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• How to recover broken MJPEG AVI file after a camera crash

  - by Jam K

  I was recording a video when my KODAK EASYSHARE M531 Digital Camera fell to the ground and turned off. When i turned it on nothing happened to the camera but the video file is somehow broken. Obviously the camera did not have time to convert and close it properly. $file myvid.avi myvid.AVI: data where it should be: another_vid.AVI: RIFF (little-endian) data, AVI, 640 x 480, ~30 fps, video: Motion JPEG, audio: uLaw (stereo, 12000 Hz)` I would like to fix my video which I believe needs to be converted to AVI. Any idea? VLC does not play the file and returns: could not determine type of stream

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• How to mirror filesystems with millions of hardlinks?

  - by Thomas Berger

  We have one big problem at the moment: We need to mirror a filesystem for one of our customers. Thats usual not really a problem, but here it is: On this filesystem there is one folder with millions of hardlinks (yes! MILLIONS!). rsync requires more then 4 days to just build the filelist. We use the following rsync options: rsync -Havz --progress serverA:/data/cms /data/ Has anyone a idea how to speed up this rsync, or use alternatives? We could not use dd as the target disk is smaller then the source.

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• RAID5 on SmartArray P410i online resize

  - by datacompboy

  I have P410i+256M Cache without battery backup. My RAID5 was build over 3*136GB disks, now all disks were replaced to a 3*300GB array. How can I extend it to use the whole space? HPacucli doesn't allows that, I think this might be because no battery is present. I have a redundant power supply. All data is mirrored over DRBD to a secondary server, so I can try to resize with a chance of loss of data in case of power failure, but I prefer to have an online resize.

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• How can I convert audio files to this format?

  - by jeffamaphone

  I have a bunch of audio files that are named .wav but it seems not all .wavs are created equal. For example: $ file * file1.wav: RIFF (little-endian) data, WAVE audio, Microsoft PCM, 16 bit, stereo 44100 Hz file2.wav: Audio file with ID3 version 2.2.0, contains: MPEG ADTS, layer III, v1, 160 kbps, 44.1 kHz, JntStereo file3.wav: Claris clip art? file4.wav: Audio file with ID3 version 2.2.0, contains: MPEG ADTS, layer III, v1, 160 kbps, 44.1 kHz, JntStereo And for good measure, a non-wav: file5.m4a: ISO Media, MPEG v4 system, iTunes AAC-LC I would like to convert all of these files to the format that file1.wav is: RIFF (little-endian) data, WAVE audio, Microsoft PCM, 16 bit, stereo 44100 Hz What is the proper set of arguments to pass to afconvert to make that happen?

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• Western Digital not recognized by Windows after power Outage on windows

  - by vikasde

  I have WD Essential Plus 1.5TB (formatted in NTFS). It was working fine under windows and mac mini. While it was connected to the mac mini, I had an power outage and now the HD is not being recognized under windows anymore. Now on the mac mini the HD is fine and I can see my data. When I use ActiveBootDisk under windows, then I can see the data as well. I updated the drivers on windows machine and also updated the firmware on the HD, but its still not being recognized. Is there any way for me to fix the HD under windows without having to re-format it?

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• EBS+RAID10+XFS slower than EBS+RAID10+EXT3 using MySQL?

  - by Johann Tagle

  We're currently using EC2 with 16 EBS volumes in RAID10 configuration for our MySQL data. I know some people don't recommend to put EBS volumes to RAID but that's not what I'm concerned about at the moment. Current format is ext3, but we're experimenting with moving to xfs, given many reports that it is faster. However, we're actually experiencing a performance degradation when the partition was converted to xfs - a benchmark run with inserts, updates, selects and deletes was more than 10 seconds slower using xfs. Any idea what could be the problem? Below is the fstab entry (really only changed ext3 to xfs). Database tables are innodb and we are using innodb_file_per_table. /dev/mapper/vg_data-lv_data /data xfs noatime 0 0 Thanks.

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• Windows 8.1 upgrade created a second recovery partition. Can I remove the original?

  - by Dave S

  Windows 8.1 upgrade created a second recovery partition. Can I remove the original? Prior to this the partitions were Recovery, EFI, OS(C:), Data(D:). After the upgrade partitions are Recovery, EFI, OS(C:), Recovery, Data(D:). The first Recovery partition is 1023MB the second is 350MB The "Create a system image" tool selects the EFI, OS(C:), and the second 350MB Recovery partitions. The first 1023MB Recovery partition is not listed, I have to "assume" it is now redundant. The factory (HP) Recovery Partition was removed using the HP provided tool after creating recovery disks, and the D: partition created months ago.

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• Is it possible to re-lock a bitlocker drive?

  - by Sean Edwards

  I'm running a partition with bitlocker on a Windows 7 Ultimate machine, which contains secure data that I have to recover infrequently. Unlocking it to access the data is obviously no problem, but is there a way to re-lock the partition when I'm done? The best I've found so far is this: http://social.technet.microsoft.com/Forums/en-US/w7itprosecurity/thread/41607938-7452-440d-8253-67fe8657bc0f Currently I have a .bat script on that drive that I can run as administrator, and that re-locks the drive, but it feels like kind of a hackish solution. Does anyone have anything better? Any idea when Microsoft might release a fix for this?

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• Multiple PXE server same subnet

  - by Termiux

  I've been struggling with this for some time. I have a few test machines that boot from the network, they receive the boot data from the DHCP server, this tells them who is the boot server where is the file they'll boot etc. However, I need to add a second PXE server in the same subnet (create another Vlan is not an option right now). I read somewhere that I may be able to send certain parameters to certain machines based on their MAC address (this way choosing what computers boot from what server) however I cannot find how to do this, anyone knows how? this will be my solution but I cannot find the answer. My DHCP is a windows server 2003 I have 2 servers running custom flavors of Linux server as TFTP servers. Some machines use data to boot from server 1, and the others must bu able to boot from server 2. Thx

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• Erase all traces of Windows 8

  - by user1032531

  Just bought a new HP pavilion desktop with Windows 8. I wish to totally remove Windows 8 and all data on the hard drive, remove any windows partitions, delete all data, and then install a fresh Linux. Problem is I can seem to get to boot from USB or boot from CD. It appears that Windows 8 added the following two "features": UEFI which substitutes what we have known as the BIOS Secure Boot which prevents anything but the installed operating system How do I completely and totally erase all traces of Windows 8? Is it still possible to reformat the hard drive? I don't want a duel boot, I don't want to go back to Windows 7, I just want anything Windows gone.

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• Is opening ports in the firewall bad?

  - by Steven

  From what little I know about networking, opening ports lets external data get sent in. But how that data is handled is entirely up to the applications running on my machine. So if I'm not running any malicious applications, there should be nothing wrong with disabling the firewall, right? Also, how do applications work when ports aren't forwarded? For example, I need to forward port TCP 6112 to host Blizzard games, but I've heard that HTTP uses port 80, but I haven't forwarded that port, yet Firefox still works. Btw I'm using Windows Vista.

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• MSSQL Backup Question

  - by MJ

  I'm currently taking over for someone who was in charge of backing up over 250 servers on different platforms, until we hire a replacement. The main question I have is: If we use a backup software, such as Symantec backup exec, does this perform the correct backup for MSSQL Server? I was listening to Stack Overflow Podcast, and I heard them talk about you cannot just backup the SQL data files, but you also need the transaction log? So, if we just backup the whole machine, would we be able to recover it correctly, since we would be backing up the data file and the log? Thanks!

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• Further Performance Tuning on Medium SharePoint Farm?

  - by elorg

  I figured I would post this here, since it may be related more to the server configuration than the SharePoint configuration or a combination of both? I'm open for ideas to try, or even feedback on things that maybe have been configured incorrectly as far as performance is concerned. We have a medium MOSS 2007 install prepped and ready for receiving the WSS 2003 data to upgrade. The environment was originally architected by a previous coworker, and I have since added a few configuration modifications to assist with performance before we finally performed the install. When testing the new site collections & SharePoint install (no actual data yet), things seemed a bit slow. I had assumed that it was because I was accessing it remotely. Apparently the client is still experiencing this and it is unacceptably slow. 1 SQL Server running SQL Server 2008 2x SharePoint WFEs - hosting queries (no index) 1x SharePoint Index - hosting index (no queries) MOSS 2007 installed and patched up through December '09 on WFEs & Index All 4 servers are VMs, should have more than sufficient disk space & RAM (don't recall at the moment), and are running Windows Server 2008 - everything is 64-bit. The WFEs have Windows NLB configured, with a DNS name & IP for the NLB cluster. Single NIC on each server (virtual, since VMWare). The Index server is configured as a WFE (outside of the NLB cluster) so that it can index itself and replicate the indexes to the WFEs that will serve the queries. Everything is configured & working properly - it just takes a minute or two to load a page on the local LAN. The client is still using their old portal (we haven't started the migration/upgrade just yet) so there's virtually no data or users. We need to either further tune the configuration, or fix anything that may have been configured incorrectly which is causing this slowness? I've already reviewed & taken into account everything that I could find that was relevant before we even started the install. Does anyone have ideas or pointers? Perhaps there's something that I've missed?

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• How safe is locking the screen?

  - by D Connors

  So, both windows and linux have a pretty useful feature that allows you to leave everything running on the PC while also keeping invaders away by locking the screen. My question is: Say I leave my laptop with the screen locked while I go get a donnut, and then it gets stolen. Assuming the thief has access to whatever software he needs, how easy/hard would it be for him to access my (currently logged-in) account? Now let me be clear. I'm not asking if he can access the data on the harddrive. I know he can, and that issue would go under data encryption, which is not my question here. I'm focusing on how hard would it be to get around the "Insert Password" screen, and have full access to my account. I'm looking for answers regarding both OS's; but, if needed, assume Ubuntu. Thank you.

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• What are the challenges when my enterprise desires to move the processing component of an applicatio

  - by Berkay

  Assume that i have an enterprise accounting application that consists of a front-end interface, a processing tier, and a back-end database. This is an application that contains private business data, and thus is traditionally run in a secure private network environment within the enterprise. What are the challenges that appear when my enterprise desires to move the processing component of this application to a cloud computing data center in order to achieve greater scalability or to reduce IT costs ? Pls note: do i have to make significant changes to my own infrastructure to enable external access to formerly private resources? do i have to modify the application code to handle new network topology ? thanks, if you give your answers in a simple manner, really appreciated.

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• Recommended boot partition size for Windows 7

  - by dwj

  I started using One Big Partition for everything and separating data out with folders when I got my current computer years ago. I'm preparing to upgrade my system from Windows XP to Windows 7 and I thought I might go back to putting my data on a separate partition. Most likely I'll just use the default OS install. My current Program Files tree has ~16 GB of stuff. Thinking ahead though, I've had XP installed for years. Who knows what apps I'm going to install down the line? This, of course, begs the question: How big do I make my Windows 7 install partition?

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• Can I use Apache 2.0 ErrorDocument and Mod Alias to store error pages outside the DocumentRoot?

  - by Pete

  I'd like to store my nicely designed set of http error documents outside the DocumentRoot. Alias /errors /data/opt/apache-httpd-2.0.63/htdocs/errorpages/ <Directory "/data/opt/apache-httpd-2.0.63/htdocs/errorpages/"> order deny,allow allow from all </Directory> ErrorDocument 500 /errors/500.html ErrorDocument 404 /errors/404.html ErrorDocument 401 /errors/default.html ErrorDocument 403 /errors/default.html ErrorDocument 502 /errors/default.html ErrorDocument 503 /errors/default.html However, when I do this, all I get is "The requested URL /errors/default.html resulted in an error." Is it possible to use mod_alias and the ErrorDocument directive together like this in Apache 2.0?

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• Database checksum features - redundant? useful?

  - by Eloff

  Just about every mainstream DB has a feature to calculate checksums per page, per sector, or per record. Now for a DB that does full recover after any crash, like PostgreSQL, is a checksum even useful? There will be no data loss as long as the xlog is ok, no matter what kind of corruption happened to the data itself, as the redo log is replayed every committed transaction will be restored. So checksums are useless on restore. Doesn't the filesystem or disk keep checksums anyway to detect corruption? So unless the checksum is per record, all it does is tell you there is corruption - which the OS should be yelling at you the minute you try to read it - so useless in operation? I can't imagine how a checksum can be helpful in any sane database - but since they all use them - I'd say that's just failure of imagination on my part. So how is it useful?

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• Avoid read-write access to bad sectors on HDD to continue working on the HDD

  - by goldenmean

  I have a HP Pavilion dv6446 notebook. It had Windows Vista Home premium. After 4.5+ years of usage, just recently it started malfunctioning. While working fine, its screen goes white or sometimes some thin black lines horizontally. Laptop freezes. Hard reboot works. Again it works for some 2 hrs or so, same error. To diagnose I did run the Memory and Hard disk check which is present in the Bios Setup. Memory test passed. Hard disk test returned an error saying something like - "Replace the hard disk". Bad.. Some sectors or platters have gone bad on the disk. (I confirmed this later by further tests mentioned below) Then I tried installing a Ubuntu 11.10. It listed 3 partitions /dev/sda1, sda2, sda2. It again gave error and could not install grub loader on /dev/sda1. Bad sectors. Then redid the Ubuntu installation, this time asked to to install the Ubuntu on /dev/sda3. and kept /dev/sda1 for /home. Installed fine, and works fine as well. Due to unavailability of WiFi/ Ethernet driver for that adapters under Ubuntu( at least I could not configure them and get the networking working at all), I decided to go back to reinstall windows Vista. It did install fine. I did not have to format one data partition which has my data. I just formatted one partition which installed Windows So in effect HDD has not undergone a full format here. Worked ok for 1 day. But same white screen and freeze happened. Looks like while it is in use, it accesses the bad sectors for storing some data and that's when it bombs. I am inclined to think HDD has not failed fully or crashed but has developed bad sectors. Else if it was a HDD crash, it would have refused to boot at all let alone install on it. Questions: Is there any HDD test check under windows or any such tools windows/linux based ewhere which can identify the bad sectors of the HDD and 'lock/isolate' them from further read-write access of any kind. If not what are my options, if any to salvage this laptop HDD without replacing it. EDIT: Would the Disk Error checking tool under windows help in any way?

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• collectd:Monitoring server not showing clients

  - by Quintin Par

  I have setup a monitoring server with the following setup. <Plugin network> Listen "0.0.0.0" "25826" </Plugin> Now my clients are sending data to the monitoring server(verified through tcpdump). Even the collection folder shows that the data is being dumped /var/lib/collectd/rrd [ec2-user at x rrd]$ ll total 4 drwxr-xr-x 11 root root 4096 Nov 20 17:53 x-web-1.y.com [ec2-user at x rrd]$ I have also verified with find . -mmin 1 to see if its being constantly updated. [ec2-user@x rrd]$ find . -mmin 1 ./x-web-1.y.com/interface-eth0/if_errors.rrd ./x-web-1.y.com/interface-eth0/if_packets.rrd ./x-web-1.y.com/interface-eth0/if_octets.rrd ./x-web-1.y.com/disk-xvda1/disk_time.rrd ./x-web-1.y.com/disk-xvda1/disk_ops.rrd ./x-web-1.y.com/disk-xvda1/disk_octets.rrd ./x-web-1.y.com/disk-xvda1/disk_merged.rrd But when i look it up through collectd-web, I don't see the clients What might be wrong in my setup?

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• RAID - software vs. hardware

  - by Robert MacLean

  I have always used hardware based raid because it (IMHO) it's on the right level (feel free to dispute this) and that OS failures are more common to me than hardware issues. Thus if the OS fails the raid is gone and so is the data, where on a hardware level regardless of OS the data remains. However on a recent Stack Overflow podcast they stated they would not used hardware raid as the software raid is better developed and thus runs better. So my question is, is there any reasons to choose one over the other?

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• How could I let Skydrive desktop sync to MicroSD in Windows 8 tablet?

  - by peSHIr

  I have a Samsung Slate 7 tablet with (now) Windows 8 on it. This machine has a 64 Gb SSD and I have a 64 Gb MicroSD card in it. I also have a Skydrive on my main Microsoft ID that contains about 45 Gb of content. With Windows and some development stuff installed, my Skydrive will not fit on the main drive of the tablet. (Besides, my idea was to keep data on the memory card anyway, to make it easier to repave the machine without data loss if need be.) My problem should now be clear: I want to install the Skydrive desktop app to sync my Skydrive to the MicroSD card. This is not possible, as Skydrive does not allow syncing files to removable drives. I have tried a number of things already, but none of them worked: Use the mklink command line tool to create a directory link/junction from a folder name on SSD to a folder on the MicroSD and then try to install Skydrive sync to the SSD link folder. Skydrive however still recognizes this as something it does not want to sync onto. The various different filter drivers mentioned on Agnipulse (including the Hitachi one) that should make windows see some or all of the removable drives in the system as fixed drives do not seem work on (64-bit) Windows 8: they either can't be installed, do nothing and/or cause Windows 8 to go into Automatic Repair mode when rebooting. The Lexar BootIt app seems to be meant to flip the relevant bit in the on-board drive controller of supported USB pen drives, but I tried it anyway. Of course it did nothing to how the MicroSD card was seen. I have now run out of ideas, it seems, and I was wondering if anyone here has a solution to let Windows 8 see the MicroSD memory card in my tablet as a fixed drive instead of removable drive, or some other way of getting the Skydrive desktop to sync my Skydrive data to that MicroSD card. And to be complete: this is not a duplicate question of this or this as those ask about getting USB drives multiple partitions to work on Windows XP. This question is specific about getting desktop Skydrive to sync to MicroSD card in Windows 8, which seems to be a question I have not seen on superuser so far.

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• How to install Win7 over top of WinXP partition?

  - by Zeno

  I have a 2TB hard drive with 2 partitions on it, one a C drive for WinXP and another for extra space. I have a Win7 Pro install DVD and I have formatted that C drive via the DVD; it is now a blank "Primary" partition. I attempted to go through the Win7 setup and install it on that partition, but it's giving me an error: Setup unable to create new system partition or locate existing system partition. See setup log files for more info Googling around leads me to believe the entire drive has to be "cleaned" (diskpart) but that would wipe the entire other non-OS partition and I need to keep that data. How can I install Win7 on this blank partition without losing data on the other partition?

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• Could not open the dk file

  - by IgnacioRivera

  I dont know what I have done, but it is over a month now that I can not open my virtual machine, I'm using a MacBookPro with Fusion 2.0.6. I recently upgraded my system to Snow Leopard. but it was working fine. Now I get a message that says" File not found: Windox XP. vmdk. I went to all my backups and when I unpack the files in the virtual machine, there is not such a file. the only file that I can see that may contents the data is the .vmem file that show to have 1.2 GB of data. I have tryed and tryed to contact VMware support but it has become an impossible task, If theres someone that could give me some ideas on how to recover my virtual machine????

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• Need to setup a VoIp for 45 user

  - by Sania

  A T1 Line will be suficient to support Voice and Data for 45 user.

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