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• VMware vSwitches and Dell PowerConnect BPDU guard

  - by dunxd

  I am using two Dell PowerConnect 6248 switches to connect a VMware host vSwitch. A discussion of config of Cisco switches for use with VMware advises to set physical ports connected to vSwitch with bpduguard and portfast. However, Dell switches don't have the bpduguard setting for individual ports. I can switch it off globally for all portfast ports, but I don't think I want to do that. Should I: Disable STP on the vSwitch connected ports? Leave STP on and enable portfast on the ports, and forget about bpduguard? Disable bpduguard on all portfast ports via global config Do something else? See also: VMware vSwitches and spanning tree

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• Ping / Trace Route

  - by dbasnett

  More and more I see programmers developing web based applications that are based on what I call "ping-then-do" mentality. An example would be the application that pings the mail server before sending the mail. In a rather heated debate in another forum I made this statement, "If you are going to write programs that use the internet, you should at least have a basic idea of the fundamentals. The desire to "ping-then-do" tells me that many who are, don’t." On this forum and at Stack Overflow I see numerous questions about ping / trace route and wonder why? If it is acceptable to have a discussion about it here I would like to hear what others think. If not I assume it will be closed rapidly.

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• Outlook 2003 (with Exchange 2007) error: You cannot respond to a meeting without an Organizer

  - by Hissohathair

  The company recently upgraded to Exchange 2007. Since the upgrade users who are still on Outlook 2003 (SP3) get the following error for some meeting requests: You cannot respond to a meeting without an organizer. You must add an Organizer field to the item. The item has an organizer field filled in. Exchange is 2007 with SP1 MS Office (incl Outlook) is 2003 with SP3 Some users are using iPhones to accept / reject meetings. The iPhones never get an error like this. There are no delegates for the user attempting to accept or reject the meeting. Sometimes the meeting was previously accepted, sometimes not. We have not detected a pattern in the meeting requests that trigger the issue. I've found a few people asking the same question on other websites but no answers. Experts Exchange claims to have an answer but from looking at the discussion at the bottom of the page I'm pretty sure they don't.

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• iChat can't authenticate to Lion Server 10.7.2 [migrated]

  - by glenstorey

  I've enabled iChat and iCal Server through our local 10.7.2 Server which has DNS set up correctly. I can add the server account via a client's System Preferences (under other - Mac OS X server) and it authenticates with my shortname correctly. However, when I load iChat, I get this error message: Where the account is [email protected]. The password and username is correct. Console throws this error: 22/11/11 3:03:31.135 PM imagent: [Warning] XMPPConnection: Error: Error Domain=XMPPErrorDomain Code=105 "The operation couldn?t be completed. (XMPPErrorDomain error 105.)" UserInfo=0x7f81bbe2a3e0 {XMPPErrorText=service requested for unknown domain} DNS is set up correctly (it's working for Profile Management, Software Update Server and Web Services) but I can't get iChat to work correctly. How can I get clients to authenticate? FYI: It's probably worth noting that I get the exact same error messages when I use [email protected] instead of [email protected]. Also posted this question on Apple Discussion here.

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• XPS vs PDF. What's the status?

  - by Redandwhite

  XPS, the PDF alternative, seems to be almost dead in the water. That said, Windows 7 offers a built-in XPS printer and viewer. I believe Vista also offers a built-in printer. XPS seems lighter than PDF, perhaps it only appears so because of Adobe's bloated reader, but that's for another discussion. Is it worth it to begin encoding in XPS instead of PDF? Will Vista or above be able to read it without problems? What should I look out for?

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• Can you reference an entire column in OpenOffice Calc (like A:A in Excel)?

  - by Andy

  I'd like to refer to an entire column, like you can in Excel by using A:A. I found a discussion on the openoffice.org forums which is a few years old, and suggests there is/was no neat way to do it. The options presented are Use A1:A65536. Use OFFSET($A$1;0;0;65536;1) as the previous range may get altered if you insert or remove rows. Use Data - Define Range... to name the column range (but which for me still just equates to $A$1:$A$1048576). These approaches seem over-complicated and still don't achieve my goal perfectly. Does anyone know of a way? Thanks, Andy

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• Probability of failure with larger number of network elements

  - by MikeKulls

  I'm having a discussion with a work colleague. I'm saying that a network with 100 elements will have pretty much 10 times as many failures as a network with 10 elements, ie a tech will need to replace faulty hardware 10 times more often. He suggests that the failure rate doesn't go up in a linear fashion and the failure rate will be significantly less than 10x, in fact only slightly more failures. This is not the probability of an outage etc, we are just talking in relation to the amount of parts that a tech would need to swap out in a given time frame.

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• Securely wiping a file on a tmpfs

  - by Nanzikambe

  I have a script that decrypts some data to a tmpfs, the directory is secure (permissions), the machine's swap is encrypted (random key on boot) and when the script is done it does a 35 pass wipe (Peter Gutmann) of the cleartext on the tmpfs . I do this because I'm aware wiping files on a journaling file system is insecure, data may be recovered. For discussion, here're the relevant bits extracted: # make the tmpfs mkdir /mnt/tmpfs chmod 0700 /mnt/tmpfs mount -t tmpfs -o size=1M tmpfs /mnt/tmpfs cd /mnt/tmpfs # decrypt the data gpg -o - <crypted_input_file> | \ tar -xjpf - # do processing stuff # wipe contents find . -type f -exec bcwipe -I {} ';' # nuke the tmpfs cd .. umount -f /mnt/tmpfs rm -fR /mnt/tmpfs So, my question, assuming for the moment that nobody is able to read the cleartext in the tmpfs while it exists (I use umask to set cleartext to 0600), is there any way any trace of the cleartext could remain either in memory or on disk after the snippet above completes?

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• vCenter Server: This host currently has no management network redundancy

  - by goober

  Background I'm on a new VMWare install consisting of: 1 vCenter Server (containing inventory service, SSO, vCenter server, and web client server) 2 ESX Servers configured in a HA group Problem When a I view the summary for any one of my servers, I receive a notice: "" This is expected in our scenario and we're okay with it. Attempted Solutions As I understand from this article and this discussion, the proper way to remove the error message is to ignore it via setting the "das.ignoreRedundantNetWarning" propery to "true". I took the following steps: Logged into vCenter Right-clicked on my HA cluster and chose "Edit Settings..." Clicked "vSphere HA" section Clicked "Advanced Options..." Added the "das.ignoreRedundantNetWarning" option with a value of "true". Question How do I get this error to go away, and are there any reasons why adding this option may not have worked? References Network redundancy message when configuring VMware High Availability in vCenter Server [VMWare KnowledgeBase] How remove a notice " has no management network redundant" [VMWare Community]

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• smartctl or hddtemp for xvda [on hold]

  - by HST

  I'm trying to check the state of the drives on a remote server running Debian wheezy. I'm using a software RAID10 on top of, I guess, xen, since the entries in /dev are /dev/xvda and /dev/xvdb But it I try smartctl -a /dev/xvda I get /dev/xvda: Unable to detect device type Smartctl: please specify device type with the -d option. I've tried various device type guesses, none work Similar problem with hddtemp, which reports ERROR: /dev/xvda: can't determine bus type (or this bus type is unknown) I've searched the smartmontools documentation, but can't find any discussion of virtual disks. . . How do I get behind the virtualisation to something smart tools or hddtemp can work with?

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• Where does power consumption go in a computer?

  - by Johannes Rössel

  Today we had a weird discussion over lunch: What exactly causes power consumption in a computer, particularly in the CPU? Figures you usually see indicate that only a percentage (albeit a large one) of the power consumption ends up in heat. However, what exactly does happen with the rest? A CPU isn't (anymore) a device that mechanically moves parts, emits light or uses other ways of transforming energy. Conservation of energy dictates that all energy going in has to go out somewhere and for something like a CPU I seriously can't imagine that output being anything but heat. Us being computer science instead of electrical engineering students certainly didn't help in accurately answering the question.

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• Does Lapping a CPU / Heatsink actually drop the temp?

  - by Pure.Krome

  Hi folks, i've been watching some YouTube vids about Lapping a CPU. I've never heard of this modding technique before and, though extreame, I was wondering if it acutally works? Assuming you lap your cpu and/or heatsink correctly, will the temps drop? When I say drop, at least a 1 degree drop is success (for the debate of this topic). To keep this topic clean, please refrain from anyone commenting on the overkill of labour, just for a 1 degree (worst case) drop, etc. This is a discussion about the theory and concept, not personal opionion of wether to lap or not.

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• Multiple apps in one "icon" on the iPod touch [closed]

  - by Jerry

  I have researched but can't find any discussion about moving several apps into one "icon" on the iPod touch screen. I have moved 5 apps (all the same category) into one what is normally one app icon. The title on the icon reads "games" - all are games. I have all the apps jiggling and drag one game app on top of another game app - They move to be side by side and the title automatically reads "games" - is this "OK" to do - you can have nine apps in each of the 16 spaces available on each screen. Will this hurt the touch? As long as you have space (GBs) is this ok? Has anyone done or heard of this? Any help is appriecated.

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• Should I use my ISP's DNS, or Google's 8.8.8.8?

  - by Torben Gundtofte-Bruun

  It seems like a good idea to use Google's public DNS 8.8.8.8 and 8.8.4.4 because it's really fast -- much faster than my own ISP's DNS! -- and probably more reliable, too. That seems like a ridiculously quick win for me, and much easier to remember. Assuming we're not all "tin foil hat" about Google, why shouldn't everybody use Google DNS? Note: I've seen this question, but I don't want a comparison to OpenDNS. This is about everyday use by everyday people in their homes. Update: I seem to have put my hand in a wasps' nest of privacy concerns. I appreciate the issue, but I was expecting a more technology-oriented discussion...

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• How to merge (and not replace) folders when copying, on mac?

  - by Cawas

  There's a similar question about windows. This is the same, but for mac. If I try to copy or move a folder to somewhere it already exists, it asks to replace it. That would result in deleting the target. Rather I want to merge. There's already a aquataskforce request about this, and it's a discussion going for a lont time if it's even something that should exist on Mac, due to its whole philosophy. Discussions at apple are outdated and didn't help much as well. As usual, there are professional solutions for doing this, such as Changes and Araxis. And there is the rsync or command line alternatives. But I want a free and simple solution, something like how it is done in Windows or Linux. I won't be doing it much anyway. By the way, PathFinder don't have such option as well and FolderMerge doesn't work on Snow Leopard as far as my 1 test went.

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• Dual Core or Quad Core CPU for NetBeans/Eclipse development?

  - by cdb

  I am going to buy a new desktop CPU. I am a programmer who mainly uses NetBeans IDE for Java web application development, with GlassFish application server. I went through the discussion regarding Dual Core or Quad Core. My doubt is that software like IDEs (NetBeans, Eclipse, etc., with a server running) may not be written with multiple cores in mind? I am not a game addict... So what is best for me, and which company should I choose, AMD/Intel?

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• Enable dtrace without sudo on Mac OS X?

  - by Juan

  How do I enable users to use dtrace on Mac OS X. I am trying to do the equivalent of strace on Linux, and I don't like running applications with elevated privileges. UPDATE Ok, the best I can tell. The only way to keep a nefarious application from ruining the system by debugging it is to. Attach to the process in a separate console Use sudo twice So that: sudo dtruss sudo -u myusername potentially_harmful_app I verified this with this short program: #include <iostream> #include <unistd.h> int main() { std::cout << "effective euid " << geteuid() << "\n"; } See this discussion for more info: http://discussions.apple.com/message.jspa?messageID=6430877

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• Compiz command plugin won't register keyboard shortcuts

  - by David Moles

  Per this discussion I've enabled the Compiz commands plugin in order to try to bind some keyboard shortcuts to wmctrl actions. CCSM captures my keystrokes just fine, but no matter what keystroke I try or what command I bind it to (everything from my original intention of binding Super-1, Super-2 etc. to wmctrl -o 0,0, wmctrl -o 2560,0, etc., to binding Ctrl-Alt-Shift-L to gnome-terminal). Basic compiz shortcuts for window switching and so on -- even custom ones -- seem to work fine, but the command plugin doesn't seem to be working at all. I also notice the following symptom: when I open the keyboard shortcut tab in CCSM, the keyboard shortcuts often at first appear blank, though if you click on the blank button, the correct value is still there. Also possibly related, I've noticed that gnome-terminal doesn't seem to notice the Super key, though other apps (e.g. CCSM, Emacs) register it fine. Anyway, it seems like something's eating my keystrokes. Any ideas?

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• Virtualised Sharepoint Backup Strategies

  - by dunxd

  I have a Sharepoint (OSS 2007) farm running on three virtual machines in VMWare ESX, plus a SQL Server backend on physical hardware. During a recent Business Continuity Planning event I tried restoring the sharepoint farm with only the config and content databases, and failed to get things working. My plan was to build a new sharepoint server, then attach this to a restoration config database and install the Central Management site on this server, then reattach the content databases. This failed at the Central Management part of the plan. So I am back to the drawing board on the best strategy for backup and recovery, with reducing the time and complexity of the restore job the main objective. I haven't been able to find much in the way of discussion of backup/restore strategies for Sharepoint in a VMWare environment, so I figured I'd see if anyone on server fault has any ideas or experience.

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• Free Cloud Mind Map Solution

  - by Zekta Chan

  As a Software Engineer we had a lot of discussion on SE design. Although we sync every document on the development process on Google Doc, mind map just didn’t fit in Google doc yet. The best we can do is to store a copy and share it online. To me, Mind map is an ir-replaceable piece of tools (yet) as agile note taking tools. And an eFormat is even greater than a paper one, due to the portability and extensibility. Does anyone have a good solution on “cloud-sharing” mind map? (We are using FreeMind at the moment) Thanks

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• How to recursively move all files (including hidden) in a subfolder into a parent folder in *nix?

  - by deadprogrammer

  This is a bit of an embracing question, but I have to admit that this late in my career I still have questions about the mv command. I frequently have this problem: I need to move all files recursively up one level. Let's say I have folder foo, and a folder bar inside it. Bar has a mess of files and folders, including dot files and folders. How do I move everything in bar to the foo level? If foo is empty, I simply move bar one level above, delete foo and rename bar into foo. Part of the problem is that I can't figure out what mv's wildcard for "everything including dots" is. A part of this question is this - is there an in-depth discussion of the wildcards that cp and mv commands use somewhere (googling this only brings very basic tutorials).

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• Is there a way to delay a forced reboot?

  - by jduff

  I realize this is more appropriate for our company's admin group to field. However, pretend they are unresponsive just for the sake of discussion =) If my system is prompting me to reboot now or in a set time (say in 15 mins) is there a way to delay that even further? It is usually just an inconvenient time and I would like to delay beyond the stated time. (ex) System Restart Required: A newly installed program requires this computer to be restarted. Please save your work and restart your computer. Your computer will automatically be restarted in: xxmins... Thanks for any responses in advance!

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• Do you run anti-virus software?

  - by Paolo Bergantino

  Do you find the crippling effect that most anti virus software has on a computer's performance worth the "security" they provide? I've never been able to really tell myself its worth it, and have used my computer without "protection" for years without any problems. Jeff Atwood wrote about this a while back, taking a similar stance. So I'm looking for some discussion on the merits and downfalls of antivirus software, and whether you personally think its worth the hassle. One point I do think is valid is that I am probably okay with not running it because I know if something goes wrong I have the ability to make it right (most of the time) but I can't really recommend the same for family as they may not be able to...

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• Preserving smart playlist order on iPhone

  - by Doug Harris

  I have a smart playlist configured to play my favorite podcasts during my commute. It's a list of audio-only, unheard podcasts: In iTunes, I've ordered the playlist by Release Date -- i.e. I want to listen to the oldest podcast episodes first. The order is correct in iTunes but when I sync to my iPhone the order is jumbled. Currently, I have five episodes in this playlist -- ordered by release date they're A,B,C,D,E. On my iPhone, they're ordered B,D,C,E,A. There's no sort order that's obvious to me -- not sorted by name of episode, name of podcast, length of episode, date added, etc. Any solutions to ordering smart playlists on the iPhone? Update: This is likely an iTunes 9 bug. There's lots of discussion about this over on apple.com

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• How reduce size of PPT 2010 Notes Pages PDFs?

  - by KnowItAllWannabe

  I have a PPT presentation of about 400 slides that I periodically update and publish as PDF. The view I publish is the Notes Pages. This worked fine for several years, during which time I was using PPT 2002. I recently upgraded to PPT 2010, and now I find that the PDFs I create are about 25 times bigger than they used to be, and the text in the slides part of the Notes Pages is no longer selectable in Acrobat. According to Why does Powerpoint 2010 print notes pages to PDF as raster images? , the problem is that PPT 2010 is rendering the slides' content as images, which is not what earlier versions of PPT did. The solution offered in that discussion involves Office Automation and VBA, neither of which I know anything about, and it's not clear whether that approach solves the problem of the text in the slides not being selectable in the PDF. Isn't there a simple way to get PPT 2010 to print Notes Pages to PDF the way it did in PPT 2002?

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