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  • Page cache flushing behavior under heavy append load

    - by Bryce
    I'm trying to understand the behavior of the Linux pdflush daemon when: The page cache is initially pretty much empty There is a large amount of free memory The system starts undergoing heavy write load My understanding right now is that the vm.dirty_ratio and vm.dirty_background_ratio that control page cache flushing behavior are with respect to the present size of the page cache, which means that my writes will flush earlier than they would if the page cache was pre-populated (even with dummy data from some random file), and thus throughput will be lower. Is this accurate?

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  • where on disk is space allocated for new files inside LVM lv with ext4 file system?

    - by Jost
    I run a multi-disk server with LVM2. Several large disks serve as LVM2 physical volumes for one volume group, containing one logical volume formatted with ext4. Nothing fancy, just your standard linear setup. Recently an additional, very small disk was added as physical volume to that volume group and I expanded both the logical volume, and the ext4 file system therein onto that disk. This lv is used to store incremental backups using rsync and is only about 30% full, there have rarely been any files deleted from it, only incremental writes. Now this new HDD I added to the pre-existing volume group has unexpectedly died on me, and the volume group won't come up because it is missing one physical volume. As fate will have it, this WAS the "in an event of catastrophic failure on the primary server"-backup, the event happened, the boss is not happy, so this kinda has to work... According to this (Part 3): http://www.novell.com/coolsolutions/appnote/19386.html it is possible to trick LVM into starting anyway by creating a new pv with identical metadata to the failed disk, which will make the volume accessible, but of course leave giant holes in the file system. I have'n tried it yet, because it involves repairing (writing to) the file system which eliminates the possibility of trying other things if it fails. Now my question is: How does this setup actually allocate disk space for new data? Is it allocated linearly from beginning to end of PVs, in the order they were added to the vg? Is it striped somehow in order to increase performance/balance load? since this defective disk was added only later to an existing lvm2 vg and lv, containing a half-empty ext4, what are the chances that there was never any data written to the defective disk? In other words: what are the chances of recovering all my data, even without the defective disk, by just starting the volume group as-is? Am I about to go spend $1500 on having 250GB of empty space recovered when I send the defective disk in for repair? Is there a way to check without mounting the file system and opening the files, hoping they contain something other than zeros? (comparing addresses of used data blocks inside ext4 to address ranges that were on the missing pv, something like that, preferably easy to automate) I know bitwise-copying the entire lv into an image file before trying to repair the ext4 would probably be a good idea, but since this lv is very large and I just suffered major file system failure on several systems it is probably a luxury I don't have... Any suggestions?

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  • Tool to automatically combine many large pivot table in many large Excel sheet ?

    - by Sim
    Hi all, We have several Excel files that contains large pivot data table with the same structure For example File A Pivot table (Field A, B, C) File B Pivot table (Field A, B, C) We want to combine them into 1 pivot table (A, B, C). Just want to know which ways we can do it ? Manual way : open a new empty sheet, copy and paste the pivot there and create the pivot again Automatic way : is there some tool that did this ? Thanks

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  • Could you share your emacs dot-files for web development

    - by Gok Demir
    Hi, could you kindly share your emacs dot-files for web development that works with CSS, HTML, JavaScript, PHP and if possible with Python Django. I really need complete setup. I looked nXhtml and its good on some parts (html code completion works but sucks on indentation and CSS code completion does not work and says tag table is empty most cases. I really need something that works: code completion works out of the box, git integration and pretty indentation and supports multi-mode for mixed HTML, CSS, JavaScript, PHP code.

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  • DVD drive doesn't recognize blank dvds only!!!

    - by Jack
    My dvd-rom works fine because I can play dvds on it, however when the dvd is a blank one the drive refuses to recognize it. So I can't burn dvds anymore because the drive shows up as empty in my disk burning software (dvd flick). Any idea what the problem is and how to solve it? PC: Windows vista home basic, 32 bit

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  • in Open Office Calc, how do I drag and drop cells to insert rather than replace their destination?

    - by joachim
    I want to rearrange rows with the mouse in Calc. In Excel, I select the whole row, then drag and drop it while holding SHIFT. This causes the drag and drop cursor to turn into a bar rather than cells, and the cells are inserted at the bar's position. Is there a way to accomplish the same sort of thing in Calc without going round the houses inserting columns before the drag operation?

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  • PHP ignores upload_tmp_dir?

    - by Matthias Vance
    LS, I am using IIS7 with PHP (FastCGI). I set up the upload_tmp_dir to "X:\Temp" instead of leaving it empty, but it's still using "C:\Windows\Temp" for some reason. I did give the following users full rights : NETWORK SERVICE, , IIS_IUSRS. I also restarted IIS after I made the change. Kind regards, Matthias Vance

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  • Where does $PATH get set in OS X 10.6 Snow Leopard?

    - by Andrew
    I type echo $PATH on the command line and get /opt/local/bin:/opt/local/sbin:/Users/andrew/bin:/usr/local/bin:/usr/local/mysql/bin:/usr/local/pear/bin:/usr/bin:/bin:/usr/sbin:/sbin:/usr/local/bin:/usr/X11/bin:/opt/local/bin:/usr/local/git/bin I'm wondering where this is getting set since my .bash_login file is empty. I'm particularly concerned that, after installing MacPorts, it installed a bunch of junk in /opt. I don't think that directory even exists in a normal Mac OS X install. Update: Thanks to jtimberman for correcting my echo $PATH statement

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  • rkhunter not using root external email on ubuntu

    - by Zen
    i have installed rkhunter on ubuntu 10.04 LTS when i try to test rkhunter report it doesn't send email to my external root email recipient. i can send email only editing /etc/default/rkhunter by replacing this row REPORT_EMAIL="root" with the desired recipient REPORT_EMAIL="[email protected]" These are my config file settings: /root/.forward [email protected] and /etc/aliases root: [email protected] But it doesn't work with root recipient. Any suggestion?

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  • Excel 2013: Is it possible to collapse rows only in a specific column?

    - by h7u9i
    In my spreadsheet, I'm trying to figure out a way to collapse rows in a specific column. Right now, if I do Data - Group - Group... - Rows, it'll collapse the entire row. I want to collapse rows only in a specific column. Example: |---------|----------| | hi | + data | |---------|----------| | hello | + data2 | |---------|----------| | | | |---------|----------| | | | And opening data 1 would turn into: |---------|----------| | hi | - data1 | |---------|----------| | hello | point1 | |---------|----------| | | point2 | |---------|----------| | | + data2 | |---------|----------| | | | |---------|----------| | | | Is this possible to do in Excel?

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  • JDownloader: lost my queue

    - by Fuxi
    hi, unfortunately my jDownloader crashed and my queue is empty. i've googled already and unzipped the database.zip into the config dir - but didn't help. any ideas how to get my queue back? thx

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  • RAID for a home PC

    - by Mennon
    I have a home PC with two identical physical drives (SATA), ASUS P5Q-EM motherboard and Windows 7. HDD 1 has two partitions C: and D:, Windows is installed on C: and everthing else is on D:. Now the task is to organize some kind of RAID to mirror all data from HDD 1 to HDD 2 (at the moment HDD 2 is empty, no partitions), so HDD 2 is a backup copy of HDD 1. I've never had chance before to work with RAID, so any suggestions would be greatly appreciated.

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  • RAID for a home PC

    - by Mennon
    I have a home PC with two identical physical drives (SATA), ASUS P5Q-EM motherboard and Windows 7. HDD 1 has two partitions C: and D:, Windows is installed on C: and everthing else is on D:. Now the task is to organize some kind of RAID to mirror all data from HDD 1 to HDD 2 (at the moment HDD 2 is empty, no partitions), so HDD 2 is a backup copy of HDD 1. I've never had chance before to work with RAID, so any suggestions would be greatly appreciated.

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  • How do i setup a Window server 2008 R2 + SQL server 2008 VPS ?

    - by Spencer Lim
    I wish to deploy a trusted apps at the secured way... i got one empty VPS (no operating system) but i don't know how could i install Window server 2008 R2 and SQL server 2008 the version i got is genuine enterprise/ datacenter and sql enterprise the main purpose is used to deploy ASP.Net v4 MVC 2 and XBAP Apps + LINQ also use SQL server for my window application with someway to make it able to remote access May i know anyone here could teach me or introduce some source for me on how to setup the domain, IP, OS and feature all thing, please... i felt confuse here @.@

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  • Snapback in Firefox

    - by Casebash
    In my address bar, on the left of the star, there is an option Snapback: [Empty] for every site. I haven't seen this before and I don't have the Snapback plugin. Doesn't anyone know where it may have come from and what it does? I recently upgraded to 3.5.6 on Ubuntu, and may have had some plugins upgraded, but not sure which. I have a ridiculous number of plugins on this comp otherwise I could just try disabling them one at a time.

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  • Enabling login logging in Ubuntu 9.10

    - by Sopa Christian
    On a Ubuntu 9.10 system: $ uname -a Linux ionut-laptop 2.6.31-14-generic #48-Ubuntu SMP Fri Oct 16 14:04:26 UTC 2009 i686 GNU/Linux the files /var/log/wtmp and /var/log/btmp are empty: $ ls -la /var/log/?tmp -rw-rw---- 1 root utmp 0 2010-04-10 16:54 /var/log/btmp -rw-rw-r-- 1 root utmp 0 2010-04-10 16:54 /var/log/wtmp Because of this, the last(1) command is not working. What to do?

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  • how to get a udp response with netcat

    - by dihlofos
    Hi, everyone I'm trying to do something like: echo "request" | nc -u 1.1.1.1 9999 > response.txt I can see that response is comming from server (with tcpdump) after executing this line. However, my response.txt stays empty. Is there a way to get it? Thanks in advance

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  • Control Panel Win 7 ??????

    - by kiiboodo-oni
    Everytime i try to make a Shortcut folder for Control Panel it comes up empty, I'm using ::{26EE0668-A00A-44D7-9371-BEB064C98683}\0 as the path. Is there an actual folder with shortcuts that i can use? BTW im running Win7 7600

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  • Having troubles connectiong Magento to external Windows Database Server using Windows Azure

    - by Kevin H
    "I tried to make this easy to read through" I am using Ubuntu 12.04 LTS for Magento and installed these commands onto the system: sudo apt-get install apache2 sudo apt-get install php5 libapache2-mod-php5 sudo apt-get install php5-mysql sudo apt-get install php5-curl php5-mcrypt php5-gd php5-common sudo apt-get install php5-gd I used Windows Server 2008 R2 August 2012 for Mysql Server For a reference, I used http://www.windowsazure.com/en-us/manage/windows/common-tasks/install-mysql/ When the server was setup, I added an empty disk to it Then, I added endpoints 3306 Next I accessed the server remotely After that, I formatted the empty disk and was inserted as F: Next I downloaded Mysql from http://*.mysql.com version Windows (x86, 64-bit), MSI Installer 5.5.28 In the installation process, I used these settings: Typical Setup - Clicked Next, install, next Chose Detailed Configuration - Clicked next Chose Dedicated MySQL Server Machine - Clicked Next Chose Transactional Database Only - Clicked Next Chose the "F:" Drive - Clicked Next Chose Online Transactional Processing (OLTP) - Clicked Next For Networking Options, I checkmarked 'Enable TCP/IP Networking" 'Add firewall exception for this port' 'Enable Strict Mode' - Clicked Next Chose Standard Character Set - Clicked Next For Windows Options, I checkedmarked 'Install as Window Service" 'Launch the MySQL Server automatically' 'Include Bin Directory in Windows PATH - Clicked Next For Security Options, I checkmarked 'Modify Security Settings' and set root password - Clicked Next Finally clicked Execute and Finish These are the Firewall Setting that I set I clicked inbound rules Properties Scope Allow IP Address and used the internal Address for Magento Server Clicked Apply and exited Next, I opened up MySQL 5.x Command Line Client Entered Root Password Then entered these commands mysql create database magento; mysql Create user magentouser identified by 'password'; mysql Grant select, insert, create, alter, update, delete, lock tables on magento.* to magentouser mysql exit Finally, I opened up the Magento Downloader Magento validation has approved all PHP version is right. Your version is 5.3.10-1ubuntu3.4. PHP Extension curl is loaded PHP Extension dom is loaded PHP Extension gd is loaded PHP Extension hash is loaded PHP Extension iconv is loaded PHP Extension mcrypt is loaded PHP Extension pcre is loaded PHP Extension pdo is loaded PHP Extension pdo_mysql is loaded PHP Extension simplexml is loaded These are all installed on Magento Server For the Database Connection, I used: The Database server only has MySQL 5.5 Server installed on it Host - Internal IP address User Name - The User I created when setting up database Password - The Password I created when setting up database For the password, I did some research and found out that Magento only accepts alphanumeric, so I went and set it up again and used only alphanumeric for the User password Now, I am still getting Accessed denied for database Connection. Also, I have tryed to setup mysql on independant Linux Server but kept getting errors. When, I found the solution. Wouldn't work, so I decided to try Windows. These is the questions, I have been asking and researching to debug this issue Is it because I am using Linux for magento and Windows for Database. I have had no luck in finding a reason why this wouldn't work There must be something, I am missing I also researched the difference between linux sql databases and windows sql databases but have not come to conclusion, if installing Mysql on windows would make a difference in syntax and coding. I have spent a lot of time looking into this and need some help with direction on how to complete my project. Any type of help would be appreciated.

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  • No password mysql under linux?

    - by ripper234
    I was told that mysql user, similar to root user, by default "has no password". Not an empty password, but rather "no password". I wasn't aware this situation was possible - I thought every user on a linux had to have a password. Am I wrong? Can you point me to a link that explain this?

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