000 0200000000 00003A00 00000000

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• OS X clients ignoring Windows print server permissions

  - by Ilumiari

  I'm in the process of testing a Windows Server 2008 R2 print server for a mixed OS X/Windows environment. Any security permissions (AD groups) I set for the printers on the print server are not honoured by the OS X clients. Only if I remove absolutely all permissions for a given printer will an OS X client not print to that printer. The Windows clients honour the permissions as expected. The PrintService log doesn't record any activity when an unprivileged Windows client attempts to print, and records a typical print job when an unprivileged OS X client attempts to print. Has anyone encountered this problem before and have a fix? With 600-700 clients, a number of which are dual-booting, restricting by IP address is not viable. EDIT: The jobs are definitely going through the print server, they show up in the logs with their AD credentials.

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• How do I log file system read/writes by filename in Linux?

  - by Casey

  I'm looking for a simple method that will log file system operations. It should display the name of the file being accessed or modified. I'm familiar with powertop, and it appears this works to an extent, in so much that it show the user files that were written to. Is there any other utilities that support this feature. Some of my findings: powertop: best for write access logging, but more focused on CPU activity iotop: shows real time disk access by process, but not file name lsof: shows the open files per process, but not real time file access iostat: shows the real time I/O performance of disk/arrays but does not indicate file or process

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• What is the best solution for letting both Macs and PCs access digital images and videos on a networ

  - by Gertbert

  I'm looking for a simple way to share digital images and videos over a network to both Macs and PCs. I'm currently looking into three options: NAS, WD MyBook Mirror drives attached to a router, or an HP WHS product like the Data Vault. I'm looking for something easy to implement that allows for drive mirroring but also has good performance for both Macs and PCS. I've read that the HP WHS devices rebalance on their own schedules, making them useless for streaming video, and hope someone can definitively confirm or deny this as it's a dealbreaker if true. Any other suggestions are appreciated. Thanks!

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