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• Is virtual machine slower than the underlying physical machine?

  - by Michal Illich

  This question is quite general, but most specifically I'm interested in knowing if virtual machine running Ubuntu Enterprise Cloud will be any slower than the same physical machine without any virtualization. How much (1%, 5%, 10%)? Did anyone measure performance difference of web server or db server (virtual VS physical)? If it depends on configuration, let's imagine two quad core processors, 12 GB of memory and a bunch of SSD disks, running 64-bit ubuntu enterprise server. On top of that, just 1 virtual machine allowed to use all resources available.

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• Ubuntu Lucid (10.04) subpixel font rendering crashes Xorg

  - by user36066

  Hi everyone... I really don't know how to solve this on my own so I thought giving this site a chance. After upgrading to Lucid I ran into some problems. With some experimenting I came to a conclusion that if I enable subpixel smoothing on fonts the moment I start any other application not native to GTK+ (wine, openoffice, wxWidgets, ...) my X server crashes the same moment. At first this seemed like something went wrong during installation. To cut the long story short, after 3 clean installations and whole bunch of experimenting the same thing happens all over again. Strange thing is... if I configure any other font smoothing besides subpixel, everything works like it should. Any thoughs?

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• Restoring VM's in Hyper-V from a (somewhat) failed VSS backup...

  - by DeliriumTremens

  I attempted to do a backup of our virtualization server when moving from Hyper-V 2008 to R2. I changed the registry settings to register Hyper-V VSS with Windows Server Backup, and sent the backup on it's way while I went on to other things. Apparently the VSS portion didn't back-up the VM's like I had hoped, and after updating Windows Server and Hyper-V to R2, I was unable to restore the VM's correctly. The backup completed and I have all of the files from before the update backed up, but is there any way to restore the VM's from the backup? The vhd's all seem to have old modified dates, and when bringing the machines up from these vhd's they have very old settings. I have found a bunch of avhd files (named according to GUID), but I'm not sure if I can create a VM with the old vhd and merge the snapshots with it.

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• Disable incremental search in firefox (and everything else!)

  - by Alan Curry

  All I find from googling "disable incremental search" is a bunch of people telling me how great incremental search is. It isn't. Firefox has the worst version of it, jumping around and making me lose my place because of a search I haven't even finished typing yet. I don't want the window scrolling up and down without my say-so. It would be nice if I could search with regular expressions, like text search has been done in every non-toy application since ed. But the jumpiness of the window is the overriding concern. How can this evil be defeated?

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• Access synced notes from iPhone on Windows other than through Mail/Outlook?

  - by jtimberman

  I see from the iPhone how to page that synced notes on Windows appear in MS Mail or Outlook/Outlook Express. I don't use any of these programs. Can I access the iPhone notes some other way? I don't see indication on Apple's site that such a thing is possible. I would like to do this without a 3rd party iPhone application, and I'd really like to avoid MS Mail/Outlook. For what it's worth, this is for my wife and she's using Windows. I sync my iPhone with a Mac. She's loathe to use a bunch of different programs.

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• Asus ux31e zenbook SSD non-standard / cant upgrade hdd?

  - by FstaRocka

  I bought a ux31e asus zenbook, and the drive crashed last week. I just cancelled an mSata ssd order because I fear asus has used a non standard ssd!!! what a bunch of crooks, ive lost all my respect for this company! Can anyone confirm what and why? My SSD model is xm11 128gb - it looks like a ram chip and only has two tongues with 12 and 6 pins respectively. The drive I was about to order mSata had 8 where mine had 6 - i never bothered counting the rest. This article seems to confirm! UX31 UX21 Zenbook Article "It looks like SSD uses a non-standard format"

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• Understanding IUSR_<machine> account

  - by liho1eye

  Namely how is setting read/write permission for this account different from giving read/write access in the IIS (Windows 2003, so it should be IIS6 if I am not mistaken). Here is the issue: It looks like we had a security sweep and as a part of that IUSR account lost write access everywhere. A whole bunch of legacy ASP sites didn't like that at all... My very surfacish understanding is that it is enough to deny write access in the IIS console to protect a website from someone just dropping random files into it, and IUSR access only has effect on the application scripts running server side, and thus can be safely given write access back. edit: The applications in question obviously require write access to their own web folders, otherwise this wouldn't be an issue at all. Question is how to configure IIS/application to both satisfy security and make them work. My first instinct was to change account which is used to run the app pool. However that is already set to NETWORK_SERVICE, and that guy already has full access to folders in question.

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• What is the difference between "could not find host" and "timed out" when pinging fails?

  - by Gutsygibbon

  As the title states. I was trying to ping a bunch of servers whose existence I am not sure of. There are 10 servers in all. Two of them got ping timed out while the other eight have could not find host. The 2 timed out ones show an IP which times out too on pinging. I did a quick nslookup on these servers and they did not have any DNS entries. What is the difference between "could not find host" and "timed out" when pinging fails?

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• Why is my /dev/random so slow when using dd?

  - by Mikey

  I am trying to semi-securely erase a bunch of hard drives. The following is working at 20-50Mb/s dd if=/dev/zero of=/dev/sda But dd if=/dev/random of=/dev/sda seems not to work. Also when I type dd if=/dev/random of=stdout It only gives me a few bytes regardless of what I pass it for bs= and count= Am I using /dev/random wrong? What other info should I look for to move this troubleshooting forward? Is there some other way to do this with a script or something like makeMyLifeEasy | dd if=stdin of=/dev/sda Or something like that...

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• How should oracle vbox look like in terms of Memory, CPU and Performance? [duplicate]

  - by Nicholas DiPiazza

  This question already has an answer here: Can you help me with my capacity planning? 2 answers I've got a need for a ton of VMs to simulate some realistic load testing scenarios. I've got a bunch of different host machines that differ in ram, cpu's, etc. What should my resource manager look like? Is there a standard way to know what the CPU, Memory and Disk Utilization should be given your CPUs + Memory available + Disks available? For example, I have a box: MemTotal: 50 Gb CPUs: 8 CPUs are pretty much 100% all day long. Memory is at about 60%. Swap not getting hit. Little bewildered by why the VMs, while doing the exact same test script, are showing different virtual memory consumption. Huh.

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• Apache .shared folder

  - by Kevin

  There are already a bunch of rules in my Apache configuration. What I want to add is the following. There are some shared folders (.shared): /var/www/.shared/ and /var/www/.include/.shared/ and /var/www/.include/(.*)/.shared/. Now when someone visits http://domain.com/test.png it first executes the existing apache rules and will (when the file/folder was not found) look in those .shared folders. So suppose I've got this filesystem: /var/www/.shared/dog.png /var/www/.shared/test.gif and /var/www/domain.com/dog.png. Now when someone visits http://domain.com/test.gif, it must load the test.gif from the .shared folder. Now when someone visits http://domain.com/dog.png it must load the dog.png from the domain.com folder (because the existing apache rules will be executed first).

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• How to maintain VPS server?

  - by clorz

  Assuming I have no experience in running them, what would be called a good maintenance routine for a VPS server running mail server and LAMP with a couple of sites. I've got one for quite a while now, but was doing what I feel is right without any guidance. It's ubuntu server and the only thing I do is ssh in there once a month and apt-get update, apt-get upgrade. Last year it suggested to update the distro, which I did. Waded through a bunch of diffs, broke mail server in the process and fixed it later on. So it turned out fine. Was this a right thing to do or should I stick with the old version just updating the packages? Is there a difference in the routine if it will be Fedora?

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• In Excel how can I sum all the numbers above the current cell?

  - by Mark Meuer

  I want to have a column in Excel that consists of a header, a bunch of numbers, and then have the sum of those numbers at the bottom. I'd like the sum to adapt to the insertion of new numbers above the total. Something like this: Numbers 1 2 5 10 18 Total If I later insert 10 new numbers in the middle of the list, I want the sum to automatically include them. I know the SUM() function can sum a whole column, but if the total is also in that column then it complains about a circular reference. How can I just sum the numbers above the total?

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• Synced audio ouput on multiple machines? VLC? hardware solutions?

  - by zimmer62

  I'm wondering if there is any software or hardware solutions to synced audio or audio and video across multiple computers or devices on a network. I've seen Sonos, and it might be a good solution, but it's also a very expensive solution. I'd like to be able to play something with realtime audio output on one PC, but hear it on speakers throughout the house, being it the home theater receiver, or another computer in another room. I saw a solution using the apple iport express, but the latency was unacceptable for anything other than just music. I'd like to avoid running audio wires with baluns to a bunch of amplifiers scattered all over the place when I have cat5 run everywhere. Is anyone familiar with using this kind of process for whole home audio? The latency is a big deal for me, if I've got video attached to the sound (e.g. watching a hockey game)

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• Modify Oracle SOA Suite 11g repository DB config

  - by Alfabravo

  Hello there! Don't know if this question goes here or in superuser. Anyhow, let's try. I have an Oracle SOA Suite installed in a server. The repository database is installed in another server. Both are virtual. Sadly, we don't have snapshots neither UPS and lights went off yesterday... the repo database is now a bunch of unformed bits and we need to recreate it. ¿Is there any way to reconfigure Oracle SOA Suite to use a brand new repository? Or should I paninfully reinstall the whole crap? Thanks in advance.

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• How to create an rpm without a build step

  - by infra.user

  I'm trying to create an rpm of some code which doesn't need to be built. It will just need to run a script when it's installed on the destination system (i.e. I just need the %install portion of the spec file). I've left both %build and %configure sections of my rpm spec file empty, yet rpmbuild continues to try and execute ./configure with a bunch of parameters. Does anyone know how I can have rpmbuild create the rpm without trying to run ./configure? Thanks.

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• how to design LAN connectivity between private and corporate ?

  - by maruti

  there is a bunch of servers connected to shared storage in a private LAN (10.x.x.x). this privateLAN is managed by a windows server (DHCP, DNS and directory services). how can these hosts be accessed from outside of this privateLAN? Eg. Remote desktop. can the NIC2 on each of the hosts be connected to the other public LAN (compromising speed or security? what are improtant considerations: additional hardware? like switches? routing&DNS software?

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• How can I get logrotate dateext to reflect the log date rather than the rotation date?

  - by Adam

  My Apache logrotate config looks like this: /var/log/http/*log { monthly dateext dateformat .%Y.%m [... rest stripped for brevity ...] } This works great, except that the date on the rotated filename is one period later than the period actually covered by the logs, for example error_log.2012.09 covers 2012-08-01 to 2012-08-31. I realize that there are other options for Apache (eg. cronolog), but I have a bunch of other logs that I also need to rotate, and logrotate is really exactly what I need apart from this one issue. Is there a way to get logrotate to use a date offset -- or, even better, figure out the previous time period -- when generating the rotated filename?

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• Move already (i.e. not new) completed files in rtorrent

  - by Skippy le Grand Gourou

  I've been using rtorrent for a while with a single directory. Now I figured out it was possible to use different directories and even to move completed downloads elsewhere, so according to the rtorrent wiki I edited my .rtorrent.rc as follow : # Download directory directory = /Medias/torrents/ # Watching directories schedule = watch_directory_1,5,60,"load_start=/path/to/dl/dir1/*.torrent,d.set_custom1=/path/to/done/dir1" schedule = watch_directory_2,5,60,"load_start=/path/to/dl/dir2/*.torrent,d.set_custom1=/path/to/done/dir2" # On completion, move the torrent to the directory from custom1. system.method.set_key = event.download.finished,move_complete,"d.set_directory=$d.get_custom1= ;execute=mv,-u,$d.get_base_path=,$d.get_custom1=" It seems to work for new torrents. However I have a bunch of completed files I have already downloaded before to split directories, and for them it does not work : if I delete their file in the session directory, rtorrent will check the hash but won't move them, and if I move them by myself rtorrent won't see them and will try to redownload them. So how can I tell rtorrent either to move them or that they are in another directory ? Thanks.

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• Why does the Windows XP Task Manager icon disappear from the tray?

  - by Jason Owen

  One of the more annoying bugs in Windows XP is the tendency for the Task Manager icon to not show up in the tray (aka the notification area). Sometimes it does, sometimes it doesn't, and it's not consistent enough to have an obvious cause. Looking on Google turns up a bunch of forums that have the same problem but no working solution. Why does the task manager icon sometimes not show up? How can I repair it when this happens (how can make it show up when it's missing)? How can I prevent it from not working in the first place, so that I don't have to worry about repairing it after the fact?

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• Isolated Network Set-Up

  - by Isaac Kleinman

  I am looking to set up a small network for a client which would be isolated from his primary network. (I'm hoping to set-up the additional network as VMs on the primary network.) I've instructed the client to request a bunch of static ip addresses from his ISP, but I'm not sure how to proceed with setting this up. What hardware will I need and how do I go about the configuration? Heavy security is not my concern. All that's really required is that web requests from the two networks be presented to the outside world with different ip addresses.

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• Good Wiki for SMB with Customer Interaction

  - by wag2639

  Hey, I know there's a bunch of wiki questions already but I was wondering if anyone could recommend a good wiki thats good for use internally and can be access by some clients? Must be free (F/OSS preferred), Ubuntu (9.10+) compatible, and have per-page permissions. I setup MediaWiki and its fine for internal use but I don't know how, without some severe hackery, how to restrict a client to just view one page and all the images on it and css. It'll be worse when they ask to be able to modify it as well. Edit: also, please no java solutions

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• PuTTY: how to properly emulate -t option

  - by John Sonderson

  On Linux the ssh command has a -t option whose man page reads: Force pseudo-tty allocation. This can be used to execute arbitrary screen-based programs on a remote machine, which can be very useful, e.g. when implementing menu services. Multiple -t options force tty allocate, even if ssh has no local tty. I would like to use this same option with PuTTY on Windows. In particular, I can see that PuTTY has a bunch of options under: Category - Connection - SSH - TTY and suspect it might be possible to achieve the same behavior via some of the (NUMEROUS!) settings found on this screen. Anyone know how to configure the following command: ssh -t USER,[email protected] create Thanks!

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• Drive still usable if Seatools reports errors?

  - by Rob

  I have a Seagate 3TB Expansion Desktop drive that was part of a Linux RAID 6 array that failed. I eventually did a zero fill both through Seagate DiscWizard and via Linux dd, neither reported errors. When I ran Seatools now, I got: Short DST - Started 5/31/2014 10:04:36 PM Short DST - Pass 5/31/2014 10:05:37 PM Long Generic - Started 5/31/2014 10:15:19 PM Bad LBA: 518242762 Not Repaired (whole bunch of bad LBAs ommited) Bad LBA: 518715255 Not Repaired Long Generic Aborted 6/1/2014 3:12:18 AM i.e. the short test passed, the long test failed. Unfortunately, the drive is out of warranty, so I can't just RMA it. But I hate tossing a drive that can still be used. So, my questions are: If the zero fill succeeded, and the short test passed, can I still use the whole drive? if not, since I'm using LVM on top of RAID, is there a way to tell either of these to just skip the bad area? If not the above, can I just create partitions before and after the part of the drive with the bad LBAs?

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• LAN full of public ipv4 addresses - How to filter it?

  - by sparc86

  The answer to my question maybe is not that hard but anyways, I do not know what to do. So, I just got in a new job in a Univerisity and I found out that the network (the LAN) is full of public IP addresses. Seriously, the whole LAN (probably more than 150 hosts) has it' own internet IP address and I don't know how to manage it. I have a very good experience using iptables (Linux firewall) in a NAT'ed environment. But then how should I proceed in an environment where all my LAN is working with a bunch of public IP addresses? Should I just use the "forward" rules and ignore the NAT rules or is there any other issue in such environment which I should take care? Can I add a firewall between the router and the LAN in order to produce packet filtering for these public IP addresses in my LAN or will this just not work? Thanks!

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