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  • How to make a btrfs snapshot?

    - by MountainX
    My /home partition consists of an entire physical disk. It is formatted as btrfs. I want to snapshot it. I'm confused regarding subvolume naming, in particular. I am aware that there are similar questions, but each similar question seems to be asking something different from what I'm asking (and they are older, which means probably outdated, given the rapid development of btrfs). For example, the answer to this question is apparently not the answer to my question because my /home partition is a separate volume and the man page for btrfs shows a different command for creating snapshots now. another similar problem, no solid solution. someone else as confused as me on the naming issues My question: Starting simple: is this the correct command to take a simple snapshot of my home partition? btrfs subvolume snapshot /home/@home /home/@home_snapshot_20120421 I got really brave and tested it and it does not work. The error is error accessing /home/@home. As shown below, @home is listed. I'm obviously confused on subvolume names. Do I need to use them in creating snapshots? Some examples show taking snapshots of home using /home as the source parameter, but based on examples of root volumes, it seems to me that I need to use /home/@home. Would this command work? And if not, why? btrfs subvolume snapshot /home /home/@home_snapshot_20120421 Is the @ just a naming convention? Is it meaningful at all? Here's some output that may be relevant: btrfs subvolume list /home ID 256 top level 5 path @home I'm not sure what that means, exactly. When I try btrfs device scan it gives an error (e.g. unable to scan the device /dev/sda1). My file system doesn't have any errors. Everything is fine.

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  • How do I copy an existing hard disc to a new one so I can boot off the new disc?

    - by Brian Hooper
    I currently have a failing hard drive which is the only hard drive in the machine. I have just bought a new hard drive to replace it, and my plan is to copy the contents of the old drive onto the new one, and then replace the old drive in the machine with the new one. I presumably can't just copy the whole directory structure (or can I)? What do I need to do to manage this, assuming it is possible? Is there a utility to do this for me? (The old drive is hopefully good for a few more hours.) (I hope by this means to keep all the software and configuration files as they are, to avoid having to re-install everything. Can that be done?)

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  • How migrate my keyring (containing ssh passprases, nautilus remote filesystem, pgp passwords) and network manager connections?

    - by con-f-use
    I changed the disk on my laptop and installed Ubuntu on the new disk. Old disk had 12.04 upgraded to 12.10 on it. Now I want to copy my old keyring with WiFi passwords, ftp passwords for nautilus and ssh key passphrases. I have the whole data from the old disk available (is now a USB disk and I did not delete the old data yet or do anything with it - I could still put it in the laptop and boot from it like nothing happened). On the new disc that is now in my laptop, I have installed 12.10 with the same password, user-id and username as on the old disk. Then I copied a few important config files from the old disk (e.g. ~/.firefox/, ~/.mozilla, ~/.skype and so on, which all worked fine... except for the key ring: The old methods of just copying ~/.gconf/... and ~/.gnome2/keyrings won't work. Did I miss something? 1. Edit: I figure one needs to copy files not located in the users home directory as well. I copied the whole old /home/confus (which is my home directory) to the fresh install to no effect. That whole copy is now reverted to the fresh install's home directory, so my /home/confus is as it was the after fresh install. 2. Edit: The folder /etc/NetworkManager/system-connections seems to be the place for WiFi passwords. Could be that /usr/share/keyrings is important as well for ssh keys - that's the only sensible thing that a search came up with: find /usr/ -name "*keyring* 3. Edit: Still no ssh and ftp passwords from the keyring. What I did: Convert old hard drive to usb drive Put new drive in the laptop and installed fresh version of 12.10 there (same uid, username and passwort) Booted from old hdd via USB and copied its /etc/NetwrokManager/system-connections, ~/.gconf/ and ~/.gnome2/keyrings, ~/.ssh over to the new disk. Confirmed that all keys on the old install work Booted from new disk Result: No passphrase for ssh keys, no ftp passwords in keyring. At least the WiFi passwords are migrated. 4. Edit: Boutny! Ending soon... 5. Edit: Keyring's now in ./local/share/keyrings/. Also interesting .gnupg

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  • How to list user installed applications (not packages)?

    - by Bucic
    Not packages and not all applications. Just the applications user installed by himself from whatever source (Software Center, manually added PPA, etc.). If the above is not possible - a list of all installed applications or at least a GUI which lists the applications so I can take screenshots of it. I've read a dozen of similar questions and people posting answers usually don't even get close to OP question merit. Please note that my question includes 'user installed'. Answer: It is not currently possible in Ubuntu Linux. (choosing tijybba's answer as the closest one though)

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  • Book: Pro SQL Server 2008 Service Broker: Klaus Aschenbrenner

    - by Greg Low
    I've met Klaus a number of times now and attended a few of his sessions at conferences. Klaus is doing a great job of evangelising Service Broker. I wish the SQL Server team would give it as much love. Service Broker is a wonderful technology, let down by poor resourcing. Microsoft did an excellent job of building the plumbing for this product in SQL Server 2005 but then provided no management tools and no prescriptive guidance. Everyone then seemed surprized that the takeup of it was slow. I even...(read more)

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  • rsync not working between NTFS/FAT and EXT

    - by wim
    I have music that I play in my car, from an FAT32 USB stick. The folder which I use to put songs on is stored on my EXT4 hard drive. I add/remove/retag songs regularly and occassionally want to rsync the changes to the USB stick. But for some unknown reason (maybe permissions?), rsync copies all the files every time rather than just changed ones. I am calling rsync like : rsync -vrlptgD source dest How can I make it work like I want it to (i.e. know when a file hasn't been changed and don't copy it)?

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  • Upcoming Database Design Pre-Cons

    - by drsql
    In July and October, I will be doing my "How To Design a Relational Database" full day conference in two places. First on July 26 for the East Iowa SQL Saturday , and then for the big daddy SQLPASS Summit in Charlotte, NC on October 14. You can see the entire abstract here on the SQL PASS site. It is essentially the same concept as last year, but this year I am making a few big changes to really give the people what they have desired (and am truly glad to have a swing at it several months...(read more)

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  • Which hidden files and directories do I need?

    - by Sammy Black
    In a previous question, I explained my situation/plan: backing up home directory on external drive, reformatting laptop drive, installing 14.04, putting home directory back. (It hasn't happened yet because I can't seem to find the down time, in case things aren't working right away.) It occurred to me that maybe I don't want all of those hidden files and directories (e.g. .local/share/ubuntuone/syncdaemon/, .cache/google-chrome/, etc.) Just judging by the amount of time in copying, I can tell that some of these hidden directories are large. Question: Are there any hidden directories that I obviously don't need/want when I have the laptop running an updated distribution? Will they cause conflicts? (I plan on copying the backed-up directory tree back onto the laptop with the --no-clobber option.)

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  • Will you be at the PASS Summit?

    - by KKline
    Don't forget about the cool services from SQL Sentry for Summiteers, like the free area shuttle and the printed area maps ! Details are in a 5-part series by our CEO, Greg Gonzalez, at http://greg.blogs.sqlsentry.net/ . Are you coming to Charlotte next week for the PASS Summit ? Let's connect! When ever it's open, I'll be in the Exhibit Hall at the SQL Sentry booth unless I'm delivering a session or something of that nature. Here's the sessions I've got on the calendar - Tue, Oct 15: First-timers...(read more)

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  • "Reverse" encryption? - EncFS the other way around?

    - by stwissel
    Currently I'm using EncFS to encrypt my directory "confidential" to ".encconfidential" and sync that encrypted directory using an online service (e.g. Dropbox, UbuntuOne etc). However my entire disk is already LUKS encrypted, so the double encryption takes a toll on performance. I wonder is there an "inverted" EncFS option? An unencrypted directory gets mounted and in the mounted directory you only see encrypted files. So I could work with the unencrypted documents while the sync tool sees and read/writes the encrypted files only.

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  • Book Review: Expert Cube Development with Microsoft SQL Server 2008 Analysis Services

    - by Greg Low
    I spent last week on campus in Redmond with the SQL Server Analysis Services Maestro program. It was great to have a chance to focus on SSAS for a week. As part of that, I did quite a bit of reading as I had quite a bit of travelling time. Ironically, I re-read a few books. The first was Marco Russo, Alberto Ferrari and Chris Webb's book Expert Cube Development with Microsoft SQL Server 2008 Analysis Services . I've often told BI classes that I've been teaching that this is a really good book and...(read more)

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  • Will you share your SQL Server configuration?

    - by Bill Graziano
    I regularly visit client sites and review their SQL Server configurations.  I come across all kinds of strange settings.  I’ve been thinking about a way to aggregate people’s configurations and see what’s common and what’s unique.  I used to do that with polls on SQLTeam.com.  I think we can find out more interesting things if we look at combinations of settings in relation to size and volume. I’ve been working on an application for another project that is similar.  It will be fairly easy to use that code for this.  I can have something up and running in a few days – if people are interested in it.  I admit that I often come up with ideas that just don’t make sense.  This may be one of them.  One of your biggest concerns has be how secure your data is.  My solution is not to store anything identifying.  The instance name and database names can both be “anonymized” and I don’t store the machine name or IP address or anything to do with logins. Some of the questions I’m curious about are: At what size database does the Enterprise Edition become prevalent? Given the total size of the databases how much RAM is common? How many people have multiple data files?  At what size does that become prevalent? How common is database mirroring?  Replication?  Log shipping? How common is full recovery mode?  At what data size does it become prevalent? I think those are all questions that are easy to answer -- with the right data.  The big question is whether or not people will share their SQL Server configurations.  I understand that organizations in regulated or high security environments can’t participate.  But I think that leaves many, many people that can.  Are you willing to share your configuration and learn about others?  I have a simple sign up form here.  It’s actually a mailing list signup that also captures your edition, number of servers and largest database.  The list will only be used for this project.  Is your SQL Server is configured correctly?  Do you wonder what the next step is as your data grows?  Take a second and sign up.

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  • Why can't tuxboot and ubuntu play well together?

    - by mmr
    I'm trying to get clonezilla to run off of a usb stick, and it seems that the right way to do that is via tuxboot. Tuxboot is not compilable on ubuntu. I used git to get it from the repository, and then when I run the 'install' script (because building it is apparently not allowed, since the build script just tries to install windows things). Qmake-linux wants my qmake executable to be in the same directory as the stuff I pulled down, and let's just say that if there's a way to do this easily, I ain't seein' it. So then I download the linux file, the most recent of which is tuxboot-linux-25. Try to run it, get a failure that libpng12.so.0 isn't found. OK, then I go to install that via the instructions I found on the web but firefox seems to have already deleted from my history (yay!) Then I add the /usr/local/lib directory to ldconfig via emacs (had to install that too, of course): http://ubuntuforums.org/showthread.php?t=369848 I still get the errors that libpng12.so.0 cannot be opened because 'No such file or directory'. ldconfig -p | grep libpng shows that the library is there, but it still doesn't seem to be findable. What to do next? (for the record, doing this in windows is painless-- download, click, and it's done. But I'm trying to be all linuxy and get away from Windows for this...)

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  • WMP Skipping Chapters When Restored to Fullscreen

    - by Jonathan Sampson
    I just noticed a rather interesting issue with WMP. I'm watching a DVD while working, and noticed that if I minimize it to my taskbar, and open up the small preview window I can watch it just fine. But if I restore it while it's playing, it immediately skips ahead to the next chapter, blowing right past several minutes of content. Is this standard behavior? Is there a work-around to keep it from doing this?

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  • Automatically sync a folder to a USB when USB is plugged in?

    - by John
    Is there a way to sync a folder to an USB drive when the drive is plugged in? I'd like it to sync, or copy over changes, both ways. I've seen the Back In Time and Unison-GTK applications, but I'd like for it to run as soon as the drive is mounted. What I mean is, unintrusively sync the two folders without any input from myself besides setting it up. If this isn't possible, is it possible to run the application when the thumb drive is plugged in to remind myself to sync manually? Thanks!

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  • SQL Saturday 194 - Exeter

    - by Dave Ballantyne
    Many kudos goes to Jonathan and Annette Allen and the others on the team for confirming SQL Saturday 194 in Exeter on the 8th and 9th of March.  The event home page is here http://www.sqlsaturday.com/194/eventhome.aspx and I delighted that myself and Dave Morrison will be presenting a full day pre-con on the 8th on favourite subjects “TSQL and Internals”. Here is the full abstract : TSQL and internals - When faced with performance issues there are many lines of attack. Tuning the engine itself can get you so far, however for maximum effect you need to understand how the engine and how it translates SQL statements into performable actions. This is not a simple task, it is a massive task to deal with a multi-table join and the number of permutations can be immense. To back up this knowledge, we can create better performing TSQL and understand the impact that is has upon the engine and recognize the pitfalls and gotcha’s that exist in SQLServer. Ultimately, there is no ‘best way’ to perform a single task only many variations of ‘it depends’ , but now we can pick the most appropriate option for the required dataload. Over the years, there have been many myths and misconceptions have grown around the product, some have basis in older versions and some are just wrong. Continuing to build on the knowledge given so far these issue will be explored and broken down and proved or disproved. Finally we will look to the future and explore SQL Server 2012 and the new functionality that that brings and some of the common uses that we will be able to address. After completion of this days pre-con, attendees will have a more complete knowledge of execution plans, and how they relate to the physical and logical actions that SQLServer will be executing on their behalf. The attendees will also have a more rounded and fuller knowledge of TSQL and the implications of incorrectly defining a query. Dave is a fountain of knowledge on execution plans and optimizer internals and ,though i may flatter myself, I’m no shrinking violet when it comes to TSQL and such matters.  I hope that if you cant join us, then there are other pre-cons available from other experts in their fields that may ‘float you boat’ too.  The pre-con page is http://sqlsouthwest.co.uk/SQLSaturday_precon.htm Also, excitingly, this pre-con day is sponsored by Fusion-IO which is a great boon for the day. If you want a more of this then i am offering a 2 day TSQL course starting on the 19th of March. More details on this are available here

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  • Introduction to the SQL Server Analysis Services Neural Network Data Mining Algorithm

    In data mining and machine learning circles, the neural network is one of the most difficult algorithms to explain. Fortunately, SQL Server Analysis Services allows for a simple implementation of the algorithm for data analytics. Dallas Snider explains 24% of devs don’t use database source control – make sure you aren’t one of themVersion control is standard for application code, but databases haven’t caught up. So what steps can you take to put your SQL databases under version control? Why should you start doing it? Read more to find out…

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  • Intercepting the Unity logout

    - by qbi
    I want to copy some data from another machine to a local computer on a regular basis. At the moment I'm researching different solutions and try to find the one which fits best. Basically I want to open a network connection (or use an existing one), make a VPN connection and start a rsync process. This should be done on every logout of my desktop session or on shutdown. One possible solution might be to somehow intercept the Unity shutdown and execute a script. So is there a possibility to execute a script on GNOME/Unity shutdown? I'm aware that you can do it on system shutdown. How can I do this?

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  • SQL Database Management Survey

    Win one of two $50 Amazon vouchers by entering our database management survey. We’re finding out more about how SQL database professionals are doing backup and recovery, using cloud services and more. Answer the short survey for a chance to win. Learn Agile Database Development Best PracticesAgile database development experts Sebastian Meine and Dennis Lloyd are running day-long classes designed to complement Red Gate’s SQL in the City US tour. Classes will be held in San Francisco, Chicago, Boston and Seattle. Register Now.

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