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• Slow write speeds on new Gigabit home file server

  - by Ryan Holder

  So I finally got all my parts delivered to setup a home file/backup server this week. It's currently running Ubuntu Server and I'm using Samba to share files on my network. The server currently has a 2TB WD Green drive in it connected to a Asus M5A78L-M This is then connected via CAT6a to my new Gigabit switch (TP-Link TL-SG1005D). My home desktop is then also connected to this switch and again also through CAT6a cable. Currently when transfering files I will get a perfect 100MB/s read from the server to my Windows machine. When copying from my Windows machine to the server I get around 30/38MB/s. I know this drive is capable is faster speeds so would anybody have an idea of where the bottleneck is? Any help would be greatly appreciated :) EDIT: I have found ftp's write speed is much closer to what my Samba read speed is so I'm going to give it a guess that is a software problem rather than hardware

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• External Dell Display doesn't work with MacBook Pro (2011) after Thunderbolt Firmware Update (1.0 and 1.2)

  - by tom

  Today two Thunderbolt Firmware Updates (1.0 and 1.2) became available for my MacBook Pro (Early 2011). After installing both, my external monitor, a Dell U2713HM, does no longer work. The system detects the display, but the display shows only black. An Apple Thunderbolt display works fine and a MacBook Air can use the Dell monitor without problems. My MacBook Pro can use the Dell monitor just fine when I boot from a USB stick. Therefore, clearly the Thunderbolt Firmware Update seems to be the problem. Does anyone have the same problem? Any solutions or workarounds? I guess there is no way to remove a Thunderbolt Firmware Update once it's installed, right? Update 24.10.2013: Is there no one else with this problem? In the meantime I tried three different cables – none worked. My colleague with the same generation MacBook Pro also can't use my display after installing the firmware update. All colleagues with MacBook Airs and newer MacBook Pros (all didn't receive the firmware update) can use the display. Update 29.10.2013: Wow, ok today my new MacBook Pro Retina 13' (Late 2013) arrived. Guess what, I cannot use the display with it. Only HDMI works – not with the full resolution.

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• Adding file to /etc/cron.d doesn't make it run (ubuntu 10.04)

  - by tom

  If I scp a cron file into /etc/cron.d it doesn't run unless I edit the file and change the command. Then crond seems to pick up the cron file. How can I make cron reload its cron files in ubuntu 10.04? 'touch'ing the file doesn't work nor does 'restart cron' or 'reload cron'. My cron file is set to run every minute and logs to a file. Nothing ends up in the log file until I edit the command, and there's no entry for it in /var/log/syslog I'm stumped. Here's my cron file saved to /etc/cron.d/runscript # Runs the script every minute. This is safe because it will exit with success if it's already running * * * * * www-data if [ -f /usr/local/bin/thing ]; then exec /usr/bin/php /usr/local/bin/thing mode:prod -a 14 -d >> /var/log/thing/mything.log 2>&1; else echo `date +'[%D %T]'` "Thing not deployed. Command not run\n" >> /var/log/thing/mything.log; fi &

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• WPF Application from Visual Studio 2010 crashes Windows 7

  - by Tom

  Hello, I am using visual studio 2010 on Windows 7 64bit. I compiled and ran a simple application basically a thing a child could make. Well the second it started to run, it froze my computer and rendered it unresponsive. It continues to do this every time and for every application. Any ideas why this is happening?

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• What are the Windows G: through Z: drives used for?

  - by Tom Wijsman

  In Windows you have a C: drive. The first things labeled beyond that seems to be extra stuff. So my DVD drive is D: and if you put in a USB stick it becomes F:. And then some people also have A: and B:. But then, what and where are G: through Z: drives for? Is it possible to connect so many things to a computer to make them all in use? Or more than them? Would it give a BSOD? Or would this slow down the system somehow? Or what would happen? What if I want to connect even more drives to the computer? Because with the hard drive limits it's more efficient to buy more drives than to buy a single drive with a lot of capacity. Is it possible to create drive letters like 0: through Z: or AA: through ZZ:?

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• growing EBS RAID volume

  - by Ryan Fernandes

  I've created a RAID0 configuration with two 1GB EBS volumes, mounted at /dev/md0 using mdadm and formatted with XFS Next, I copied some files over to fill the volume to around 30% of its capacity (of 2GB) I then created snapshots of the volumes using ec2-consistent-snapshot and created volumes of the said snapshots but specified the volume size to be 2GB (effective doubling the capacity on each disk) I then spun up a new instance, assembled the RAID0 configuration on /dev/md0 from the 2 volumes mentioned above and mount it to /vol df -hT showed /vol as 2GB (as expected) Now I ran sudo xfs_growfs -d /vol. The command completed normally but reported blocks changed from 523776 to 524160 (only!) and df -hT still showed /vol as 2GB (instead of the expected 4GB) I rebooted, remounted, reassembled the RAID but it still reports the old size. EDIT: trying to grow the RAID using mdadm --grow yields mdadm: raid0 array /dev/md0 cannot be reshaped Is there any other way I can grow a RAID0 array?

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• MySQL database Int overflow and can’t login in.

  - by Ryan Smith

  I have a MySQL database on my server and I"m pretty sure it's an int over flow on one table with an auto_increment field that's crashing it. I can delete the table, it's not very important, but I can't get into the server. Is there anyway to delete that database from the file system or without logging into MySQL? HELP! THE WORLD IS ENDING!

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• Ubuntu 12.04 3.2 Kernel showing incorrect "cache size" in cpuinfo?

  - by Tom G

  2x Xeon E5620 . 16 Cores altogether. /proc/cpuinfo shows cache is only @ 4096kb According to intel this should have 12MB of "smart cache". Doing searched for E5620 and CPUinfo shows the correct number: cache size : 12288 KB However mine shows this: processor : 15 v endor_id : GenuineIntel cpu family : 6 model : 44 model name : Intel(R) Xeon(R) CPU E5620 @ 2.40GHz stepping : 2 microcode : 0x1 cpu MHz : 2400.104 cache size : 4096 KB fpu : yes fpu_exception : yes cpuid level : 11 wp : yes flags : fpu vme de pse tsc msr pae mce cx8 apic mtrr pge mca cmov pat pse36 clflush mmx bogomips : 4800.20 clflush size : 64 cache_alignment : 64 address sizes : 40 bits physical, 48 bits virtual Any idea on why it shows like it's missing 8MB in CPU cache? .

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• Windows 8 not booting from DVD while trying to install in a Ubuntu 14.04 system

  - by Tom

  Currently my system runs on Ubuntu 14.04. Yesterday, I deleted and formatted the partition(C drive) as NTFS in which Windows 7 was installed because Windows 7 was not booting for more than a week. I have a Windows 8 disk and it was able to boot from that disk when there was Windows 7 on my system. After the formatting of C drive yesterday, I tried to install Windows 8 by booting from the disk. Unfortunately, this time no booting happened from the disk. So I pressed F2 during the system start up and checked Boot Device Priority, Optical Drive has the first priority there. So why Windows 8 didn't boot from the disk ? I need to install Windows 8 too in my system without doing any damage to Ubuntu 14.04. How can I do it ?

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• Terminal command to change permissions to my 'Sites' folder and apply change to enclosed items?

  - by Ryan

  Using Snow Leopard, I'm having issues with permissions in my Sites folder. While I can navigate to localhost/~username and read any files or folders there, the same permissions have not been applied to enclosed items, and I get a 403 error trying to access them in the browser. If I select one of these enclosed folders and get info using Finder, I see the user 'Everyone' is set to 'No Access' but I can't change that (this behavior seems buggy, actually). And if I select my 'Sites' folder, the tool to 'Apply to enclosed items' is grayed out... Is there a Terminal command I can use to grant 'Read Only' access to my Sites folder, and all it contains, for the user 'Everyone'?

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• Why are some UDP packets getting blocked?

  - by Tom

  In our organization, we have two test machines running Windows XP. While attempting to test a roll-my-own UDP message server, I found that both could receive small messages (under 2k) just fine. However, when I test sending large packets to both of these machines, one receives them fine, while the other can't receive them at all. Both machines have SP3 and both have their Windows Firewall shut off, but one still isn't working. Can anyone tell me where to look for anything that might be blocking or limiting the packet size on a Windows Machine? Thanks.

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• Are there any good, free websites that can help you track Vehicle Maintenance?

  - by Ryan Shripat

  All I've found so far are a couple of windows applications - I wonder if there are any websites that allow you to track the maintenance of your vehicle.

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• Is it possible to use rsync over sftp (without an ssh shell) ?

  - by Tom Feiner

  Rsync over ssh, works great every time. However, trying to rsync to a host which allows only sftp logins, but not ssh logins, provides the following error: rsync -av /source ssh user@remotehost:/target/ protocol version mismatch -- is your shell clean? (see the rsync man page for an explanation) rsync error: protocol incompatibility (code 2) at compat.c(171) [sender=3.0.6] Here's the relevant section from the rsync man page: This message is usually caused by your startup scripts or remote shell facility producing unwanted garbage on the stream that rsync is using for its transport. The way to diagnose this problem is to run your remote shell like this: ssh remotehost /bin/true > out.dat then look at out.dat. If everything is working correctly then out.dat should be a zero length file. If you are getting the above error from rsync then you will probably find that out.dat contains some text or data. Look at the contents and try to work out what is producing it. The most com- mon cause is incorrectly configured shell startup scripts (such as .cshrc or .profile) that contain output statements for non-interactive logins. Trying this on my system produced the following in out.dat: ssh-dummy-shell: Command not allowed. As I thought, the host is not allowing ssh logins. The following link shows that it is possible to accomplish this task using fuse with sshfs - however it is extremely slow, and not fit for production use. Is there any chance of getting rsync sftp to work?

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• Force request to miss cache but still store the response

  - by Tom Marthenal

  I have a slow web app that I've placed Varnish in front of. All of the pages are static (they don't vary for a different user), but they need to be updated every 5 minutes so they contain recent data. I have a simple script (wget --mirror) that crawls the entire website every 15 minutes. Each crawl takes about 5 minutes. The point of the crawl is to update every page in the Varnish cache so that a user never has to wait for the page to generate (since all pages have been generated recently thanks to the spider). The timeline looks like this: 00:00:00: Cache flushed 00:00:00: Spider starts crawling to update cache with new pages 00:05:00: Spider finishes crawling, all pages are updated until 1:15 A request that comes in between 0:00:00 and 0:05:00 might hit a page that hasn't been updated yet, and will be forced to wait a few seconds for a response. This isn't acceptable. What I'd like to do is, perhaps using some VCL magic, always foward requests from the spider to the backend, but still store the response in the cache. This way, a user will never have to wait for a page to generate since there is no 5-minute window in which parts of the cache are empty (except perhaps at server startup). How can I do this?

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• Hidden features of Ubuntu

  - by Tom Brito

  That I know: In command line, use TAB to autocomplete the commands. You need just to select a text to copy it, and use mouse middle button to paste. Which other "untold" secrets Ubuntu hides? obs. I don't know which of the items I told are for any Linux or Ubuntu specific.

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• How can I make Excel correlate data from two data sets into a single graph?

  - by Tom Ritter

  I have two datasets, one being sparser than the other. They look like this: Data Set 1: 4 50 5 55 6 60 7 70 8 80 Data Set 2: 4 10 6 20 8 30 I have several hundred points instead of this few. I want them in the same graph, the X axis being 4-8, the y axis being 0-100ish, and two lines, one for each data set. What I get is two lines, not correlated at all along the X axis, and the X axis being labeled from one of the two datasets, with the labels being wrong for the other. The smaller data set is one-point-per-tick on the x axis, when I need it to skip ticks and actually line up with the other data set. Not married to excel, willing to try this in something else if it's free.

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• I just deleted "/bin". What's the best way to recover?

  - by Tom Marthenal

  I just ran (not on purpose!) rm -rf /bin. I've booted down the computer and am using Finnix to try to recover from it. I have succeeded in mounting the drive, and confirmed that, yes, the entire /bin folder is deleted. Is it possible to recover from this without reinstalling the OS? I'm thinking that I could setup a VM with the same OS and architecture (Ubuntu Server 11.10 alpha release, x86) and install all the packages I had installed on the server, then just copy the /bin folder. Will this work? Am I better off just starting over?

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• IP-restricted port forwarding with iptables

  - by Tom

  For an example, I have two authorized client computers, 1.1.1.1 and 2.1.1.1. My server running iptables is 3.1.1.1 and my firewalled web server is 4.1.1.1. When one of the authorized client IPs connects to 3.1.1.1 on port 80, I would like the connection to be forwarded to 4.1.1.1 on port 8888. If any other IP attempts to connect I would like it to refuse/drop the connection. What iptables config would accomplish this? Is there something more specific out there that would be better suited for this job?

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• Using watch with pipes

  - by Tom

  Hi! I'd like to run this command: watch -n 1 tail -n 200 log/site_dev.log | grep Doctrine But it does not run, because "I think" that the grep tries to run on the watch instead of the tail... Is there a way to do something like watch -n 1 (tail -n 200 log/site_dev.log | grep Doctrine) Thanks a lot!

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• Why am I experiencing random connection timeouts? (CentOS)

  - by Ryan

  I have a CentOS server setup that currently hosts several websites (all relative of each other in some form or another). As of recently throughout the day at the most random times the website speed will lag to a crawl and eventually hit a connection timeout. When I say random times this typically happens anywhere between 10am and 1pm usually, however, this morning this happened to me at 8am. I do not have a lot of familiarity with server knowledge as far as what I am looking for in this situation. What are some possible causes of why my server is slowing the websites down to a complete crawl or timing out? Are there specific things I should be checking for when this happens? I have noticed using: tail /var/log/httpd/access_log That usually when this down time occurs there are lot of IP addresses related to BingBot, Googlebot, and sometimes various bots or spiders that I am unfamiliar with. Could this be related and if so how can I avoid this from causing my websites to lag out? Thanks in advance for any help or advice. The websites that are timing out are built with PHP and use a MySQL database to display information.

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• Explorer.exe - No such interface supported and other issues

  - by tom

  The problem started when I uninstalled my ATI graphics driver and i used a driver cleaner. After i restarted win7 and it got to POST the screen just went completely blank. So i Used system restore from the repair menu to get back on. I found out that if I ran chkdsk the display just goes black after restart on startup and i have to use system restore to get back on windows7 not sure why this is. When i right click desktop and choose 'Screen Resolution' it says No such interface supported. Also when I click items such as device manager in the windows explorer it does not do anything. I have tried re-registering the DLLS but that did not do anything.

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• Which program is locking all my executable files?

  - by Tom Wijsman

  When updating any software product, as well as manually trying to replace .exe files, it says that access is denied to the file and in fact the System process is holding a handle to the file when I check it with Process Explorer. This must be a driver or something that is malfunctioning was my first though, but now I wonder how I figure out which driver / program is doing this and why it is so. Unlocker doesn't seem to be working for me, unless someone can tell me how to use it properly other than making it appear a magical wand in the notification area.... This is what Unlocker puts in my event log: The description for Event ID 1060 from source Application Popup cannot be found. Either the component that raises this event is not installed on your local computer or the installation is corrupted. You can install or repair the component on the local computer. If the event originated on another computer, the display information had to be saved with the event. The following information was included with the event: \??\C:\Program Files (x86)\Unlocker\UnlockerDriver5.sys the message resource is present but the message is not found in the string/message table Upon searching event 1060 I get: <file name> has been blocked from loading due to incompatibility with this system. Perhaps it is because I have 64 bit?

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• How can I start any application with Guest permissions by default?

  - by Tom Wijsman

  Here are my two questions: How can I start any application with Guest permissions by default? How can I set certain applications not to launch with Guest permissions? For the first bullet, any non-Microsoft signed application I launch should run as the Guest account. For the second bullet, I'm imagining adding menu entries like this would be a nice approach: Set to run as Guest (= default selected entry) Set to run as User Set to run as Admin But how do I do this?

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• Service or software to auto-sync one server to another so they are identical?

  - by Ryan

  We have a main node in a DC data center and want to setup a back-up node in Seattle. The back-up node will only be used if the DC node goes down and we switch it over while DC node is repaired. The question is, what kind of services out there allow me to sync the data, I suppose we want to do it fairly frequently so if something goes down there isn't much loss in data between the time of failure and the last back-up/sync. Is there any common solution for this? It's Windows Server 2003 running Parallels Virtuozzo.

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• What do you think iPad is util for?

  - by Tom Brito

  "Ultimate browsing experience" apart, what can you say iPad is util for?

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