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• Squid 2.7 in offline_mode yet tries to contact DNS servers to resolve addresses

  - by William C

  I installed Squid 2.7 to act as a web cache on my laptop, so that I can browse previously-visited sites when I don't have WiFi. Except http_access allow all, I've made no changes to the default squid.conf configuration. When I turn offline_mode ON and disconnect from the Internet, and then I visit sites, I encounter The following error was encountered: Unable to determine IP address from host name for whatever.sitename.com The dnsserver returned: Timeout on any site I visit. What settings do I need to add to squid.conf so I can browse sites offline?

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• Is there a way of disabled byte-range requests in Apache?

  - by Sam Minnée

  I have a web page with a link to a PDF file (target="_blank"). If I click the link, the PDF reader just shows a grey screen within the Firefox browser. If I copy that link and manually open it in a new tab, the PDF will display correctly, and subsequent requests made by clicking the original link now work, suggesting that the problem occurs when loading the file into the cache. It appears as though the Adobe PDF reader plugin is making byte-range requests (I see lots of 206 responses) and I suspect that this may be the cause of the issue. I am running an Apache webserver. Has anyone had problems with Apache and Adobe's byte-range requests? Are there any workarounds? Perhaps a way of configuring Apache to ignore byte-range requests on PDFs?

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• SIP Service to record all calls?

  - by TK Kocheran

  I read an article that I can't find at the moment which detailed a way to have Google Voice point to a SIP phone number which forwards to your phone in order to take advantage of the SIP service in order to Have all calls use a data connection = no usage of cell-phone plan minutes. Record each and every conversation.* I really want to be able to accomplish this, primarily issue number 2, as all of the phone recorder tools in the Android Market essentially don't work for my Nexus One. I figure that I have one of two options with this. I could 1) use an existing (hopefully free) service which will do this for me or 2) I could set up a SIP service at my home. to somehow forward calls through my home server which will record the calls as well as forward calls to my cell phone. Obviously, the path of least resistance is the one I'd like to go down. Can anyone help me out with this? * I do understand that the legality of this varies from state to state here in the US.

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• Iozone: sensible settings for a server with lots of RAM

  - by Frank Brenner

  I have just acquired a server with: 2x quadcore Xeons 48G ECC RAM 5x 160GB SSDs on an LSI 9260-8i Before deploying the target platform, I'd like to collect as much benchmark data as possible, testing I/O with hardware RAID in various configurations, ZFS zRAID, as well as I/O performance on vSphere and with KVM virtualization. In order to see real disk I/O performance without cache effects, I tried running Iozone with a maximum file of more than twice the physical RAM as recommended in the documentation, so: iozone -a -g100G However, as one might expect, this takes far too long to be practicable. (I stopped the run after seven hours..) I'd like to reduce the range of record and file sizes to values that might reflect realistic performance for an application server, hopefully getting the run times to under an hour or so. Any ideas? Thanks.

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• VFS and FS i-node difference

  - by gaffcz

  What is the difference between VFS i-node and FS (e.g. EXT) i-node? Is it possible that EXT i-node is persistent (contains/points to data blocks), but VFS i-node is created just in i-node cache after read/use of EXT i-node? Or the VFS i-node is just an image of FS i-node (it's the same) and i-nodes in those systems, which are not working with i-nodes (e.g. FAT, NTFS) has to be emulated (HOW?) to allow VFS work with those FS like they would support i-nodes?

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• Is it reasonable to make a RAID-1 array with a ram disk and a physical disk to maximize read performance and protect data?

  - by Petr Pudlák

  In one of the answers on SO (I forgot which one) I've seen a suggestion to make a RAID-1 array composed of a RAM disk and a physical partition. By adding the physical partition with --write-mostly and enabling --write-behind the system should read everything instantly from the RAM disk but still save all data to the physical partition so that the data are preserved and the RAID array can be assembled again after reboot. Is such a setup reasonable? Will it perform any better in some scenario than having just the physical partition and perhaps tweaking the kernel to favor disk cache (swappiness and vfs_cache_pressure)?

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• caches domain user on local PC

  - by user630320

  We have a fully working domain in UK and around the world we have user who use VPN ( checkpoint) to connect to or domain. One of the user in USA has a laptop which he never logged on to before ( it does caches the user login details). Does anyone know how to cache user login information on this laptop. I have tried netdom trust to add this user to the laptop but i was not able to do this. At the moment user is logging in with a local administrator account and then using VPN to log on to our domain but when it comes to accessing files on domain user get access deieded. When user try to login it gets There are currently no log on servers available to service the logon request Does anyone know how to add user.

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• Backup solution

  - by user66115

  We are currently looking for a new backup solution. Our current network is 5 remote location with a tape backup in each plant. Right now we are looking at a MPLS VPN and running backups out of our main plant. The main thing that we backup are user private folders and department files. And each plant has it's own file server that houses CAD drawings. My main plan is to have every thing but that CAD drawing at the main faculty. We would start with a main backup of the drawing files and then do change backups back to the main plant. Besides tapes what would be the best way to backup. Our contact at Pc Connection is point us toward a Tandberg Data device.

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• reaching 99.9999% uptime

  - by christopher-mccann

  I am currently developing a project which is mission-critical. The actual domain name is registered with 1 & 1 and I plan on purchasing DynDNS Custom DNS service (which has 5 different geographical locations for DNS) and then another secondary DNS service to make sure my DNS is as failover safe as possible. Does it matter that the registration is with 1 & 1 - are they a weak link in the chain? All I really use them for is to say that DynDNS is my primary DNS nameserver and then my secondary DNS is my other nameserver. I can transfer the registration to DynDNS - Im just not sure if it really matters or not. Thanks

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• When HDD wakes up?

  - by NumberFour

  Im looking for some small script or application which could log the time when a non-system disk wakes up. I cannot identify which application or script wakes up my non-system drive (which has to be asleep until I work with it). I have already set the noatime flag, tried to use powertop and iotop to determine which application could prevent it from going to sleep - but with no result. So my plan is to set this drive asleep (hdparm -Y) and see at what time it gets regularly woken up. Thanks for any advice.

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• Mysterious "media" volume mounted on desktop Mac OS X

  - by Allen

  I have a mysterious volume mounted on my desktop that I can't seem to forcibly unmount. I've tried using umount and also diskutil, but it seems to automatically remount itself. I've copied my hdd with Time Machine, and copied it onto a new computer, and it also has the drive mounted on it. It's not pointing to anything and I can't open it, nor can I forcibily remove it by hand with rm -Rf. Any ideas? I noticed this problem after I upgraded to Mountain Lion from Lion. It causes problems because when I try to select a file using the built in Finder dialog box, it freezes for a few minutes because it tries to cache or read into the "media" mounted volume.

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• How to tell from what Ubuntu or Debian repository a package comes?

  - by gotgenes

  On a Debian-based system, including Ubuntu, how can one tell which repository a package will be downloaded from, without actually beginning the download? aptitude show and apt-cache info will show the section (e.g., metapackage, base, graphics), but not the repository to which a package belongs (e.g., http://ppa.launchpad.net/mactel-support/ppa/ubuntu or http://us.archive.ubuntu.com/ubuntu/). When installing the package, the actual repository appears during the download (it is printed out in the "downloading from ..." output from apt and similar programs), but how can one obtain information on the repository containing the package (or a specific version of a package) without downloading and installing it first? Additionally, how can one determine the source repository for a package that is already installed?

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• meeting availability using iPhone/iOS calendars

  - by Jaymie

  Our management team all use iPhones with the built-in iOS calendar app. We're looking into getting Microsoft Exchange for everyone here, but that'll take us some weeks to plan and roll-out across the enterprise. In the meantime, I need to provide something so group meeting availability can be determined from those calendars. Google Calendar would be ideal ("find a time") if I could find a way to link to/export the iCloud calendars, but Apple don't seem to want to do that. I could ask the management team to recreate their events for the next few weeks in individual Google Calendars, but they won't want to do that and it's wasteful rekeying of data. Any suggestions you can provide will be gratefully received.

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• How to import Exchange calendars in Google Calendar (No Desktop Outlook)

  - by Tonny Madsen

  I would like to import my calendar from my company Exchange 2010 server as a new calendar in my private Google account. The primary use is to easy my planning when at home with my laptop. I already have access to both the Google and Exchange calendars on my Android phone, but the size of the screen makes it rather difficult to plan anything serious. Note that I run OSX on my laptop I would prefer a Internet based solution to any software on my own laptop. I do not want an Outlook add-in I do not want to include the work related events in my main calendar I do not want a mobile solution I can pay for the solution

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• How to step down voltage from 208V to 110V

  - by Eric Dennis

  I have some racks that will be fed by 208V/20A circuits. These circuits will be conditioned and battery-backed by the facility in which these racks will live. 99% of the devices in the rack will be able to support 208V input, so I plan to use these PDUs. However, there may be one or two odd devices that will need 110V input. I know that I can use a step-down transformer to provide 110V for these devices, but that seems like overkill for such a small number of devices, plus I don't want to pay extra for the UPS functionality since my power will already be battery-backed. Any suggestions for something I can use for these one-off 110V devices?

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• How to move a windows machine properly from RAID 1 to raid 10? [migrated]

  - by goober

  Goal I would like to add two more hard drives to my current RAID 1 setup and create a RAID 0 setup on top of the two RAID 1 setups (which I believe is referred to as "RAID 10"). Components Involved Intel P68 Chipset Motherboard 4 SATA ports that can be configured for Raid An intel SSD cache that sits in front of the RAID, and a 64 GB SSD configured in that manner Two 1TB HDDs configured in RAID 1 OS: Windows 7 Professional Resources Consulted so far I found a great resource on LinuxQuestions.org for a good "best practices" process for Linux machines, but I'd like to develop a similar process that I know works on Windows Machines.

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• Online backup service _with_ filtering (by extension, size and so...)

  - by QyRoN

  Hello, I recentely discovered an ability to backup personal data to online server but I was never surprised when I didn't found a popular service provides filtering capabilities, i.e. all of them they backup all the contents of specific folder. Are there any free options with filtering? To be specific, I need following features: Backup to online server. Automatic but bandwidth-transparent backup, i.e. it will backup my files automatically but won't try to do it if I'm heavily using the computer or internet at the moment. Individual filtering settings for folders, i.e. I want to specify which files to backup in every folder. Some free plan (since I'm not going to use more than 500MB of space).

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• EC2 custom topology

  - by Methos

  Is there any way to create a desired topology of EC2 instances? For example, can I create a 3 node topology of nodes A, B, C where C gets the public IP address and B and A are connected to it. Something like: Internet <-- C <-- B <-- A B and A only get private IP addresses and there is no way for the traffic to reach A before hitting B and C. This means I can install whatever I want to install on C and B to filter, cache etc. I'm going through EC2 documentation but so far I have not seen anything that talks about it. I will really appreciate if anyone knows how to do this on EC2

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• Prevent Windows 7 from unpluging External HDD [migrated]

  - 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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• What are possible reasons why a calendar entry in OWA is at a different time than in Outlook?

  - by Ken Pespisa

  We have two Exchange 2003 servers, our primary server and a front-end server that hosts Outlook Web Access (OWA). When I open my boss' calendar via Outlook 2007 (from my Outlook client as well as hers) I see the event scheduled for 10:30 am. When I open her calendar via Outlook Web Access, the same event is scheduled for 4:30 am. I don't understand Exchange well-enough to imagine how this is possible. If you have any ideas why this could be happening, I greatly appreciate it. I'd also very much appreciate any insight you have to how this could be possible. There must be some cached data on the front-end server that causes the calendar entry to appear at a different time, I suppose. Any insight into how Exchange manages that cache and where I could look for an issue would be very helpful. Thank you!

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• ATI Radeon Drivers works with which linux distribution and version? [closed]

  - by amit.codename13

  I have ATI Mobility Radeon HD 5850 graphics card. Almost every new linux distribution seems to have an issue with it, when i install the drivers. Working without utilizing the graphics card leaves me so unproductive. So i made a plan to use older versions of linux, any distribution suitable as a desktop distribution. The problems that i am facing are, 1) After installing drivers the system boots and hangs, 2) There are unusual lines over the screen 3) After upgrade system doesn't start properly(hangs the usual old way) The kind of answers i am looking for is, distribution X(the newer the version the better) doesn't have the above problem after installing drivers for ATI Mobility Radeon HD 5850 graphics card. UPDATE: The new drivers released by AMD seems to fix all the issues, although they are still beta

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• Using FlashCache on /var on startup

  - by WinkyWolly

  I would like to have FlashCache cache my /var partition however I can't seem to get it to play nice upon bootup (IE: not really sure how to do it). I'm not sure if I need to modify the initramfs/use DKMS or if I can do it in user-land during bootup. The issue I'm running into is /var mounts early and therefore the device is busy (whether it by generally by syslogd). I'm positive this can be resolved by modifying the initramfs although I simply haven't fiddled with it enough to get it working. They have instructions on how to boot your root partition however I'm not sure if these instructions would apply to my use case. Any help / pointers in the right direction would be absolutely splendid.

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• Choosing hardware for Flash Media Server

  - by minaev

  Having read the answers in this discussion, I still would like to come up with the same question: What should I buy to run Flash Media Interactive Server 3.5? I just have slightly different boundary conditions. We plan to serve video to ca. 1,000 users simultaneously. It will be live stream, so the server will receive the stream in HD (1280x720), cache it, reformat to various other resolutions and send it to users. OS of choice is Linux, but if you say it should MS-DOS, so it will be... What would be a decent server for this task?

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• Is it possible to COMPLETELY replace the start menu?

  - by Subaru Tashiro

  I plan to make a replacement for the Windows 7 start menu, and I would like to know if that's even possible. I understand that the start menu is part of explorer.exe but I do not intend to replace explorer.exe. Is it possible to launch the replacement start menu by clicking the native start orb? Is it also possible to launch the replacement by pressing the Windows key or ctrl+esc ? Is the Windows key a macro for ctrl+esc ? or is it two different hotkeys that do the same thing? May I know if there is any software that do any one of these things?

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• Seeing DNS changes takes too long on my PC, can it be my router misconfiguration?

  - by Borek

  I administer a few sites and need to update their DNS entries from time to time, e.g., adding an A-record point certain subdomain to a certain IP. When I check sites like http://www.opendns.com/support/cache/, I can clearly see the DNS change taking effect throughout the world - is it just my PC that can't see this change (ping newsubdomain.example.org says it cannot resolve host name) The network "map" is like this: My PC -> my router -> my ISP's router -> internet On my PC, the DNS is set automatically which means that if I run iconfig /all, my router will be returned as the DNS server (192.168.1.1). On my router, the DNS is set to be what my ISP provided me with. Is this correct? What can I do to see new hostnames resolved quicker?

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