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• A space-efficient filesystem for grow-as-needed virtual disks ?

  - by Steve Schnepp

  A common practice is to use non-preallocated virtual disks. Since they only grow as needed, it makes them perfect for fast backup, overallocation and creation speed. Since file systems are usually based on physical disks they have the tendency to use the whole area available1 in order to increase the speed2 or reliability3. I'm searching a filesystem that does the exact opposite : try to touch the minimum blocks need by an aggressive block reuse. I would happily trade some performance for space usage. There is already a similar question, but it is rather general. I have very specific goal : space-efficiency. 1. Like page caching uses all the free physical memory 2. Canonical example : online defragmentation 3. Canonical example : snapshotting

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• is there a way to have VIM do incremental search on text files?

  - by Alex

  Is there a way to have VIM do incremental search on text files? Vim already does incremental search within the currently open file. Examples of programs that demonstrate the type of search I'm trying to accomplish are Notational Velocity for MacOS, Resop for windows or SimpleNote for the web. These apps do an instant or incremental search in the files of a specific directory and make it easy/fast to narrow down the file you are looking for or create a new file. I use both but would rather live in one editor.(that being VIM) Is there some plug in that would do this?

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• Internet really slow or stops working on my computer but fine on my laptop and ipad

  - by Fr0zen1

  I know you are going to say that this has been answered already, but it hasnt. None of those solutions worked for me. So this is the problem, and it only occurs on my computer, my laptop,ipad and iphone are just fine. When I`m browsing the net, it laods webpages slow(my speed is 30mb down and 3mb up) and when I start downloading with a another application(steam, utorrent), my browser completely stops working, but the application thats downloading(steam, utorrent) continues to download with a fast spead(2-3mb/s) and I do not know why. I have this issue on all browsers. I have tried chrome, internet explorer and firefox. I have restored my windows but still the same issue and I also have kubuntu installed and it also has the same issue. I do not know why. Any help? Thank you

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• When to use MySQL replication or DRBD for HA on Xen VM?

  - by user62513

  I'm setting up a database which needs to be needs to provide High Availabilty. My primary concern is high performance and robustness (I don't want something that will fail fast and badly). The database is accessed by the application at an average of 300 qps. It's will run on Xen VMs and it has some InnoDB tables as well as MyISAM tables. The VMs are connected via ethernet 100Mbit/s ethernet cables. Which of the two - MySQL replication or DRBD - would you recommend in such a situation? Or should I use DRBD to make the master database Highly Available and use MySQL replication on the slaves? I'm a developer so these things are all not so easy for me to make a sound judgement.

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• Is the iPad in Europe totally unblocked?

  - by Mike

  One fast question: if I buy an iPad 3G in Europe will it work on other places without jailbreak? I ask this because I heard that, in Europe, iPads are not blocked to any telecom but I am not sure about that. On the other hand I am afraid do buy because I know that their cousins, iphones, are blocked to a specific telecom. Another question is regarding activation. As far as I remembered, my iPhone required me to do an activation step on iTunes and I remember it was also activated (or whatever) on the store (I remembered the salesman connected it to a computer and did some stuff before giving me the device). Is the iPad in europe totally free of operator? totally unblocked? thanks.

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• How to set/keep directory permissions?

  - by Dylan

  I'm using CwRsync to connect from my Windows development machine to a linux webserver : rsync -avuz -e ./ssh --exclude=".svn" /cygdrive/c/xampp/htdocs/project123/ [email protected]:/home/user123/public_html This syncs my development project directory nicely and fast to the server. But after doing this, all directory properties are reset to the local user user123 only, so the website is not available anymore. I need to manually reset those properties. Why is this happening, and how to prevent it? PS. coming from a Windows environment I'm having a really hard time understanding rsync. I copied the above command from some examples... just need to get this one small thing working too...

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• ZFS on top of iSCSI

  - by Solipsism

  I'm planning on building out a file server using ZFS and BSD, and I was hoping to make it more expandable by attaching drives stored in other machines in the same rack via iSCSI (e.g., one machine is running ZFS, and others have iSCSI targets available to be connected to by the ZFS box and added to zpools). Looking for other people who have tried this has pretty much lead me to resources about exposing iSCSI shares on top of ZFS, but nothing about the reverse. Primarily I have the following questions: Is iSCSI over gigabit ethernet fast enough for this purpose, or would I have to switch to 10GbE to get decent performance? What would happen when one of the machines running iSCSI targets disconnects from the network? Is there a better way to do this that I just am not clever enough to have realized? Thanks for any help.

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• Windows and domain suffix addition

  - by grawity

  I have a DNS domain and host it on my own server. My desktop PC (Windows XP) is configured to have mydomain.tld as its primary DNS suffix. Now, when the system tries to resolve any domain - stackoverflow.com, for example - it tries with the suffix added first, even if the name has periods in it. In other words, it tries stackoverflow.com.mydomain.tld. before stackoverflow.com.. Is this valid according to DNS standards and common sense? Is there anything I can do to prevent it, other than removing the prefix completely? (I still want it to be appended to single-component hostnames. Currently I have two prefixes . and mydomain.tld. configured, but it isn't very fast when resolving foohost.)

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• Add users in Windows machine without AD

  - by guillem

  I have several development machines where I am the administrator. We are using AD in my organization but is maintained by and offshore IT group any request takes a long time. We are currently granting access to developers on development machines manually so it's a bit annoying to maintain although at least it's fast. We have also a lot of external consultants that need to use those machines for some time. Is there any tool or method to maintain a set of users synced on those machines without the need add them to an AD group?

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• PHPMyAdmin running very slow over internet but fine locally

  - by columbo

  I connect to PHPMyAdmin remotely on a Centos server using my local PC via Firefox. Usually it's fine but today it's really slow (2 minutes to load a page), sometimes timing out. Other connections to the server are fine. The SSH command line is as fast as ever as is the GNOME dekstop over SSH. In fact on the GNOME desktop I can run PHPMyAdmin locally from its browser and it's as quick as ever (which is a solution to the problem of course). I've checked the various log files and seen nothing unusual, I've logged into the MySQL command line and the database is running fine without any slowing what so ever. So it just seems to be slow when I access PHPMyAdmin on the server from the browser on my remote PC (I've tried IE and Firefox, both are slow). Has anyone experienced this or have any ideas what the issue could be. Connecting via CLI through tunnel works OK - problem is in phpMyAdmin for sure. Cheers

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• Moving files with batch files from one pc to a server, to a another pc - worried about disk corruption

  - by AnchientAnt

  I use scheduled tasks that calls a batch file, that calls more batch files to move about three files from a pc, to a server, then to multiple other pcs. It all happens very quickly, as they are small files. Are there any pitfalls for how fast these transfers happen? I'm just mildly concerned about causing some disk corruption somehow. I use logic like 1. Call MapToPc if files exist then move file to folder on server. Disconnect 2. Call SendtoPCs If files exist (the files just moved to the server) then MapToPCs Move all files Disconnect All of this happens in about 2 secs or less. edit: this on windows 7, server 2003, xp respectively

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• Why are my DNS Lookups so long (300+ms) when accessing my web site?

  - by Travis

  I'm running a Fedora 11 server with Apache 2. I'm trying to optimize so things are as fast as possible from the server side, and I'm noticing (via Firebug for Firefox) that upon loading the homepage of one of the sites on the web server that for every file it loads (HTML, CSS, JavaScript, GIF, PNG, JPG, etc.), it does a DNS lookup. All of the files it is looking up are local to the server, so I'm surprised to see it even do a DNS lookup. Also, each of these lookups is in the 150-450ms range, which is way too high for my liking. I've tried adjusting /etc/resolve.conf to use Google's Public DNS servers. I restarted the network service and tapped the page again, but the numbers didn't go down. I've reverted back to the default DNS servers since I didn't see any gain. Any ideas on what is causing it to: a) do the dns lookup in the first place, and b) take so long when doing the actual lookup? Thanks in advance.

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• Data transfer is extrem slow after partitioning extern usb drive

  - by user125912

  I bought an extern usb 3.0 drive with 500 gb capacity. OS is Windows 7. I use it with an usb 2.0 slot, no prob. Initially I used it without making several partitions and it was fast as hell. Then I had the great idea to make partitions, one for programs, one for data and one for backup. I chose the free EASEUS Partition Master 9.1.1. and ended up with these partitions: F:Apps, primary, NTFS, 100gb H:Data, logic, NTFS, 250gb B:Backup, logic, NTFS, 150gb THE PROBLEM: When I copy files from C: to F: I get a transfer rate of about 100 KB/S ! When I copy files from C: to H: I get a transfer rate of about 4 MB/S ! thats all muuuch to slow, slower then before. What can I do to speed the shit up? Thanks in advance!

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• Windows 7 extremely long startup

  - by Tyler

  Windows 7 before it even gets to login. On the "starting windows" splash screen takes no less than 15 minutes to finish more like 25 minutes most times. During this time the hard drive activity led indicator is blinking maybe once every 20 seconds. When I finally get to the desktop everything runs normally. I have unplugged all peripherals with same result. Ideas? It's 32bit. 4gig memory. Fast CPU which I can't recall off the top of my head.

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• Hooking up many different external HDs simultaneously

  - by cbizz

  I need a large amount of external storage for an upcoming project. I'm planning on purchasing 10 2TB external drives. I need them all hooked up to a single machine at the same time. What issues will I run into? I plan on using 2 power strips and having them all externally powered from the wall. I will use a USB hub to plug in all the drives. I need drive access time to be as fast as possible. I am using Ubuntu Linux(64 bit). Will I be able to mount 10 drives?

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• XDMCP is slow any ideas? (looking for alternative remote desktops)

  - by peteri

  I've been used to using RDP on Windows to remote to machines, and I've got an asus eee 701 which I want to use to do some *nix programming on. While the eee is a lovely little machine the screen and keyboard are a little small to use for lots of programming. I've tried using Xming (the free version) to remote login into the eee from my desktop using XDMCP (or even using a ssh session as a straight X11 server and no desktop on the eee) the whole thing seems seriously slow over wifi the initial desktop takes at least 5 seconds to paint (might even be 10 seconds I haven't actually timed it). So my real question is what do other folks use for remote control with a GUI for their *nix boxes? I am finding it hard to believe the performance is so bad over a wifi network (It makes the Mac IIs I used to use a college in 1988 seem fast) or is this just a problem with Xming and using say the Cygwin X11 server would be better.

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• Windows 8 switch user is very slow

  - by Chris Weber

  I recently upgraded to Windows 8 from Windows 7. One major annoyance is how slow the "switch user" command is. In Windows 7 switching users was fairly fast. I've got an SSD drive with pretty good hardware, so I'm suspecting it's something with Windows 8, either a defect, or the fact that I upgraded from Windows 7 instead of doing a clean install. Anybody have this problem? My wife is complaining enough about Windows 8 and this is one of the biggest complaints.

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• Time of splitting and encoding video with ffmpeg increases exponentially

  - by Rnd_d

  I'm trying to split video by subtitles and encode into .mp4(h.264/aac) using ffmpeg, but it takes so much time! First pieces of video are splited and encoded really fast, but for each iteration time increases, and so 40 min video takes all night or more. Small 3 min video takes max 10 mins. cmd for splitting and encoding: ffmpeg -i filename.avi -ss 00:00:0(time of sub start) -t 0:0:3(time of sub duration) -acodec libfaac -vcodec libx264 -bf 0 -f mp4 filename.mp4 ffmpeg version N-34849-g07c7ffc (last, i think) How I can make it faster? Are there, maybe, some magic arguments for ffmpeg or some hacks?

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• Unexpected behaviour in a Lotus Notes programmable table

  - by Mark B

  I'm designing a workflow database in Lotus Notes 6.0.3 (soon upgrading to 8.5), and my OS is Windows XP. I have recently tried converting a tabbed table into a programmable one. This was so that I could control which tab was displayed to the user when it was opened, so that they were presented with the most appropriate one for that document's progress through the workflow. That part of it works! One of the tabs features a radio button that controls visibility of the next tab, and a pair of cascading dialogue boxes. One contains the static list "Person":"Team", and the other has a formula based on the first: view:=@If(PeerReview = "Team"; "GroupNames"; "GroupMembers"); @Unique(@DbColumn(""; ""; view; 1)) The dialogue boxes have the property "Refresh fields on keyword change" selected. The behaviour that I wasn't expecting is this. If the radio button is set to "Yes" and a value is selected in one of the dialogue boxes, the table opens the next tab. If the radio button is set to "No" and a value is selected in one of the dialogue boxes, the entire table is hidden. I can duplicate the latter by switching off the "Refresh fields on keyword change" property on the dialogue boxes and instead pressing F9 after selecting a value. I have no idea why the former occurs, though. The table is called "RFCInfo", and I have a field on the form called "$RFCInfo" which is editable, hidden from all users who aren't me and initially set by a Postopen script, which I can post if necessary - it's essentially a Select Case statement that looks at a particular item value and returns the name of the table row relating to that value. Can anyone offer any pointers?

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• Applications starts very slowly from a network path

  - by Snowfox

  Hi We have a windows 2008 server which hosts the network share \\srvcompany\lib. This share contains several applications needed for the daily business. Every client/user (all win xp) has shortcuts on the desktop to these apps. We have the problem that at several (but not all) clients the apps starts very slowly. If I copy the application's programm files to a local folder then they'll start fastly. When I watch the memory usage in the task manager on such a "slow" machine while an applications starts I notice that the memory usage grows much slowier than when I start the app from a "fast" machine. But when I copy files with Windows Explorer from this share, the speed is nearly the same. I've also checked the network driver, both tested clients have the same network card with the same driver version. Has anyone an idea where or what I should check next to solve this problem? Thanks for answers.

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• I try to access a NFS mount via FTP. It works but the FTP Dir listing is very slow

  - by W0bble

  I mount an NFS using this command: mount -o rsize=8192,wsize=8192,timeo=14,intr serverip:/directory /mnt/directory However the mount appears on the client as expected a cmd like "ls -a" work pretty fast on the nfs mount. But when I try to list the mounted directory via FTP it gets very very slow ( 1.250 bytes in 160,39s (0,01KB/s) ). But surprisingly downloading files via FTP from nfs work with normal speeds. I tested several values for rsize and wsize parameter with no success. Both client and server are running Debian squeeze and NFSv4

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• Conditional formatting Excel 2007/2010: Highlight the first cell in the row that contains duplicate values?

  - by Nancy Prades

  I have a table with hundreds of columns and rows of data; each row and column have a header. For instance, column headers are ITEM, FILE1, FILE2, FILE3, etc. and row headers are AA, BB, CC, DD, and so on. Under conditional formatting, I used "Highlight Cells Rules" "Equal to", in order to highlight cells that have values equal to the value in another cell. In this case, my formula rule is: Rule: Cell Value = $A$1 Applies to: =$B$3:$G$8 When I input "X" into cell A1, Excel will highlight all of the cells that have a value equal to "X", in this case, the following cells are highlighted: B3, C5, G6, and E8. Here's my problem. The data that I am working with contains more than 100 columns and rows. I want to identify all of the ITEMS (AA, BB, CC, etc.) that contain the duplicate file "X". In order to do this I have to scroll right to left, and up and down. Here's my question. Is there a way to use conditional formatting to add an additional rule? I want to keep the current rule, but I also want the row header to be highlighted if any of the cells in that row contain a value equal to "x". In this case, I want AA, CC, DD, and FF to also be highlighted. Is this possible? I've spent days trying to figure this out - and no luck. Any help would be appreciated! :) Nancy A B C D E F G 1 X 2 ITEM FILE1 FILE2 FILE3 FILE4 FILE5 FILE 6 3 AA x t y u d w 4 BB r y a b k d 5 CC y x f u i g 6 DD t v b d f x 7 EE e w y s l n 8 FF w u n x e m

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• Whats the best way to deal with backups for my php/mysql application

  - by spirytus

  I'm creating php application for my client and now thinking what would be the best way to do backups, automatically if possible? I don't have much experience in this area and in case something goes wrong, or if I need to migrate, I would like to have fast way of getting it all back online. I understand "something goes wrong" is a very wide term, but lets say that someone hacks my site and wipes out database and all the files. My app. is written in php/mysql and I got access to cpanel (hosted with justhost.com if that makes any difference :). I used Joomla and it has JoomlaPack that does complete backup almost automatically and in case site fails, its easy to revert, or migrate if necessary. Is there anything like that for my configuration that would make reverting/migration, easy?

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• Trying to reinvent the wheel of StackOverflow to have a good learning experience. Need some suggesti

  - by Legend

  I want to learn and am not able to do it unless I have a real "mission" to complete. SO is my favorite and I can't imagine a better experience than actually recreating it but not in ASP. I'd like to use PHP+MySQL+jQuery. So far, I have been a self-taught programmer but I would like to master one paradigm that forces you to adhere to the standards. For instance, recently, jQuery forced me to use some "rules". The plugins were supposed to be written in a particular way and that's it. When I started off, everything seemed like Greek and Latin but when I finished a very small plugin, I felt really happy because it forced me to program in a certain way. I am looking for something like this only in a larger project. I've heard a lot about MVC and all but I am confused about the various frameworks out there. Zend seems awesome but looks heavy at the same time and also requires you to have a lot more control over the web-server whereas CakePHP is a good and a fast framework that needs only little control. Do I use one of these or just write my own MVC? I have the following goals: Goals: Site should be fast - I know this depends on my coding skills but I will learn on my way. The framework itself should not slow me down) Setting up the site should not require you to use command-line - This requirement is ok during development. But some frameworks like Symphony require you to initialize certain things through command-line Should support pluggable modules - For instance, if I want to be able to use the FCK editor, I should be able to organize things in a good way. Should be possible to extend - For instance, SO is mainly a Q&A site but I should be able to logically extend it into an Idea Management System (optional but I'm curious). This goes more into code re-usability I guess. I am comfortable with MySQL so I should be done with database design etc. with some serious effort. As for PHP, I can write code on my own but haven't really used any frameworks that much. jQuery, I started off recently and love it. I would be glad if someone can guide me during these initial steps. Precisely, when designing something like SO, I have the following questions: Do I use a framework? If yes, should it be MVC? If MVC, which one is a good and a scalable one? (I'd love something like jQuery that will not die anytime soon) How do I balance the functionality? The same logic can sometimes be made server centric or client centric. (more Ajax?). Is it a good idea to make a heavy javascript site considering the recent advances on client-side JS processing? Just in case anyone is wondering, I am not interested in commercializing any of this. I need a reason to learn something :)

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• Windows 7 System Image Restore to SSD - SSD not detected?

  - by steviey

  I recently bought a new SSD (OCZ Vertex 2 120GB) as a replacement for my laptop HDD . I created a System Image on an external drive using the Win 7 backup and restore tool and then restored this image to the SSD using the Win 7 disk. AHCI is enabled in Win 7 and the BIOS, but it seems that windows is not detecting the disk as an SSD because, in the defragger, the disk is still available for defragging. Prefetch and Superfetch were also still enabled. I have manually disabled scheduled defragging, prefetch and superfetch. I have also checked that TRIM is enabled using: fsutil behavior query DisableDeleteNotify and the result is '0' (it is). Performance seems ok, but not quite as fast as I expected. Was restoring from a win7 generated system image a mistake? Am I getting optimal SSD performance?

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