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• Unhappy with performance of GBit Ethernet to Fiber converter

  - by Aaron Digulla

  I just bought a TP-Link MC200CM GBit Ethernet (1000-T) to Fiber (1000-SX) media converter. The device works but I'm unhappy with the performance: When connecting my computer over 1000-T (twisted pair, Cat 6, 18meters) with my server, I get a throughput of about 610MBit/s. If I replace the cable with two media converters, I'm left with about 310-315MBit/s (i.e. half the performance). My setup is like this: Computer <- GBit switch <- long cable <- GBit switch <- server Computer <- GBit switch <- MC200CM <- 30m fiber <- MC200CM <- GBit switch <- server Is there a way to improve the performance? Will another MC be faster? Or is that about as much as I can expect with the additional 2 converters?

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• DNA and Quantum computing

  - by Jacques

  I recently(A couple of weeks ago) read an article about the future of processing and how quantum-processors and DNA-processors(DNA-computing) are the future competitors of computing since both will completely outperform the computers of this era. In terms of processing speeds, what do we expect from these two different processing techniques ? Personally I believe that DNA-processing will be a major step towards AI. For labs and office work I think quantum-processing which will be more logical. I'm quite excited that i'm still so young - to see what the future of technology holds! Then again my parents will soon find out what the after-life holds... just as bloody exciting, if not more..

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• NFS inherit permissions from shared directory - Mac OS client

  - by devius

  Short question: Is there a way to have files on a NFS share on the client inherit the permissions of the shared directory? Scenario: Ubuntu 12.04 server Mac 10.7.4 client shared directory has 775 permissions created files on client have 644 permissions I tried setting ACLs with the setfacl command, as explained here, and it appears they are set on the server. getfacl returns this: # file: Documents/ # owner: someguy # group: somegroup # flags: -s- user::rwx group::rwx other::r-x default:user::rwx default:group::rwx default:group:somegroup:rwx default:mask::rwx default:other::r-x However, when I create a new file on the Mac OS client it still has 644 permissions and not the 664 I would expect. Files created on the server have the expected permissions. Files created with another Ubuntu client also have the expected permissions.

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• Top ten security tips for non-technical users

  - by Justin

  I'm giving a presentation later this week to the staff at the company where I work. The goal of the presentation is to serve as a refresher/remidner of good practices that can help keep our network secure. The audience is made up of both programmers and non-technical staff, so the presentation is geared for non-technical users. I want part of this presentation to be a top list of "tips". The list needs to be short (to encourage memory) and be specific and relevant to the user. I have the following five items so far: Never open an attachment you didn't expect Only download software from a trusted source, like download.com Do not distribute passwords when requested via phone or email Be wary of social engineering Do not store sensitive data on an FTP server Some clarifications: This is for our work network These need to be "best practices" tips for the end-user, not IT policy We have backups, OS patches, firewall, AV, etc, all centrally managed This is for a small business (less than 25 people) I have two questions: Do you suggest any additional items? Do you suggest any changes to existing items?

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• Can I use a Mac Mini as a web server and database server? What are the pros and cons?

  - by Christopher Altman

  We are a bootstrapped web start up. We have a LAMP web application that we expect relatively low to mid traffic because users need an account to log in. Our current approach is to colocate two servers, a web and mysql database server. We are planning to use Ubuntu Server 9.04. We have shopped around for dedicated servers but the price range from $900 to $1500 per month, therefore we are exploring the colocation approach. We are considering purchasing two Mac Minis (2.0GHz Intel Core 2 Duo 2 Gb RAM) because we are familiar with the machines are the prices are relatively inexpensive. What are the pros and cons of using these 'non-server' grade machines? We would install Ubuntu Sever and attach firewire external hard drives. Any advice on how to set up 'good-and-economic' web/database servers is welcomed.

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• Theoretical Wi-Fi decay

  - by lithiium

  Is there a way to (theoretically at least) calculate the decay on bandwith of a Wifi related to the streght signal? For example, I know that I can theoretically expect 54Mbps of a 802.11g at 100%, which will be the bandwith expected at a 30% of signal? is it lineal? is it the same? I could not find any source for this, but considering the error replay involved, I guess it should be possible to calculate something like this. Anybody knows?

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• Terminal services and memory limits

  - by Mark Wassell

  Is there a way in Terminal Services to set limits on memory related parameters for a process. For example working set size and, possibly, if it makes sense, total virtual memory allocation for the session? To turn the question around, we have an application which cannot allocate as much virtual memory running on a terminal server as it can when running on a desktop PC (both I would expect to have a limit of 2GB for user mode address space) and I was wondering if there is another limit for processes or users on a terminal server. Perhaps even 2GB per user rather than per process.

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• HTTP/1.1 Status Codes 400 and 417, cannot choose which

  - by TheDeadLike

  I have been referred to here that it might be of better help, I've got a processing file which handles the user sent data, before that, however, it compares the input from client to the expected values to ensure no client-side data change. I can say I don't know lot about HTTP status codes, but I have made up some research on it, and to choose which one is the best for unexpected input handling. So I came up with: 400 Bad Request: The request cannot be fulfilled due to bad syntax 417 Expectation Failed: The server cannot meet the requirements of the Expect request-header field Now, I cannot be really sure which one to use, I have seen 400 Bad Request being used alot, however, whatI get from explanation is that the error is due to an unexistent request rather than an illegal input. On the other side 417 Expectation Failed seems to just fit for my use, however, I have never seen or experimented this header status before. I need your experience and opinions, thanks alot! For a full detailed with form/process page drafts, and my experiments, follow this link.

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• Changing the mac address in a libvirt xml config file breaks network connectivity for the guest

  - by foob

  I'm using Xen with libvirt and trying to set it up on a bridged interface. I am able to install an OS and everything works as I would expect. If I save the xml output from "virsh dumpxml guest", edit the mac address for the interface, and then define the domU with this new xml file I find that traffic is no longer forwarded from the vif0.0 interface to br0. The ifcfg-eth0 file on the guest was automatically updated to reflect the new mac address and the ifconfig output looks the same. Does anyone know why this is happening or how to properly change the mac address for a libvirt configuration?

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• How well will ntpd work when the latency is highly variable?

  - by JP Anderson

  I have an application where we are using some non-standard networking equipment (cannot be changed) that goes into a dormant state between traffic bursts. The network latency is very high for the first packet since it's essentially waking the system, waiting for it to reconnect, and then making the first round-trip. Subsequent messages (provided they are within the next minute or so) are much faster, but still highly-latent. A typical set of pings will look like 2500ms, 900ms, 880ms, 885ms, 900ms, 890ms, etc. Given that NTP uses several round trips before computing the offset, how well can I expect ntpd to work over this kind of link? Will the initially slow first round trip be ignored based on the much different (and faster) following messages to/from the ntp server? Thanks and Regards.

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• Problem with Windows activation on a VM (Virtual machine)

  - by Daisetsu

  I backed up a number of laptops to virtual machines before they are to be re-purposed, in case I need the data at some later time. While the Physical to VM processes worked fine I am encountering issues on some of the VMs. When I boot them I get an error message saying I MUST activate windows in order to login. This is expected because the hardware changed (from physical hardware to virtualized hardware). I click the OK button and expect to be prompted with ways to activate, windows sits there for quite a while then tells me that "Windows has already been activated". I click OK at that message and get take back to the beginning where I am asked to activate Windows. I have done some fairly intensive googling but haven't been able to find a real solution. EDIT: The laptops with the issues are 2 Sony Vaios, I believe that they have the OEM version of the OS originally installed by the factory.

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• Are SANs unreliable?

  - by chaos

  So at the place where I wear one of my various hats, this one representing a development rather than admin role, there's been an initiative to move to SANs. So far, I have been spectacularly unimpressed. First it was this behavior where, when MySQL databases are on the SAN, the first few tables that anything tries to hit after the system boots come up as nonexistent and MySQL has to be restarted before it realizes they're actually there. Then today, on multiple systems (including the primary SVN repository, ever-so-wonderfully) we get SAN mounts spewing IO errors and the filesystems going into read-only, which is the kind of behavior I expect from directly mounted naked disks, not fault-tolerant managed storage. Right now, I'm at the point where if I were putting together a project and somebody said "hey we should use SANs", my response would be "GTFO". So basically I want to know whether my experience is typical or even common, or whether I'm having some kind of freakishly bad luck with SANs. The systems these SANs are attached to are all CentOS machines, if that's relevant.

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• Ubuntu Upstart script hangs on start and stop

  - by sbwoodside

  I have an upstart script that will start a custom jetty server. When I do sudo start [myservice] nothing happens. Subsequently, sudo status [myservice] show it as: [myservice] start/killed, process 3586. Here's the script in /etc/init/[myservice].conf: description "[description]" author "[my name and email]" start on runlevel [2345] stop on runlevel [016] respawn expect fork script sudo -u www-data /path/to/grafserv-start.sh >> /tmp/upstart.log 2>&1 end-script And here is grafserv-start.sh: #!/bin/bash /usr/bin/java -Djetty.port=3070 -jar /path/to/grafserv/trunk/start.jar echo "Done starting GrafServ" I've tried redirecting the output of the script command to a tmp logfile, but that file is never created. When I start it, I just get a hang, until I ^C. Also, I tried running it with strace but that gave me a lot of stuff about sockets.

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• LVS TCP connection timeouts - lingering connections

  - by Jon Topper

  I'm using keepalived to load-balance connections between a number of TCP servers. I don't expect it matters, but the service in this case is rabbitmq. I'm using NAT type balancing with weighted round-robin. A client connects to the server thus: [client]-----------[lvs]------------[real server] a b If a client connects to the LVS and remains idle, sending nothing on the socket, this eventually times out, according to timeouts set using ipvsadm --set. At this point, the connection marked 'a' above correctly disappears from the output of netstat -anp on the client, and from the output of ipvsadm -L -n -c on the lvs box. Connection 'b', however, remains ESTABLISHED according to netstat -anp on the real server box. Why is this? Can I force lvs to properly reset the connection to the real server?

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• What to do if my computer is infected by a virus or a malware?

  - by Gnoupi

  This question is coming back often, and the suggested steps are very often the same. In an objective to concentrate useful information in one place, here is a community wiki about it. I expect our best minds to participate in it, so we can have a reference of knowledge, for something like this. What to do if it seems that my computer is infected by a virus, or a malware on a Windows system? What are the symptoms from an infection? What are the steps to follow after noticing an infection? How can I get rid of it? As it is community wiki, feel free to edit this question to improve it as well.

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• Explanation of WCF application life cycle in IIS 6 hosting environment.

  - by David Christiansen

  Hi all and thanks for reading, I have a delay issue where my application takes a long time to start up when first called after an determinate period since the last call. The web application is a WCF service and we are talking about a delay of ~18seconds before the actual processing starts. Now, I believe I know how to reduce this delay so that is not my question (it's more a stackoverflow deal anyway) My question is, Can anyone explain to me why is it that despite me disabling worker process shutdown, and worker process recycling the application still 'winds down' after a indeterminate period of time of inactivity? To understand this I need to know more about the innerworkings of WCF services hosted in IIS. I fully expect there to be a straight forward answer to this. Thank you v. much for any help you may offer, DC

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• Pass quoted argument string to Start-Process in PowerShell

  - by Luke Puplett

  Hello I'm trying to very simply run an executable and pass a file path in as the first argument. In DOS, this would be the command: import.exe "C:\Some Path\With\Spaces.txt" By placing the path in quotes, the path is correctly parsed as the first token into the executable. In PowerShell I'm using this: $feeds = dir 'T:\Documents\Company\Product Development\Data foreach ($feed in $feeds) { start -FilePath import.exe -ArgumentList $feed.FullName } The problem with the Start-Process cmdlet in PowerShell is that it uses a string array for arguments, so the path is broken up and sent to the executable as separate tokens. Quotes in PowerShell force $feed.FullName to be treated literally. Double quotes "" make PowerShell not see anything in the argument list. "The argument is null or empty." it tells me. I expect that this is a known headache and has had a known workaround from day one. Thanks Luke

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• What is the purpose of a boot priority sequence or order in BIOS

  - by rbeede

  A BIOS provides multiple options for specifying an order/priority to search for boot devices. Is there really much of a purpose now to have to specify more than one possible boot device? It would seem to me it is only useful when popping in an CD/DVD to install an OS after which the common scenario is to always boot from the hard drive unless something is broken. I'm curious as to why not simply have 1 option/device to set in the BIOS and expect the user to press a key to do alternate boot instead? Is there still a scenario for having the BIOS try multiple devices in a configured order?

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• Caching API Proxy Server

  - by edc1591

  I need to have a server that caches API responses and then forwards them along to a desktop app. I don't really have much experience with this, so I have a few questions. First of all, what kind of server should I get? I already use Linode for my websites, so ideally I'd like to go with them. I expect to get anywhere from 30 million to 40 million requests to my proxy server each month. Will a 512 Linode be able to support that? Also, is there any software out there that does this already, or will I have to write my own? The API responses are roughly 10 KB each on average, so doing the math, that's a lot of data each month. Should I just add more transfer to whatever server I buy, or can I somehow compress the API responses before sending them off to the user? Thanks for any help.

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• Maximum number of files in one ext3 directory while still getting acceptable performance?

  - by knorv

  I have an application writing to an ext3 directory which over time has grown to roughly three million files. Needless to say, reading the file listing of this directory is unbearably slow. I don't blame ext3. The proper solution would have been to let the application code write to sub-directories such as ./a/b/c/abc.ext rather than using only ./abc.ext. I'm changing to such a sub-directory structure and my question is simply: roughly how many files should I expect to store in one ext3 directory while still getting acceptable performance? What's your experience? Or in other words; assuming that I need to store three million files in the structure, how many levels deep should the ./a/b/c/abc.ext structure be? Obviously this is a question that cannot be answered exactly, but I'm looking for a ball park estimate.

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• Tape Supplier in Canada

  - by JohnyD

  I'm not sure if it's kosher to ask.. but where can one purchase good quality / well priced backup tapes within Canada, online? I'm asking because my current vendor, DataWrite, has sent me bad tapes for the 3rd time in a row. I have no idea where they get their product but when I put an order in for 20 tapes and 2 cleaning tapes and I have to call them up 4 times over the next 2 weeks, I expect those tapes to work. Well, like I said, this is the 3rd batch that I'm sending back and we've been dealing with them exclusively for well over 5 years so I thought I'd ask the pool of knowledge. I'm currently looking for DAT72 tapes but soon will be looking for LTO-3 and LTO-4. Thank you

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• Ctrl+Z and fg to append commands

  - by avilella

  I would like to know what is the behaviour of Ctrl+Z and fg in bash when wanting to append commands to be executed after a running command has finished. For example, in the sequence for commands below, I would expect the console to display "1", then "2", then "3", then "4", but I only get the last command, echo 4, after sleep 30 finishes: avilella@magneto:~$ sleep 30 && echo 1 ^Z [1]+ Stopped sleep 30 avilella@magneto:~$ fg && sleep 5 && echo 2 sleep 30 ^Z [1]+ Stopped sleep 30 avilella@magneto:~$ fg && sleep 5 && echo 3 sleep 30 ^Z [1]+ Stopped sleep 30 avilella@magneto:~$ fg && sleep 5 && echo 4 sleep 30 4 Any ideas?

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• Excel 2007 Conditional Formatting is not properly using custom formula provided

  - by Charles

  In Excel 2007, I want to conditionally color a row if it is odd numbered and then vary the coloring depending on if a specific cell (in column E) in that row contains a number (green) or empty(red). E.g. if E15 has a value of 2 and E13 has no entry, I would expect row 15 to be green and row 13 to be red. My two formulas are: To color red: =IF((MOD(ROW(),2) = 1),NOT(ISNUMBER(INDIRECT("$E$"&ROW()))), FALSE) To color green: =IF((MOD(ROW(),2) = 1),ISNUMBER(INDIRECT("E"&ROW())), FALSE) If I paste these formulas into cells on the worksheet I get the expected values. For row 15 the "red" equation is false and the "green" equation is true. For Row 13 the "red" equation is true and the "green equation is false. However if I use these formulas in the conditional formating use formula feature, all of my rows are red, any thoughts?

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• Running Windows 8 Consumer Preview to Pro

  - by elvispt

  Currently I have Windows 8 Consumer Preview installed I tried running the Windows 8 Upgrade Assistant, and it tells me, after checking for compatibility, that I can buy Windows 8 Pro for 29.99euros. Will I have any issues with this? Will I be able to perform a clean install from the downloaded file? I heard that I could not get Windows 8 Pro at this price, only If I had Windows 7 installed. The bottom line is, what kind of issues can I expect if I decide to go down this path? Will it ask me later for a key of Windows 7 to validate? Thanks.

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• VMware ESXi - vSphere - Can't exit VM console access

  - by caleban

  I'm running ESXi 4.1 on a Dell T110 Server I connect to ESXi using vSphere vSphere is running inside a Windows 7 VM The Windows 7 VM is running in VMware Fusion on my Mac OS X system When I'm in vSphere and I've selected a VM and I click the console tab on some systems the VM console won't release me when I press the control + command keys. pfSense (FreeBSD) and Ubuntu Server behave like this. I can't exit their console screen. I have to shut down these VM's to be released from their VM console access. Windows, Ubuntu Desktop, etc. all behave like I'd expect; When I press the control + command keys I'm released from the VM console and I'm able to navigate in vSphere. Does anyone know what might be causing this or a way around this? Thanks in advance.

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