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• Tuning MySQL to consume less memory

  - by Alex

  I have a VM which has 2GB Ram, (full specs) And I am setting up a site which has one table in particular with over a million records. There's little or no usage of this particular database (perhaps once or twice a day) but simply running mysql grinds the whole server to a halt. I've looked through the top results but nothing is really denting the CPU however the memory seems to be the issue. The site isnt even live of taking requests yet. the memory situation looks like this: # free -m total used free shared buffers cached Mem: 2006 1880 126 0 3 53 -/+ buffers/cache: 1823 183 Swap: 2047 345 1702 Are there any good pointers to tune mysql to stop hogging the system memory? Thanks very much EDIT: (requested by 8bit): http://tny.cz/b41a0b12

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• About Hard Disk Drive Docks

  - by Crossbrowser

  I'm thinking of buying a drive dock to put my unused large HDD to use. I will also probably use the dock to backup files and swap the drives regularly. I have a few questions though: Are they noisy? I plan to use them via USB (because I don't think I have eSata connectors), am I gonna want to kill myself every time I backup? (I know it's supposed to be 480 Mbps, but how realistic is this?) Do you recommend a particular model? (I was thinking about this Startech HDD dock) Thank you

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• Editor that supports renaming tabs for untitled docs?

  - by OverTheRainbow

  I sometimes need to copy/paste text into two windows and compare the contents for a quick hack, ie. without having to save both documents to disk, and display the two docs side-by-side vertically so I can scroll them independantly (WinMerge doesn't seem to support independent scrolling.) Since the documents only live in RAM, text editors will display a non-descript tab/filename like "Untitled1" or "New file 1": http://img171.imageshack.us/img171/1153/sidebysideunleddocs.jpg Does someone know of a Windows editor that supports... renaming tabs with more descriptive names even with documents that haven't been saved to disk, side-by-side, vertical tiling, and independant scrolling? Thank you.

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• Free / Cached / Available memory on Linux

  - by pkoraca

  I have read that linux uses free memory for caching, to make system faster. However, both Nagios and Paessler PRTG monitoring system show me that my memory usage is critical. I could change Nagios mem_usage script to sum free and cached memory, but would that be correct information? I doubt that they misunderstood Linux memory usage. Lets say I have 8 GB RAM. 5 GB are used, 2 GB is cached, and I have 1 GB of free memory. Real available memory should be free+cached (3 GB)? If some new application would need additional 3 GB RAM, could it take everything from cache and free without using swap, or is there a minimum that should be in cache? Real example: $ cat /proc/meminfo MemTotal: 5984256 kB MemFree: 137052 kB Buffers: 140484 kB Cached: 3439616 kB SwapCached: 244 kB Active: 3148824 kB Inactive: 2341768 kB ... My monitoring tools show that I have 137 MB free RAM, however I have ~3,5 GB in Cache. Thanks!

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• Replacement for NIS/YP

  - by mdpc

  The company that I am working for is embarking on replacing the current locally developed NIS/YP structure with LDAP. We already have AD in house for the Windows stuff and would like to consider using an AD system. The AD people are quite restrictive and would not support extensive modifications. We have needs to have the replacement include the support the full capabilities of the NIS/YP suite include netgroups, login restrictions to specific servers for specific users or groups of users, consistent passwords between the *nix and Windows environment,etc. Our environment is a mixture of Linux (suse, RH, Debian), Sun, IBM, HP and MPRAS as well as a NETAPP. So whatever we use must be totally inclusive to all environment. We have looked at Likewise, but our management wants other alternatives to compare with. What other things should I be looking at and what is you assessment of the alternative? Thanks

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• Conditional Lookup in Excel

  - by Keyslinger

  I want to use excel to compare pairs of numbers from the "Pre/Post" column of the following data: Student Course Pre/Post Score K300997203 FHS120100417 Pre 3 L286197217 FHS120100417 Pre 5 S106497203 FHS120100417 Pre 4 K300997203 FHS120100417 Post 4 L286197217 FHS120100417 Post 4 S106497203 FHS120100417 Post 4 S106497203 FHS220100424 Pre 4 Specifically, I want a cell to contain the difference of the value in the "Score" column where "Pre" and "Post" appear, respectively, in rows with the same value in the "Student" and "Course" columns. For example, Student K300997203 has a row containing Course FHS120100417, a score of 3, and "Pre" AND Student K300997203 has a row containing Course FHS120100417, a score of 4, and "Post". How can I calculate a cell value as the score in the row containing "Post" minus the score in the row containing "Pre"?

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• SSD runs faster on Windows as compared to Linux [closed]

  - by wushugene

  Windows 7 seems to install, boot and run much smoother & faster than each the three linux distros I have recently tried (Ubuntu 12.04 unity, Linux mint 13 MATE, and Fedora 17 on gnome 3.4). Why am I facing bad performance in Linux? I have tweaked my Linux installs for the SSD (enabling trim, disabling swap, etc.) I'm using an Acer TravelMate with i5-2410m processor, intel hd 3000 graphics, 8 gigs of ram, and a 256 gb samsung 830 ssd. Edit: Boot times are 10-15 seconds slower, there is noticeable delay from login to fully loaded desktop, and in general does not appear to be as responsive as my old windows 7 install or the Linux guests I had running on it.

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• How can I connect to some old Sun servers?

  - by hellsgate

  We have some old Sun servers (V125, V210, V240, T2000 amongst others) sitting unused and I've been asked to find out if there is anything useful on them before they get wiped and disposed of. However, I've been unable to connect to any of the servers. I tried connecting the servers to a router using the Net Management, Serial Management and standard Ethernet ports. When doing this, I ran 'nmap -sP' from my Linux desktop before and after connecting a server so I could compare the two outputs and hopefully work out what IP address had been assigned to the server, but it didn't appear to have received one. Unfortunately only one of the servers has a VGA output. I was able to access this machine as we still have the login details stored in KeePass, but I've no idea at the moment on how I should go about connecting to any of the others. Any suggestions?

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• How to force Windows to call the partition it installs on C:?

  - by maaartinus

  I'm going to install Windows XP from a CD and want to make sure it calls the partition it lands on C:. The target partition is the first one on a SATA disk, which is not the first one in my computer. There's no IDE disk there. I don't think I can swap the disks, as I'm using a fake RAID and really don't want to get problems with it. The target partition is on a normal disk. I know it may be unimportant, but I don't want to run in any problems I can avoid. I've seen a question slightly related to it, but I'm not going to install from a USB.

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• Get Zipped Logs from a Remote Server

  - by Jonathan

  I am tasked with trying to find a way to download zipped logs from a remote server. There are quite a bit of these logs and they are constantly created. I do have limited ssh access to the remote server and can scp or rsync the files. However, due to the sheer size of these logs file, I do not want to rsync all of them. The logs could get to terabytes and for rsync to compare them may take some time. I only want to get any new file that was created/last updated an hour ago. I also am worried that I will rsync logs that are in the process of being created, so I was thinking to only rsync files that were last modified 3-5 minutes ago. Would anyone be so kind as to help me with such a process? Thank you in advance.

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• How to clear the REPLACEBATT state from APC UPS after hot-swapping the battery

  - by Hubert Kario

  I replaced a battery in APC SmartUPS by hot-swapping. While the swap was all right and didn't disturb connected computers, the "Battery failed" LED on the front face kept glowing. I tried to use apctest from apcups package. Turned off the daemon and run self test (first changing BATTDATE in EEPROM). The test run fine but didn't clear the REPLACEBATT status or the glowing LED. How to clear the failed battery state without powering the UPS and connected equipment down?

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• Why does CentOS Linux use cpu/core #1 so much more in a 4-core system?

  - by ck_

  I've been watching top and htop for awhile on a very active server and I am wondering why linux does not automatically use cpu affinity better? CPU #1 (actually core #1 of 4) is used much more heavily than the others. Is there a setting similar to what vm.swappiness does for vm swap that forces a preferred affinity pattern? Should I be using forced affinity settings within mysql/apache/nginx/exim to get better results? This is on CentOS 2.6.32-279 x86_64 SMP Thanks for any suggestions.

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• Remapping button numbers on a five button mouse on Mac (or alternative solution?)

  - by Ollie G

  Is this possible? I have two mice connected at once (one on each side, so I can swap hands to help ease RSI). One is a 5 button mouse, the other 3 buttons. I like to set the 3 button's third button to Mac's expose, but the button I'd like to use for this on the 5 button mouse is the fifth button. Is it possible to change the fifth button to the third on this mouse? Or could you suggest an alternative solution? Thanks.

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• If a change the CPU, must I reinstall the OS?

  - by dag729

  Hi, as suggested by the title, I want to change CPU: actually I have two computers, one with Ubuntu running on an AMD Athlon 64 dual core 5200+ and the other with FreeBSD running on an AMD Sempron single core LE-1250. I would like to swap (I am not sure that this is the correct term...) the CPUs from one computer to the other one, that is take the dual core from the ubuntu pc and put it inside the freebsd pc and viceversa. The mobo is the same. Do you think I will encounter problems?

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• Where is the list of available Windows locales?

  - by Richard Cotton

  If you open the Regional and Language Options (via Control Panel), and click on the Regional Options tab, then there is a drop down list of all the available locales. Where is this list populated from? (I want to compare the settings for each locale; I'm fine with how to do that, but I need a list of locale names to loop over.) EDIT: After browsing through my windows directory (should probably mention I'm using XP), the file C:\WINDOWS\system32\locale.nls looks like a plausible candidate, but it's a binary file. Is this what I should be looking at, and if so, how do I read it?

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• Python: how to calculate data received and send between two ipaddresses and ports [closed]

  - by ramdaz

  I guess it's socket programming. But I have never done socket programming expect for running the tutorial examples while learning Python. I need some more ideas to implement this. What I specifically need is to run a monitoring program of a server which will poll or listen to traffic being exchange from different IPs across different popular ports. For example, how do I get data received and sent through port 80 of 192.168.1.10 and 192.168.1.1 ( which is the gateway). I checked out a number of ready made tools like MRTG, Bwmon, Ntop etc but since we are looking at doing some specific pattern studies, we need to do data capturing within the program. Idea is to monitor some popular ports and do a study of network traffic across some periods and compare them with some other data. We would like to figure a way to do all this with Python....

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• Why does deleting from the command line take significantly less time than from a GUI?

  - by Jordan Plahn

  So this is probably the dumbest question you'll read today, but it's something I just wondered about as I was deleting a dozen or so images from my computer. With a quick rm -rf command on the directory's contents, all the images were gone in a snap. When I drag the same dozen or so images to a trash can/recycle ban, it takes sometimes 10 seconds or more. Now I'm sure some of it comes from the overhead of the GUI and such, and some of it may be the fact that the file still "exists" in some form if it's put into the recycle bin, but is there anything else that accounts for such a huge time disparity? Are "rm" and "delete" just such fundamentally different commands so I'm trying to compare apples and oranges? Enlighten me, please!

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• Why is my wireless so slow compared to my wired download speed?

  - by Shawn

  I just used speedtest.net (using Firefox) to compare my wired connection speed with my wireless connection speed. With my current contract (with Videotron), I'm supposed to get Download speed: 8Mbps Upload speed: 1Mbps Here are the results of the speedtest.net test: Wired Ping: 14ms Download speed: 8.41Mbps Upload speed: 1.04Mbps Wireless Ping: 16ms Download speed: 0.18Mbps Upload speed: 0.98Mbps The difference in download speeds seems staggering to me since I did the test 1 meter aways from my router. Any clue as to why my wireless download speed is so low compared to my wired download speed? using Ubuntu 11.04 on an Acer Aspire 5536-5519 Oh and it might be worth mentioning that my girlfriend has no trouble at all with her wireless connection. No slowness at all. (She uses Firefox on Windows 7 on a Dell) Here's the results for the same test on her system: Ping: 22ms Download speed; 8.44Mbps Upload speed: 1.02Mbps

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• how to access a mounted device, How can I access the partitions with the console

  - by user1796624

  Hi I'm new to ubuntu and linux so this might be a very begginers question. I have several partitions on my pc and I want to be able to access them with the console. When I type: sudo fdisk -l I get: /dev/sda1 * 2048 97656831 48827392 7 HPFS/NTFS/exFAT /dev/sda2 97656832 234375167 68359168 7 HPFS/NTFS/exFAT /dev/sda3 * 234375168 312500223 39062528 83 Linux /dev/sda4 312502270 625141759 156319745 5 Extended /dev/sda5 312502272 318359551 2928640 82 Linux swap / Solaris /dev/sda6 318361600 625141759 153390080 83 Linux But it seams that the address is existing. for example I cant do cd /dev/sda4. How can I access the partitions with the console?

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• HD Radeon 6950 cannot run multiple monitors

  - by Bryan S.

  I'm having troubles getting multiple monitors to run on my graphics card. I plug one via the hdmi, and one into the DVI (I have tried both available DVI ports). with one DVI port it does not even register the monitor, with the second one I go into the Catalyst Control Center and it gives me the option to swap between the HDMI and the DVI port. I guess since this is the flex edition I could just go get 2 DSP to HDMI converters, plug 2 monitors in through the available DSP, and than the 3rd one into the HDMI, but do you have any idea why it will not let me run one HDMI and one DVI?

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• URGENT: help recovering lost data

  - by Niels Kristian

  I have made a directory: sudo mkdir /ssd, the directory was supposed to be mounted to a raid array called md3. This was done by adding /dev/md3 /ssd auto defaults 0 0 to fstab. Then after a while where I had used the directory, I realized that I had forgotten to run sudo mount -a - and then I did, and now the data is gone. I tried to uncomment the line in fstab and run sudo mount -a but that didn't get back my data. What can I do!? CONTENT OF FSTAB: proc /proc proc defaults 0 0 none /dev/pts devpts gid=5,mode=620 0 0 /dev/md/0 none swap sw 0 0 /dev/md/1 /boot ext3 defaults 0 0 /dev/md/2 / ext4 defaults 0 0 /dev/md3 /ssd auto defaults 0 0

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• Can you have a staging and production slot in Azure Websites

  - by Barry King

  I'm looking at hosting 3 Websites (there will all use the same linked database resource but I think I have to use 3 websites within Azure for this); www.website.com, provider.website.com and admin.website.com. Using Windows Azure Websites, can you have a Staging, Production slot? I think this feature is only available to Azure Cloud Services but there is little documentation on this. If its not possible, other than spinning up 3 more sites to act as the staging sites is there another way? I want the ability to "swap" from staging to production.

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• Re-cased my computer now the power plug keeps shorting

  - by dunc

  I've just re-cased my computer. I got the new case free and thought I'd be able to swap everything over myself but apparently I've done something wrong. I'm OK with components generally but wasn't totally confident about doing this. So, my question is, when setting up a new PC or moving old components into a new case, what could I have done which causes the power cable plug to short/fuse when I plug it in?. Is this likely to be an issue with the cables from my PSU, or could it be the internal case connectors? What steps would you take to diagnose the problem? I'd rather not start again if I don't have to...! Thanks in advance,

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• Partition and mount my secondary hard drive on CentOS 5.5 64bit?

  - by Andrew Fashion

  I am trying to prepare my second hard drive for user image uploads. Here is the current layout: # sudo parted /dev/sda print Model: ATA WDC WD2500KS-00M (scsi) Disk /dev/sda: 250GB Sector size (logical/physical): 512B/512B Partition Table: msdos Number Start End Size Type File system Flags 1 32.3kB 107MB 107MB primary ext3 boot 2 107MB 8595MB 8488MB primary linux-swap 3 8595MB 10.7GB 2147MB primary ext3 4 10.7GB 250GB 239GB extended 5 10.7GB 250GB 239GB logical ext3 Information: Don't forget to update /etc/fstab, if necessary. I am assuming #4 is my secondary drive? How do I partition and mount it so I can begin using it? And how do I add to fstab? I understand if it's to many questions in one, just help me with whatever you can I guess :) Thank you for any help!

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• RAID setup for maximizing data retention and read speed

  - by cat pants

  My goals are simple: maximize data retention safety, and maximize read speeds. My first instinct is to do a a three drive software RAID 1. I have only used fakeraid RAID 1 in the past and it was terrible (would have led to data loss actually if it weren't for backups) Would you say software raid 1 or a cheap actual hardware raid card? OS will be linux. Could I start with a two drive raid 1 and add a third drive on the fly? Can I hot swap? Can I pull one of the drives and throw it into a new machine and be able to read all the data? I do not want a situation where I have a raid card fail and have to try and find the same chipset in order to read my data (which i am assuming can happen) Please clarify any points on which it sounds like I have no idea what I am talking about, as I am admittedly inexperienced here. (My hardest lesson was fakeraid lol) Thanks!

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