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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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• 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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• Routing Essentials

  - by zharvey

  I'm a programmer trying to fill a big hole in my understanding of networking basics. I've been reading a good book (Networking Bible by Sosinki) but I have been finding that there is a lot of "assumed" information contained, where terms/concepts are thrown at the reader without a proper introduction to them. I understand that a "route" is a path through a network. But I am struggling with visualizing some routing-based concepts. Namely: How do routes actually manifest themselves in the hardware? Are they just a list of IP addresses that get computed at the network layer, and then executed by the transport? What kind of data exists in a so-caleld routing table? Is a routing-table just the mechanism for holding these lists of IP address (read above)? What are the performance pros/cons for having a static route, as opposed to a dynamic route?

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• Parity Initialization after putting in two new disks

  - by lbanz

  All my firmware is up to date on the server and the controllers. Storage crashed over the weekend. I rebooted it and it detected that I put in two new disks last week (I did check that both disk completed the rebuilding process last week). After it booted into the OS I see that it gave me an information message. After 18 hours it is at 54% so it is looking healthy. But I need to replace 5 more disk in the msa. Should I wait for this message to finish before replacing more disks? 785 Background parity initialization is currently queued or in progress on Logical Drive 1 (15.0 TB, RAID 5). If background parity initialization is queued, it will start when I/O is performed on the drive. When background parity initialization completes, the performance of the logical drive will improve.

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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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• Using Google's App Engine as CDN for static files

  - by Saif Bechan

  I am planning on moving my static files to Google's App Engine. I was wondering if this is a good idea to do. I have read that is it possible that Google will cache your files on multiple locations, which is a good thing in my opinion. The setup should also be quite easy in eclipse with the GAE plugins. But i still have my doubts on the performance of this. Is the setup of App Engine optimized for serving static content. Now I have Nginx server my static content, will App Engine perform the same way. Are there any other ups or downs using this method?

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• How do ulimit -n and /proc/sys/fs/file-max differ?

  - by bantic

  I notice that on a new CentOS image that I just booted up off of EC2 that the ulimit default is 1024 open files, but /proc/sys/fs/file-max is set at 761,408 and I'm wondering how these two limits work together. I'm guessing that ulimit -n is a per-user limit of number of file descriptors while /proc/sys/fs/file-max is system-wide? If that's the case, say I've logged in twice as the same user -- does each logged-in user have a 1024 limit on number of open files, or is it a limit of 1024 combined open files between each of those logged-in users? And is there much performance impact to setting your max file descriptors to a very high number, if your system isn't ever opening very many files?

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• Sync a specific folder of contacts to iPhone

  - by colemanm

  Is there a simple way to organize contacts in Outlook/Entourage and only have a subset of them synchronize with the iPhone over Exchange ActiveSync? Our CEO has thousands of contacts in his mailbox, but would prefer if only a small portion of them synched to his phone over the air... The iPhone's performance takes a huge hit keeping that massive dataset in order. If he could put some of the records in subfolders or something and only sync the top level, I think that would work for him. Does anyone know if this is possible?

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• Linux servers vs Windows IIS sense of usage "free" solutions

  - by Rob

  I wonder what is the sense of using "free" open source solutions for serious webstie applications? Crawled and read many testing of servers performance and there is one conclusion: IIS seems to be the best choice for high load applicatiom. I mean cost effective. Especially this concers to Nginx PLUS and LiteSpeed Users where subscriptions paid for e.g. LoadBalacer and extra support cost a lot in fact. I'm asking then where it's "free" then or "cheap" in this case? Assuming even little higher cost of dedicated servers with Windows still seems like Windows looks cheaper. At it's basic setup Windows 2012 with IIS offer much more than std LAMP, or other NGINX config.... Maybe am I missing sth ? I mean only general case for someone who did not already started his app. I know exactly that the cheapest solution is the one someone is skilled. Has anyone done already such real costs calculation for example scenarios?

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• IPtables rate-limit, What are the differences between modules? Recent, Limit

  - by TechZilla

  I am doing some rate-limiting with IPtables, and i'm not sure if I should use "Recent" or "Limit" What are the differences between the two? If they both achieve the same result, which one has better performance? I would like to know, regardless if any difference would be perceivable. I am looking to ACCEPT if under limit, and REJECT if over. I'm not interested in thus bandwidth throttling, I don't want a queue. I don't need any syntax examples, both have ample use examples online. I have also used Limit in the past. I appreciate any responses.

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• using nmap to guess remote OS and probe service details on a single port only

  - by WoJ

  I am looking at scanning with nmap a large network in order to identify the OS of devices (-O--osscan-limit) probe for details of a service on a single port (I would have used -sV for all open ports) The problem is that -sV will probe all the ports (which I do not want to do for performance reasons) and I cannot use -p to limit the ports to the one I am interested in as this impacts the OS fingerprinting. I could not find anything in the manual to limit the service probing. Thank you for any ideas (including other approaches outside of nmap, though I would prefer to stick to nmap)

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• Nexenta under KVM?

  - by Nick

  I have an Ubuntu Server running KVM. I'd like to get the benefits of ZFS so I was thinking of installing a virtual machine under KVM running Nexenta (or NexentaStor), allowing that virtual machine to have raw access to a couple of physical hard disks, and then having it share its file system with NFS so that Ubuntu can access it. I've never tried setting up KVM so that the virtual machine has access to physical drives. Does this sound feasible, and is there anything I need to watch out for? Has someone already documented something like this? Does Nexenta/ZFS function basically as well in the virtual environment as if they were running base bones? I can take a small performance hit, but I don't want it to not be as reliable because of the virtualization. Thanks.

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• Prevent Windows 7 from unpluging External HDD

  - by marverix

  I have installed Windows 7 as my media server. I pluged in 500GB external HDD via USB. I have changed power plan to Best Performance and changed advenced power settings to never turn off HDD etc. I even yesterday wrote powershell script (create and delete folder on this disk) and I have added it to harmonogram to run every 5 minutes starting from system boot. And nothing! Disk after some time (I realy can't say when) is turning off and Windows show "Unknown Device" in Device Manager. Then only system reboot or disk reboot helps. Any ideas how to prevent Windows 7 from stopping my external HDD? Cheers!

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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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• How do ISPs/Colocation Facilities limit bandwidth for Ethernet Drops?

  - by Kyle Brandt

  I have switch providers and have run into some problems with bandwidth limitations. I have more bandwidth then before, but there are performance issues. The router is connected to a 100mBit port, but they limit it to arbitrary settings (in software I imagine). It seems when I go above the limit, the provider starts to drop packets beyond the limit (This is what they said they do as well). Is it possible the previous provider did something like queuing packets above the this limit before dropping them? Is anyone aware of not only what can be done, but what is typical? Also, is there anything I can do on my Cisco router to help this situation? It would seem I am pretty helpless if the packets are dropped before they reach my interface (The traffic that is high is inbound to my network).

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• Apple Airport Extreme Wireless Card M8881 Connectivity Issue

  - by Carlosfocker

  I bought a Apple Airport Extreme Wireless Card M8881 with the antenna for my old Power Mac G5 1.6 Ghz. The computer is running OS X 10.4. The card works and I can connect to my dlink 802.11g wireless router using WPA2/AES encryption. The problem is that the connection has intermittent connectivity issues. When the issue occurs the signal bars for the connection drop to one or two bars and the performance of the connection suffers greatly. The computer isn't far from the wireless router. I have a laptop at the desk where the mac is and it does not have any issues. I'm not sure what it might be? Updated drivers? Firmware? Let me know if I forgot any important information.

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• How must I deal with anti-virus software on Windows 7

  - by Heather

  I know this question is looking like an easy question or not a question at all but it's not really easy question. I'm not related to security and anti-viruses and just don't trust every provided anti-virus. So first question is a real question - Is it OK (safe) to not use anti-virus at all. I know how to use firewall, usually I use only trusted connections and surfing trusted sites. My chances to get virus is really low. Even I've got a bit outdated PC and don't want to pay the performance for it. I can do monthly scans without having one installed - is it OK to be safe ? If not can you recommend a good free antivirus solution?

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• SSD install - what do I need to watch out for when reconfiguring SATA ports?

  - by tim11g

  I installed a Samsung 840 SSD in a Windows 7 machine. It seems to be working fine, but I'm not seeing the expected performance. The AS SSD benchmark gives 76 for read and 138 for write. At the upper left of the benchmark it says "pciide - BAD" and "31K - BAD". I'm assuming the "pciide BAD" means the motherboard (Gigabyte GA-P35-DS4) is configured as IDE emulation and needs to change to native SATA. I don't know what the "31K" refers to. The bios settings look like this: I saw this article that indicates that changing the SATA mode of the boot drive can cause problems (Blue Screen): Error message occurs after you change the SATA mode of the boot drive What is the correct procedure to change the SATA Mode without causing a system failure? Apply the registry change from the MSFT article above first, then reboot and change the SATA mode? Will the SATA mode change in the BIOS affect other drives?

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• What does advantages of WIM image that file based vs. ISO or another sector based images in Administrator

  - by saber tabatabaee yazdi

  answers of this question is very important to administrators to choose between Microsoft solution or other 3rd Party Tools. WIM solution is file based and others are sector by sector images like Acronis or other backup and clone tools like Norton Ghost or Cloning in vmware ESXi and etc. My question about the advantages of WIM to edit or deploy in Enterprise? to get agreements of managers to choose between these alternative decisions. Are we had any Key Performance Indicators in Change management? Are there any statistics about compares of these solutions? What Time is spend in any solotion to get image or change images or revert and apply images? Is it possible to change and modify images that made in All of these solutions as easy as in WIM file?

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• Would NetBSD be a good choice for a web server?

  - by Alexander

  I've the choice of crafting a NetBSD image for a Xen VPS host, and was just wanting to play around as I like BSD and wished to use it for my general web hosting. I will be hosting a low-mid traffic website and maybe a few other simple services. Do you think NetBSD would be a sufficient choice, in terms of general performance of multiple system users and fair amount of traffic to Apache compared to what Linux could normally handle? I am concerned if I do start to really like it and keep it, I may be limiting myself if I am to move further with my web host and get more traffic (and maybe a lot of FTP access and user shell accounts) Ken

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• Resilient Linux Mail Server Setup

  - by Coops

  How would people design a resilient mail server setup with Linux? On an application level what the system needs to provide is both an incoming and outgoing mail service (i.e. SMTP & IMAP), along with filtering and archive storage (the archive part isn't critical yet, so we'll look at this later probably). What is required on top of this is a resilient system, i.e. one which will handle individual server failures without interrupting service. As such I would term this a High Availability mail system. This is in contrast to a High Performance mail setup, as in our case the volume of mail being handled isn't the important factor, it's simply that it stays online. Having not approached this problem before, the first thing I thought of was a clustered file system (gfs/gluster/etc), combined with heartbeat to failover a floating IP to another box in the case of a server failure. Combined with postfix & dovecot does this sound feasible to people?

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• Upgrading from MySQL Server to MariaDB

  - by Korrupzion

  I've heard that MariaDB has better performance than MySQL-Server. I'm running software that makes an intensive use of MySQL, thats why I want to try upgrading to MariaDB. Please tell me your experiences doing this conversion, and instructions or tips. Also, which files I should take care of for making a backup of MySQL-Server, so if something goes wrong with MariaDB, I could rollback to MySQL without issues? I would use this but i'm not sure if it's enough to get a full backup of MySQL-Server confs and databases mysqldump --all-databases backup /etc/mysql My Environment: uname -a (Debian Lenny) Linux charizard 2.6.26-2-amd64 #1 SMP Thu Sep 16 15:56:38 UTC 2010 x86_64 GNU/Linux MySQL Server Version: Server version 5.0.51a-24+lenny4 MySQL Client: 5.0.51a Statistics: Threads: 25 Questions: 14690861 Slow queries: 9 Opens: 21428 Flush tables: 1 Open tables: 128 Queries per second avg: 162.666 Uptime: 1 day 1 hour 5 min 13 sec Thanks! PS: Rate my english :D

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• How to check if a server runs in pressing mode

  - by Ice

  Hi there, Layout: i have at customer side a server (win2003 R2 SP2 standard edition 32-bit) with a sql-server 2005 and some databases. This system starts with the /3GB-Switch. The system reports 3.25 GB RAM and taskmanager reports the process of sqlserver.exe with 2758255 K as the process with the highest consumption. The OS separates RAM for applications and for itself, normaly 50:50. But here we have the /3GB-Switch aktivated and i think the part for the applications is more than 50% of RAM. Knowledge (or better not knowledge): Somebody told me that if the OS runs out of memory within his part of RAM, the server runs into pressing mode. Questions: What is this pressing mode? Is pressing mode possible at all in this szenario? What should be done to get more performance out of this sql-server, beside optimizing the database and all this stuff.

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• What happens when you add a Graphics card to a i7 with build in graphics (e.g. HD 4000)

  - by Matt

  I'm thinking of upgrading my computer from an AMD Phenom II X4 955BE with a AMD Radeon HD 6800 Graphics card (not integrated) to using a Intel Core i7 3770. As I have no knowledge of integrated graphics, my question is, what happens to the computing power when not using the HD4000 integrated graphics of the CPU (does it mean the CPU will run faster then it would if I relied on it?) Also what is better the CPUs inbuilt HD4000 or my Radeon Graphics card? I am mostly interested in terms of content creation: Using Adobe After Effects, 3D Rendering etc. Not too bothered about gaming performance. I will be using the spare parts of this build and older systems to make a second computer for network renders so what will be the advantages of keeping the Radeon with the current system for that?

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• Using Windows 7 XP Mode for games

  - by Josefvz

  Hi all. I have Win 7 (x64) at home and I want to play some old games (specifically Lands of Lore 3, but also some others). This game does not work properly on Win 7, and there are no patches that I'm aware of to fix its issues. Can I use XP Mode to play this game (and other non Win 7 nice games), or is there a better way? I only have one PC and dual booting scares me... (so no to dual booting!) Another question: Will I have full hardware support (full use of my graphics card, etc) when I use DOSbox or a VM? I have decided to go with VirtualBox or vmware, I'll check which one gives the best performance, thanks for your input!

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