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• Is there a simple context-menu add-in that could make-up for the Windows-7 status bar deficiency?

  - by DanO

  Edit: I initially asked about free disk space and selected item size. It has since been pointed out that the selected item size summary is still availiable natively in the details pane. I had read elsewhere (wikipedia) that this was removed along with disk free space, which is not the case. Only free disk space has been completely removed. Selection size is still availiable. Is there a context menu add-in out there that could show the free disk space of the relevant drive, when you right click? This would go a long way to compensating for one of the only steps backward I’ve discovered in Windows 7 so far. I doubt anyone had created one specifially for this need before windows 7 because this information was previously easily accessible in the status bar. I thought about creating one, but it has been a while since I have messed with the Shell API, and I know there are coders out there who could do it faster and better. If you’ve heard of one, or know of something else to make-up for this Microsoft misstep, I’d appreciate hearing about it. If MS were listing to the community they would already have a powertoy or add-in of some kind to un-break this. (they could release it unsupported even), as there seem to be many power users that are extremely annoyed by this feature removal decision. If anyone has seen something, please post it here. As it has been only 4 days since official Windows 7 release, I'll wait at least a week to chose an answer. Here's a picture of protoype screenshot: SU question 19232 is related.

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• SQL SERVER – Retrieve and Explore Database Backup without Restoring Database – Idera virtual databas

  - by pinaldave

  I recently downloaded Idera’s SQL virtual database, and tested it. There are a few things about this tool which caught my attention. My Scenario It is quite common in real life that sometimes observing or retrieving older data is necessary; however, it had changed as time passed by. The full database backup was 40 GB in size, and, to restore it on our production server, it usually takes around 16 to 22 minutes, depending on the load server that is usually present. This range in time varies from one server to another as per the configuration of the computer. Some other issues we used to have are the following: When we try to restore a large 40-GB database, we needed at least that much space on our production server. Once in a while, we even had to make changes in the restored database, and use the said changed and restored database for our purpose, making it more time-consuming. My Solution I have heard a lot about the Idera’s SQL virtual database tool.. Well, right after we started to test this tool, we found out that it really delivers what it promises. Using this software was very easy and we were able to restore our database from backup in less than 2 minutes, sparing us from the usual longer time of 16–22 minutes. The needful was finished in a total of 10 minutes. Another interesting observation is that there is no need to have an additional space for restoring the database. For complete database restoration, the single additional MB on the drive is not required anymore. We can use the database in the same way as our regular database, and there is no need for any additional configuration and setup. Let us look at the most relevant points of this product based on my initial experience: Quick restoration of the database backup No additional space required for database restoration virtual database has no physical .MDF or .LDF The database which is restored is, in fact, the backup file converted in the virtual database. DDL and DML queries can be executed against this virtually restored database. Regular backup operation can be implemented against virtual database, creating a physical .bak file that can be used for future use. There was no observed degradation in performance on the original database as well the restored virtual database. Additional T-SQL queries can be let off on the virtual database. Well, this summarizes my quick review. And, as I was saying, I am very impressed with the product and I plan to explore it more. There are many features that I have noticed in this tool, which I think can be very useful if properly understood. I had taken a few screenshots using my demo database afterwards. Let us see what other things this tool can do besides the mentioned activities. I am surprised with its performance so I want to know how exactly this feature works, specifically in the matter of why it does not create any additional files and yet, it still allows update on the virtually restored database. I guess I will have to send an e-mail to the developers of Idera and try to figure this out from them. I think this tool is very useful, and it delivers a high level of performance way more than what I expected. Soon, I will write a review for additional uses of SQL virtual database.. If you are using SQL virtual database in your production environment, I am eager to learn more about it and your experience while using it. The ‘Virtual’ Part of virtual database When I set out to test this software, I thought virtual database had something to do with Hyper-V or visualization. In fact, the virtual database is a kind of database which shows up in your SQL Server Management Studio without actually restoring or even creating it. This tool creates a database in SSMS from the backup of the same database. The backup, however, works virtually the same way as original database. Potential Usage of virtual database: As soon as I described this tool to my teammate, I think his very first reaction was, “hey, if we have this then there is no need for log shipping.” I find his comment very interesting as log shipping is something where logs are moved to another server. In fact, there are no updates on the database from log; I would rather compare it with Snapshot Replication. In fact, whatever we use, snapshot replicated database can be similarly used and configured with virtual database. I totally believe that we can use it for reporting purpose. In fact, after this database was configured, I think the uses of this tool are unlimited. I will have to spend some more time studying it and will get back to you. Click on images to see larger images. virtual database Console Harddrive Space before virtual database Setup Attach Full Backup Screen Backup on Harddrive Attach Full Backup Screen with Settings virtual database Setup – less than 60 sec virtual database Setup – Online Harddrive Space after virtual database Setup Point in Time Recovery Option – Timeline View virtual database Summary No Performance Difference between Regular DB vs Virtual DB Please note that all SQL Server MVP gets free license of this software. Reference: Pinal Dave (http://blog.SQLAuthority.com), Idera (virtual database) Filed under: Database, Pinal Dave, SQL, SQL Add-On, SQL Authority, SQL Backup and Restore, SQL Data Storage, SQL Query, SQL Server, SQL Tips and Tricks, SQL Utility, SQLAuthority News, T SQL, Technology Tagged: Idera

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• InnoDB Compression Improvements in MySQL 5.6

  - by Inaam Rana

  MySQL 5.6 comes with significant improvements for the compression support inside InnoDB. The enhancements that we'll talk about in this piece are also a good example of community contributions. The work on these was conceived, implemented and contributed by the engineers at Facebook. Before we plunge into the details let us familiarize ourselves with some of the key concepts surrounding InnoDB compression. In InnoDB compressed pages are fixed size. Supported sizes are 1, 2, 4, 8 and 16K. The compressed page size is specified at table creation time. InnoDB uses zlib for compression. InnoDB buffer pool will attempt to cache compressed pages like normal pages. However, whenever a page is actively used by a transaction, we'll always have the uncompressed version of the page as well i.e.: we can have a page in the buffer pool in compressed only form or in a state where we have both the compressed page and uncompressed version but we'll never have a page in uncompressed only form. On-disk we'll always only have the compressed page. When both compressed and uncompressed images are present in the buffer pool they are always kept in sync i.e.: changes are applied to both atomically. Recompression happens when changes are made to the compressed data. In order to minimize recompressions InnoDB maintains a modification log within a compressed page. This is the extra space available in the page after compression and it is used to log modifications to the compressed data thus avoiding recompressions. DELETE (and ROLLBACK of DELETE) and purge can be performed without recompressing the page. This is because the delete-mark bit and the system fields DB_TRX_ID and DB_ROLL_PTR are stored in uncompressed format on the compressed page. A record can be purged by shuffling entries in the compressed page directory. This can also be useful for updates of indexed columns, because UPDATE of a key is mapped to INSERT+DELETE+purge. A compression failure happens when we attempt to recompress a page and it does not fit in the fixed size. In such case, we first try to reorganize the page and attempt to recompress and if that fails as well then we split the page into two and recompress both pages. Now lets talk about the three major improvements that we made in MySQL 5.6.Logging of Compressed Page Images:InnoDB used to log entire compressed data on the page to the redo logs when recompression happens. This was an extra safety measure to guard against the rare case where an attempt is made to do recovery using a different zlib version from the one that was used before the crash. Because recovery is a page level operation in InnoDB we have to be sure that all recompress attempts must succeed without causing a btree page split. However, writing entire compressed data images to the redo log files not only makes the operation heavy duty but can also adversely affect flushing activity. This happens because redo space is used in a circular fashion and when we generate much more than normal redo we fill up the space much more quickly and in order to reuse the redo space we have to flush the corresponding dirty pages from the buffer pool.Starting with MySQL 5.6 a new global configuration parameter innodb_log_compressed_pages. The default value is true which is same as the current behavior. If you are sure that you are not going to attempt to recover from a crash using a different version of zlib then you should set this parameter to false. This is a dynamic parameter.Compression Level:You can now set the compression level that zlib should choose to compress the data. The global parameter is innodb_compression_level - the default value is 6 (the zlib default) and allowed values are 1 to 9. Again the parameter is dynamic i.e.: you can change it on the fly.Dynamic Padding to Reduce Compression Failures:Compression failures are expensive in terms of CPU. We go through the hoops of recompress, failure, reorganize, recompress, failure and finally page split. At the same time, how often we encounter compression failure depends largely on the compressibility of the data. In MySQL 5.6, courtesy of Facebook engineers, we have an adaptive algorithm based on per-index statistics that we gather about compression operations. The idea is that if a certain index/table is experiencing too many compression failures then we should try to pack the 16K uncompressed version of the page less densely i.e.: we let some space in the 16K page go unused in an attempt that the recompression won't end up in a failure. In other words, we dynamically keep adding 'pad' to the 16K page till we get compression failures within an agreeable range. It works the other way as well, that is we'll keep removing the pad if failure rate is fairly low. To tune the padding effort two configuration variables are exposed. innodb_compression_failure_threshold_pct: default 5, range 0 - 100,dynamic, implies the percentage of compress ops to fail before we start using to padding. Value 0 has a special meaning of disabling the padding. innodb_compression_pad_pct_max: default 50, range 0 - 75, dynamic, the  maximum percentage of uncompressed data page that can be reserved as pad.

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• Draw Bug 2D player Camera

  - by RedShft

  I have just implemented a 2D player camera for my game, everything works properly except the player on the screen jitters when it moves between tiles. What I mean by jitter, is that if the player is moving the camera updates the tileset to be drawn and if the player steps to the right, the camera snaps that way. The movement is not smooth. I'm guessing this is occurring because of how I implemented the function to calculate the current viewable area or how my draw function works. I'm not entirely sure how to fix this. This camera system was entirely of my own creation and a first attempt at that, so it's very possible this is not a great way of doing things. My camera class, pulls information from the current tileset and calculates the viewable area. Right now I am targettng a resolution of 800 by 600. So I try to fit the appropriate amount of tiles for that resolution. My camera class, after calculating the current viewable tileset relative to the players location, returns a slice of the original tileset to be drawn. This tileset slice is updated every frame according to the players position. This slice is then passed to the map class, which draws the tile on screen. //Map Draw Function //This draw function currently matches the GID of the tile to it's location on the //PNG file of the tileset and then draws this portion on the screen void Draw(SDL_Surface* background, int[] _tileSet) { enforce( tilesetImage != null, "Tileset is null!"); enforce( background != null, "BackGround is null!"); int i = 0; int j = 0; SDL_Rect DestR, SrcR; SrcR.x = 0; SrcR.y = 0; SrcR.h = 32; SrcR.w = 32; foreach(tile; _tileSet) { //This code is matching the current tiles ID to the tileset image SrcR.x = cast(short)(tileWidth * (tile >= 11 ? (tile - ((tile / 10) * 10) - 1) : tile - 1)); SrcR.y = cast(short)(tileHeight * (tile > 10 ? (tile / 10) : 0)); //Applying the tile to the surface SDL_BlitSurface( tilesetImage, &SrcR, background, &DestR ); //this keeps track of what column/row we are on i++; if ( i == mapWidth ) { i = 0; j++; } DestR.x = cast(short)(i * tileWidth); DestR.y = cast(short)(j * tileHeight); } } //Camera Class class Camera { private: //A rectangle representing the view area SDL_Rect viewArea; //In number of tiles int viewAreaWidth; int viewAreaHeight; //This is the x and y coordinate of the camera in MAP SPACE IN PIXELS vect2 cameraCoordinates; //The player location in map space IN PIXELS vect2 playerLocation; //This is the players location in screen space; vect2 playerScreenLoc; int playerTileCol; int playerTileRow; int cameraTileCol; int cameraTileRow; //The map is stored in a single array with the tile ids //this corresponds to the index of the starting and ending tile int cameraStartTile, cameraEndTile; //This is a slice of the current tile set int[] tileSetCopy; int mapWidth; int mapHeight; int tileWidth; int tileHeight; public: this() { this.viewAreaWidth = 25; this.viewAreaHeight = 19; this.cameraCoordinates = vect2(0, 0); this.playerLocation = vect2(0, 0); this.viewArea = SDL_Rect (0, 0, 0, 0); this.tileWidth = 32; this.tileHeight = 32; } void Init(vect2 playerPosition, ref int[] tileSet, int mapWidth, int mapHeight ) { playerLocation = playerPosition; this.mapWidth = mapWidth; this.mapHeight = mapHeight; CalculateCurrentCameraPosition( tileSet, playerPosition ); //writeln( "Tile Set Copy: ", tileSetCopy ); //writeln( "Orginal Tile Set: ", tileSet ); } void CalculateCurrentCameraPosition( ref int[] tileSet, vect2 playerPosition ) { playerLocation = playerPosition; playerTileCol = cast(int)((playerLocation.x / tileWidth) + 1); playerTileRow = cast(int)((playerLocation.y / tileHeight) + 1); //writeln( "Player Tile (Column, Row): ","(", playerTileCol, ", ", playerTileRow, ")"); cameraTileCol = playerTileCol - (viewAreaWidth / 2); cameraTileRow = playerTileRow - (viewAreaHeight / 2); CameraMapBoundsCheck(); //writeln( "Camera Tile Start (Column, Row): ","(", cameraTileCol, ", ", cameraTileRow, ")"); cameraStartTile = ( (cameraTileRow - 1) * mapWidth ) + cameraTileCol - 1; //writeln( "Camera Start Tile: ", cameraStartTile ); cameraEndTile = cameraStartTile + ( viewAreaWidth * viewAreaHeight ) * 2; //writeln( "Camera End Tile: ", cameraEndTile ); tileSetCopy = tileSet[cameraStartTile..cameraEndTile]; } vect2 CalculatePlayerScreenLocation() { cameraCoordinates.x = cast(float)(cameraTileCol * tileWidth); cameraCoordinates.y = cast(float)(cameraTileRow * tileHeight); playerScreenLoc = playerLocation - cameraCoordinates + vect2(32, 32);; //writeln( "Camera Coordinates: ", cameraCoordinates ); //writeln( "Player Location (Map Space): ", playerLocation ); //writeln( "Player Location (Screen Space): ", playerScreenLoc ); return playerScreenLoc; } void CameraMapBoundsCheck() { if( cameraTileCol < 1 ) cameraTileCol = 1; if( cameraTileRow < 1 ) cameraTileRow = 1; if( cameraTileCol + 24 > mapWidth ) cameraTileCol = mapWidth - 24; if( cameraTileRow + 19 > mapHeight ) cameraTileRow = mapHeight - 19; } ref int[] GetTileSet() { return tileSetCopy; } int GetViewWidth() { return viewAreaWidth; } }

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• System Variables, Stored Procedures or Functions for Meta Data

  - by BuckWoody

  Whenever you want to know something about SQL Server’s configuration, whether that’s the Instance itself or a database, you have a few options. If you want to know “dynamic” data, such as how much memory or CPU is consumed or what a particular query is doing, you should be using the Dynamic Management Views (DMVs) that you can read about here: http://msdn.microsoft.com/en-us/library/ms188754.aspx  But if you’re looking for how much memory is installed on the server, the version of the Instance, the drive letters of the backups and so on, you have other choices. The first of these are system variables. You access these with a SELECT statement, and they are useful when you need a discrete value for use, say in another query or to put into a table. You can read more about those here: http://msdn.microsoft.com/en-us/library/ms173823.aspx You also have a few stored procedures you can use. These often bring back a lot more data, pre-formatted for the screen. You access these with the EXECUTE syntax. It is a bit more difficult to take the data they return and get a single value or place the results in another table, but it is possible. You can read more about those here: http://msdn.microsoft.com/en-us/library/ms187961.aspx Yet another option is to use a system function, which you access with a SELECT statement, which also brings back a discrete value that you can use in a test or to place in another table. You can read about those here: http://msdn.microsoft.com/en-us/library/ms187812.aspx  By the way, many of these constructs simply query from tables in the master or msdb databases for the Instance or the system tables in a user database. You can get much of the information there as well, and there are even system views in each database to show you the meta-data dealing with structure – more on that here: http://msdn.microsoft.com/en-us/library/ms186778.aspx  Some of these choices are the only way to get at a certain piece of data. But others overlap – you can use one or the other, they both come back with the same data. So, like many Microsoft products, you have multiple ways to do the same thing. And that’s OK – just research what each is used for and how it’s intended to be used, and you’ll be able to select (pun intended) the right choice. Share this post: email it! | bookmark it! | digg it! | reddit! | kick it! | live it!

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• Multiple render targets and pixel shader outputs terminology

  - by Rei Miyasaka

  I'm a little confused on the jargon: does Multiple Render Targets (MRT) refer to outputting from a pixel shader to multiple elements in a struct? That is, when one says "MRT is to write to multiple textures", are multiple elements interleaved in a single output texture, or do you specify multiple discrete output textures? By the way, from what I understand, at least for DX9, all the elements of this struct need to be of the same size. Does this restriction still apply to DX11?

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• Breaking down CS courses for freshmen

  - by Avinash

  I'm a student putting together a slide geared towards freshmen level students who are trying to understand what the importance of various classes in the CS curriculum are. Would it be safe to say that this list is fairly accurate? Data structures: how to store stuff in programs Discrete math: how to think logically Bits & bytes: how to ‘speak’ the machine’s language Advanced data structures: how to store stuff in more ways Algorithms: how to compute things efficiently Operating systems: how to do manage different processes/threads Thanks!

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• Should certain math classes be required for a Computer Science degree?

  - by sunpech

  For a Computer Science degree at many colleges and universities, certain math courses are required: Calculus, Linear Algebra, and Discrete Mathematics are few examples. However, since I've started working in the real world as a software developer, I have yet to truly use the knowledge I had at once acquired from taking those classes. My question is: Should these math classes be required to obtain a computer science degree? Or would they better served as electives? A Slashdot post: CS Profs Debate Role of Math In CS Education

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• Are proofs worth the effort?

  - by Shashank Jain

  I bought the de-facto book for learning about data structures and algorithms (CLRS). The book is though quite good but the singularity is in the proofs. The book is filled with Lemmas, theorems, peculiar symbols and unimaginable recurrence relations which are very hard to understand. I am able to somehow get the algorithms but the discrete mathematics just not for me. So should I leave them out and just concentrate on algorithims?

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• Mutable Records in F#

  - by MarkPearl

  I’m loving my expert F# book – today I thought I would give a post on using mutable records as covered in Chapter 4 of Expert F#. So as they explain the simplest mutable data structures in F# are mutable records. The whole concept of things by default being immutable is a new one for me from my C# background. Anyhow… lets look at some C# code first. using System; using System.Collections.Generic; using System.Linq; using System.Text; namespace MutableRecords { public class DiscreteEventCounter { public int Total { get; set; } public int Positive { get; set; } public string Name { get; private set; } public DiscreteEventCounter(string name) { Name = name; } } class Program { private static void recordEvent(DiscreteEventCounter s, bool isPositive) { s.Total += 1; if (isPositive) s.Positive += 1; } private static void reportStatus (DiscreteEventCounter s) { Console.WriteLine("We have {0} {1} out of {2}", s.Positive, s.Name, s.Total); } static void Main(string[] args) { var longCounter = new DiscreteEventCounter("My Discrete Counter"); recordEvent(longCounter, true); recordEvent(longCounter, true); reportStatus(longCounter); Console.ReadLine(); } } } Quite simple, we have a class that has a few values. We instantiate an instance of the class and perform increments etc on the instance. Now lets look at an equivalent F# sample. namespace EncapsulationNS module Module1 = open System type DiscreteEventCounter = { mutable Total : int mutable Positive : int Name : string } let recordEvent (s: DiscreteEventCounter) isPositive = s.Total <- s.Total+1 if isPositive then s.Positive <- s.Positive+1 let reportStatus (s: DiscreteEventCounter) = printfn "We have %d %s out of %d" s.Positive s.Name s.Total let newCounter nm = { Total = 0; Positive = 0; Name = nm } // // Using it... // let longCounter = newCounter "My Discrete Counter" recordEvent longCounter (true) recordEvent longCounter (true) reportStatus longCounter System.Console.ReadLine() Notice in the type declaration of the DiscreteEventCounter we had to explicitly declare that the total and positive value holders were mutable. And that’s it – a very simple example of mutable types.

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• Ubuntu 12.04 + AMD Radeon driver 12.8 problem

  - by wpinacz

  I have a Lenovo G570 laptop with AMD Radeon 6370M GPU. I wanted to install new 12.8 driver from AMD but with no success, after install and reboot, I got a screen with reconfigure graphics driver and it won't work. If I install 12.6 driver it works but I cannot switch to my integrated Intel GPU, only discrete (AMD) GPU is working. Please help with my problem (installing 12.8 driver or switching GPU under 12.6 driver).

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• Where to after a year of java? [closed]

  - by avatarX

  I've just finished a my first year of programming Java at varsity and I have a three month break. In terms of my development would it be better to: Cover Java in more depth to acquire a more intermediate level of ability Learn a new programming language (if so which) to a similar level as my current Java ability Spend timing learning introductory discrete maths, algorithms and data structures I'm also open to any other possibilities that would be beneficial but that could be covered in about 3 months.

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• Live cd and usb install failure blank screen when trying to install on an HP Pavilion dv6

  - by Ajian

  I recently bought a new computer, and have been trying to install linux on it, 11.10 x64. It is a HP pavilion dv6-6117dx. 2.4GHz/1.5GHz VISION A8 Technology from AMD with AMD Quad-Core A8-3500M Accelerated Processor AMD Radeon HD 6620G Discrete-Class Graphics I am pretty sure i picked a unsupported graphics card or something. I have tried booting from usb as well, but the screen becomes blank after rebooting.

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• How to securely generate memorable passwords?

  - by Tim

  Whenever I need new passwords I use some tools to generate those, preferable memorable passwords, but I've been wondering how secure this might actually be. Using The xkcd random number generator is probably pretty bad, cat /dev/random is probably pretty good, but generating memorable passwords seems a bit more tricky. Whenever a program generates a memorable password, it only uses a subset of the total password space available, and it is not clear to me how big this space is. Of course a long password should help in this case, but if the `memorable' part of the program is too predictable, your passwords are not very good in the end. TL;DR: how secure are memorable password generators, given the fact that `memorable' passwords are a subset of total password space? Some tools I know of: pwgen -- seems ok, but passwords are not too memorable Mac Password Assistant - generates memorable passwords but it is unclear to me how this works.

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• KVM online disk resize?

  - by Eil

  We're evaluting KVM for Linux virtualization on a few projects. All is going well so far. But one of our requirements is the ability to add disk space to a running guest without rebooting or taking it offline. Is this possible with KVM? The only thing I've found so far (but have not tested yet) is the ability to hotplug disks into the machine. If I go this route, then I could always add the new disk to an LVM volume group on the guest and then extend the chosen logical volume. The biggest downside to this approach is that over time we might end up with guests having variable numbers of virtual disks. The "real" disk space would be provided to the host over a SAN, so we can always add more space to the host whenever.

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• How do I convert a Linux disk image into a sparse file?

  - by endolith

  I have a bunch of disk images, made with ddrescue, on an EXT partition, and I want to reduce their size without losing data, while still being mountable. How can I fill the empty space in the image's filesystem with zeros, and then convert the file into a sparse file so this empty space is not actually stored on disk? For example: > du -s --si --apparent-size Jimage.image 120G Jimage.image > du -s --si Jimage.image 121G Jimage.image This actually only has 50G of real data on it, though, so the second measurement should be much smaller. This supposedly will fill empty space with zeros: cat /dev/zero > zero.file rm zero.file But if sparse files are handled transparently, it might actually create a sparse file without writing anything to the virtual disk, ironically preventing me from turning the virtual disk image into a sparse file itself. :) Does it? Note: For some reason, sudo dd if=/dev/zero of=./zero.file works when cat does not on a mounted disk image.

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• SQL Server Analysis Services 2005 crash when disk is full?

  - by squillman

  One of our SQL boxes ran itself out of disk space last night. This particular server has both the database engine and analysis services on it. Database engine was not happy about having no disk space on the volume where all the data files are, but analysis services just plain died. At least, the only thing I have to blame is the full volume. Has anyone experienced a SSAS that they've been able to directly tie to no disk space? I've got nothing else in the SQL or event logs to blame...

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• Cancel table design change in SQL Server 2000

  - by Bryce Wagner

  In SQL Server Enterprise Manager and change one of the columns and save it, it will create a table with the new definition, and copy all the data to that new table, and then delete the old table when it's done. But if your table is large (let's say on the order of 100GB), it can take a long time to do this. Even worse, if you don't have sufficient disk space, it doesn't notice ahead of time, and it will spend a long time trying to copy the table, run out of space, and then decide to abort the process. We have other ways to copy the data in smaller chunks, but those require significantly more manual intervention, so it's usually easier to just let Enterprise Manager figure it out, as long as there's enough disk space. So for a long running "Design Table" save like this, is there any way to cancel once it's started? Or do you just have to wait for it to fail?

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• Flexible virtualization infrastructure Design with libvirt

  - by Lessfoe

  I'm going to install a CentOS6 Server with Virtualization ( libvirtd ) capabilities on a DELL Server with Hardware RAID5 of around 6T of disk space ( It has 4x2T disks in a PERC700 RAID Controller ). I'm going then to install some guests which requires few resources except one that needs 500GB of disk space, 8/16GB of RAM and good performances. I was thinking about file images for guests storage but I'm not sure about the 500GB VM what needs good performances so that an LVM device could be better. So my question is what would be the best layout concerning: RAID setup ( RAID5, RAID1 + 1 disk for OS only. ) disk partitioning ( using the entire disk/ leave free space for future use and extending it with LVM ) guests storage management ( LVM devices or file images ( considering the 500GB VM that is performance demanding ) or mixed ) Where to put guests storage? /var/lib/libvirt/images or maybe in a custom dir separated from system /home/VMs Thanks in advance for any hint.

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• Carbonite has taken over my iMac

  - by Larry Rothfork

  I used Carbonite to back up 75GB on my iMac. I also created a folder on my iMac to copy files to, from an external hard drive and then use Carbonite to back up from there. And THEN thinking I had everything safely backed up and, in order to make room on my hard drive I DELETED some of those files, and instead of increasing disk space..my disk space has shrunk to 2GB... I know, I know..you can't use Carbonite like that, but now I have two questions. 1) What is the explanation for the decrease in disk space even though I have deleted about 20GB of those backed up files from my hard drive? It must have something to do with the way Carbonite references backed up files, And 2) Is there a way to extricate myself from this situation?

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• Carbonite has taken over my iMac

  - by Larry Rothfork

  I used Carbonite to back up 75GB on my iMac. I also created a folder on my iMac to copy files to, from an external hard drive and then use Carbonite to back up from there. And THEN thinking I had everything safely backed up and, in order to make room on my hard drive I DELETED some of those files, and instead of increasing disk space..my disk space has shrunk to 2GB... I know, I know..you can't use Carbonite like that, but now I have two questions. 1) What is the explanation for the decrease in disk space even though I have deleted about 20GB of those backed up files from my hard drive? It must have something to do with the way Carbonite references backed up files, And 2) Is there a way to extricate myself from this situation?

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• Linux DD command partition -to- partition

  - by Ben Jackson

  I just used the DD command to copy the contents of one partition over to another partition on another drive, like this: dd if=/dev/sda2 of=/dev/sdb2 bs=4096 conv=noerror sda2 partition was 66GB and sdb2 was 250GB. I read that by doing this the extra space on the drive I am copying to will be wasted, is this true? I wasn't worried about loosing the extra space for the time being however, I just ran: sudo kill -USR1 (PID) to view the current status of DD and it has written over 66GB of data, will it continue to write data until it gets to 250GB? If so, is there a way to stop the process without corrupting it as waiting for it to write blank space seems like a waste of time.

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• Allow image upload - most efficient way?

  - by K-P

  Hey everyone, In my site, I currently only allow users to import images from other sites rather than uploading it themselves. The main reason for this is because I don't have much storage space on my host (relatively speaking). The host charges quite a bit for additional space. What are the alternatives to hosting images users upload (max 1mb size). Would it be a good idea to purchase separate cheap hosting with "unlimited space" (I know that's not true, but I'm guessing it's more than 1gb)? Or are there some caveats with this approach (e.g. security since the site should not be browsable, but accessed via another server)? Are there alternative ideas that I could employ? Thanks for any suggestions

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• Cork Board Solution to tack things up on top or to the side of a monitor

  - by Bela

  I'm trying to find some sort of physical product that would either go on the top or the side of an lcd monitor and give me space to tape/push-pin/post it note things for myself. In my head I am picturing an extra space above your monitor 6 inches tall that lets you tape/push pin things up in front of you. For random notes and things I want to keep track of, having them on the top/side of my monitor would keep the space on my desk itself clear, and they would be closer to my field of vision. Does something like this exist? Do I need to rig up something myself? EDIT This is the closest thing I can find so far http://www.unplggd.com/unplggd/diy-project/reverse-engineer-how-to-feel-up-your-monitor-048251

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• How can I move my partition in GParted?

  - by reprogrammer

  The following is a screenshot of GParted run on my system. There is a small unallocated space at the beginning of the list. This 1 MiB space is kind of annoying and I'd like to merge with any other partition except /dev/sda1, /dev/sda6 and /dev/sda4. When I right click on the unallocated partition, the only available operation is "New". And, if I click on "New", I get the following error message. It is not possible to create more than 4 primary partitions Any ideas of how to go about merging the small unallocated space with other partitions?

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