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• Software Raid 10 corrupted superblock after dual disk failure, how do I recover it?

  - by Shoshomiga

  I have a software raid 10 with 6 x 2tb hard drives (raid 1 for /boot), ubuntu 10.04 is the os. I had a raid controller failure that put 2 drives out of sync, crashed the system and initially the os didnt boot up and went into initramfs instead, saying that drives were busy but I eventually managed to bring the raid up by stopping and assembling the drives. The os booted up and said that there were filesystem errors, I chose to ignore because it would remount the fs in read-only mode if there was a problem. Everything seemed to be working fine and the 2 drives started to rebuild, I was sure that it was a sata controller failure because I had dma errors in my log files. The os crashed soon after that with ext errors. Now its not bringing up the raid, it says that there is no superblock on /dev/sda2, even if I assemble manually with all the device names. I also did a memtest and changed the motherboard in addition to everything else. EDIT: This is my partition layout Disk /dev/sdb: 2000.4 GB, 2000398934016 bytes 255 heads, 63 sectors/track, 243201 cylinders, total 3907029168 sectors Units = sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 4096 bytes I/O size (minimum/optimal): 4096 bytes / 4096 bytes Disk identifier: 0x0009c34a Device Boot Start End Blocks Id System /dev/sdb1 * 2048 511999 254976 83 Linux /dev/sdb2 512000 3904980991 1952234496 83 Linux /dev/sdb3 3904980992 3907028991 1024000 82 Linux swap / Solaris All 6 disks have the same layout, partition #1 is for raid 1 /boot, partition #2 is for raid 10 far plan, partition #3 is swap, but sda did not have swap enabled EDIT2: This is the output of mdadm --detail /dev/md1 Layout : near=1, far=2 Chunk Size : 64k UUID : a0feff55:2018f8ff:e368bf24:bd0fce41 Events : 0.3112126 Number Major Minor RaidDevice State 0 8 34 0 spare rebuilding /dev/sdc2 1 0 0 1 removed 2 8 18 2 active sync /dev/sdb2 3 8 50 3 active sync /dev/sdd2 4 0 0 4 removed 5 8 82 5 active sync /dev/sdf2 6 8 66 - spare /dev/sde2 EDIT3: I ran ddrescue and it has copied everything from sda except a single 4096 byte sector that I suspect is the raid superblock EDIT4: Here is some more info too long to fit here lshw: http://pastebin.com/2eKrh7nF mdadm --detail /dev/sd[abcdef]1 (raid1): http://pastebin.com/cgMQWerS mdadm --detail /dev/sd[abcdef]2 (raid10): http://pastebin.com/V5dtcGPF dumpe2fs of /dev/sda2 (from the ddrescue cloned drive): http://pastebin.com/sp0GYcJG I tried to recreate md1 based on this info with the command mdadm --create /dev/md1 -v --assume-clean --level=10 --raid-devices=6 --chunk=64K --layout=f2 /dev/sda2 missing /dev/sdc2 /dev/sdd2 missing /dev/sdf2 But I can't mount it, I also tried to recreate it based on my initial mdadm --detail /dev/md1 but it still doesn't mount It also warns me that /dev/sda2 is an ext2fs file system but I guess its because of ddrescue

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• Preventing VPN connections for clients that have no active virusscanner

  - by Aron Rotteveel

  Is there a way to prevent VPN connections based on certain security related criteria, such as presence of a virusscanner and virus definitions? In our case, we have a Windows Server 2008 acting as a domain controller and RRAS server. We also have ESET NOD32 Business running on every client, with the installs being pushed by the server.

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• How to encrypt dual boot windows 7 and xp (bitlocker, truecrypt combo?) on sdd (recommended?)

  - by therobyouknow

  I would like to setup a dual boot Windows 7 and Windows XP laptop/notebook computer where each operation system's partition is fully encrypted. I would like to do this on a SSD - a 128Gb Crucial M4. My research Dual boot of truecrypt encrypted OSs on one drive (not possible - in Truecript 7.x at time of writing) This cannot be done on a standard Truecrypt setup - it will only support encrypting one of the operating systems. I have tried this and also read about it here on superuser.com However, I did see a solution here that uses grub4dos as the initial bootloader to chain to separate truecrypt encrypted OSs, in my case Windows 7 and Windows XP: http://yyzyyz.blogspot.co.uk/2010/06/truecrypt-how-to-encrypt-multiple.html I am not going to consider this solution as it relies upon some custom code for use in the bootloader that is provided by the author. I would prefer a solution that can be fully understood so that I can be sure that there is nothing undesirable occuring (i.e. malware or just simply bugs in the code). I would like to believe such a solution doesn't have those risks but I can't be sure. BitLocker and Truecrypt combination - possible solution? So I am now considering a combination of encryption programs: I now aim to encrypt Windows XP with Truecrypt and Windows 7 with BitLocker. Assuming Truecrypt bootloader can boot into non-Truecrypt OSs (e.g. via hitting Escape to go to another menu), then this solution may be viable. SSDs and Encryption (use fastest possible spinning hard disk instead (?)) I read on various superuser.com posts and elsewhere that current SSDs are not suited to whole drive encryption for various reasons: impact of performance algorithms that give SSDs advantage over spinning harddisks. Algorithms used in compression of data for example. Wear on the SSD, shortening its life Security issues whereby data is repeated, as indicated in some Truecrypt documentation So I am now considering not using SSD. But with the aim to have the fastest drive possible, I am considering using the Western Digital Scorpion black 2.5" 7200rpm harddisk as this appears to be top rated among spinning platter-based harddrives (don't work for Western Digital). Summary So to achieve whole drive encrypted dual boot Windows 7 and Windows XP with minimal performance impact I intend to use a combination of Truecrypt and Bitlocker on a top-rated conventional spinning platter-based harddisk. Questions Will my summary: achieve whole disk encryption of the dual-boot Windows XP, Windows 7? OR an you suggest a simpler solution, including one that only requires only Truecrypt (BitLocker not available on XP). Or another encryption tool, including paid-for? provide the highest performance. Am I correct to avoid using SDD with encryption for the reasons I discovered? Are the concerns about SSDs and encryption still very real (some articles I read go back to 2010) Thanks for your input!

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• Command-line video concatenation and recompression?

  - by Alex R

  What is the best CLI tool (preferably Linux based) that will allow concatenating video files, and also compressing them on the client-side for YouTube upload? Thanks

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• Use-cases for assigning multiple IP addresses to 1 NIC

  - by Harry

  What would be some of major use-cases in which you would want to assign multiple IP addresses to your NIC? Knowing of any standard/well-known 'gotchas' associated with each use-case would also be helpful. For example, I heard someone saying that a user with access to such a machine will automatically get access to both networks, which could be a security issue. You can assume a Linux-based environment.

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• DS3400 - Getting exact operation progress

  - by romant

  Ended up adding a disk to a DS3400 array. Unfortunately it's been going for nearly 3 days now. Is there a way through CLI or otherwise that I can actually see what the completed percentage is? Thank you.

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• Zend Server Cannot restart PHP: permission denied for user

  - by user30115

  When I click "Restart PHP" in Zend Server web interface, I get this error in the logs: PHP Warning: Cannot restart PHP: permission denied for user IIS APPPOOL\DefaultAppPool. in C:\Program Files (x86)\Zend\ZendServer\GUI\application\CE\models\ZwasComponents\Util\Api\UserServer.php on line 86 Based on http://kb.zend.com/index.php?View=entry&EntryID=426 I tried to give permissions to user IIS APPPOOL\DefaultAppPool to the folder C:\Program Files (x86)\Zend\ZendServer\, however it still gives the same error. Do you know to what resources the application pool does not have permissions to?

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• Recommend alternative to tripwire?

  - by CarpeNoctem

  Looking for a host-based IDS comparable to tripwire. Preferably one that allows centralized management. Right now I use tripwire and though it works management and reporting through a central server would be ideal. I'm looking for recommendations that have actually been used and not just google results. Thanks!

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• BGP Dual-As support, any RFC?

  - by Saran

  Generally most of routers like cisco and junos allow a router to have dual-As to be configured via a "local-as" command which overrides the global as-number configured in "router bgp ". Also local-as prepending may or may not happen based on configurations; for example "no-prepend" in cisco. Now my question is, is there any RFC which which standardises this Dual-As support?? Which provides guidelines on whether or not to prepend the "local-as" to As-Path attributes in the Bgp updates ?

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• How to pin either a Shortcut or a Batch file to the new Windows 7 Taskbar?

  - by Shaharyar

  We are having trouble adding our batch scripts to the new Windows 7 taskar. Our batchfiles take some arguments and just execute other application based on those arguments . To keep it simple, we created some shortcuts for our customers which they just need to click in order to get everything running. The question here is: How can we pin those shortcuts or batch files to the taskbar? (The customers aren't supposed to access the file system and that's why they can only see the taskbar)

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• Mysql Servers for Attendance System

  - by foo

  I'm building an attendance system. There are about 20 places where people will check in and check out using Mifare 1K Card. It will use MySQL as the database. The system will display something like "#ID IN: 800AM" when the first time the user checks in and "#ID OUT: 400PM" when the user checks out. For this to work, all the databases need to be synchronized with each other all the times. For an example, if user A went to location #1 to check in but by the time he wants to return home, the server at location #1 went down, he needs to go to location #2 or the nearest server to check out. The server at location #2 should display '#ID OUT: 400PM" and not "#ID IN: 400PM" since he's already checked in. So, what should I use to ensure this idea will work? My main concern is with the network (other department manages it) which is very unpredictable. It just love to go down anytime it wants to. Update LOL, didn't realize my question is not clear, just noticed it when you guys pointed it out, sorry about that. My real question is, how can I configure my MySQL to be synchronized with each other (20 servers)? MySQL cluster ? (tried reading about it, but I'm not sure if it's the right thing to do) My current setup (first phase): Local database for each server OS: Slackware A main server that keeps track which staff is at which server A web based front end for the user to see their history (which connects to the server based on their records) Main Pros No worries about network problems since it is a local database Main Cons A user can only check in and out at the same server. Databases/Servers are not connected with each others. Have to add the user to each server if the users want to check in at different locations. Which means, if he wants to go to location A, he must be checked out from location A first and then check in at location B. The server at location B didn't know that the user has checked in before at A. By the way, I've already centralized my NTP to a local server. About the network, let's just say, I don't have the authority to make changes so that the network will be better. The network won't effect all 20 servers at once, usually, just a few of them for several times a week. If there are anything else you would like me to answer, please just ask.

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• How to configure non-admin account to install updates for Java, Adobe Acrobat Reader on Windows 7?

  - by MadBoy

  How to configure non-admin users to allow them to install updates for Java and Adobe Acrobat Reader without needing for administrator password on Windows 7. Updates for Microsoft products install without problems. This can be Active Directory (Windows 2003) solution, or computer based (employable through GPO or login script).

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• Assign IP's to certian mac addresses in dd-wrt

  - by MrStatic.

  I have a Linksys WRT54G/GL/GS that I am running DD-WRT v24-sp2 (10/10/09) vpn - build 13064 on it and for the life of me I can not find a way to assign ip's based on Mac address. Basically I have a few laptops and Windows really has no decent way to have separate profiles for each network.

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• Is there any DNS that supports Geo-location / Directional DNS?

  - by Devrim

  At ultradns.com or on comwired.com you can select multiple A records depending on location; x.com (United States) 174.1.1.1 x.com (Europe) 65.2.2.2 So requests are routed based on proximity/where they come from. You can do that as many times as you like, which is a great service for our distributed application needs. However, we want to manage this on our own servers. Do you know any linux package that does this ?

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• Internet Explorer wont open docx files, saves them as zip

  - by David Gard

  I have several docx documents on an Intranet for my work, but IE8 refuses to open them, instaed only saving them as a zip (filename_docx.zip). This seems to be only an IE8 problem (surprise, surprise!) as both FF and Chrome open the documents just fine. Unfortunately as this is work based, I cannot simply drop IE as I would, in favour of a decent browser. Does anybody know how to fix this issue in IE? Thanks.

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• What are the best tools to make screencast video tutorials?

  - by understack

  I've a webpage with small image based jquery animated tutorial for kids. Size of the DIV displaying animation is 640x425. What would be the best tool to capture this animation as video? I want to upload this video on Youtube. Probably some tool which would allow me to select display area dimensions would be useful.

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• Gmail Alternative

  - by Shishant

  Hello, I am looking to move from gmail to another email service provider because I am concern with privacy and I dont trust google after watching few videos on youtube. Is there any desktop or web based alternative that does this things: Threaded messaging like in gmail? In mail translation (If threaded messaging is really good then I can opt it out) Thank You.

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• what video technology does mixergy.com use for its interviews?

  - by mga

  I know it is Mac-based but I have not been able to find it in my Mac (LOL). An example of a video chat taken with "the technology" is available in this link: http://mixergy.com/amy-jo-kim/ Thanks

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• Can I run my win7 on another machine with different motherboard?

  - by pukipuki

  I want to have my system with me in another city. I know that it strongly depends of my chipset. I have P35 (Gigabyte P35DS3R). Another machine also Intel-based but chipset is G31 (MSI G31TM-P35). Is it possible that my system will start on that machine if I will plug in my hdd?

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• Where's Windows XP standard MIDI SoundFont?

  - by Neo

  I'm trying to find the standard SoundFont used in WindowsXP's MIDI Wavetable Synthesizer. I don't know if I get this right, but there seems to be a set of Roland Sound Canvas samples used in XP's wavetable synthesizer. I looked for a SoundFont based on these samples, but either there is none in my Windows installation, or the MIDI playback works in a different way. Anyone has an idea where to look for it?

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• Installing a Software From The Server!! HELP!

  - by user282659

  I've need to install a software (NetOpSchool Software and a Antivirus) and I have a server client based set of computers which is connected. I want to know how to install a software from the server other than installing it one by one in the client machines.

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• Firefox default download per extension

  - by Michael

  Is there any extension or way to make firefox silently download files to designated locations based on their extensions? I know I can use download managers in order to accomplish this, however, I want to know if there is such way without them, just using firefox+extension.

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• Where can I buy Server Type Motherboards with more than 2 Processor Sockets?

  - by roygbiv

  I'm looking for server type motherboards that have more than 2 processor sockets. Where can I find these types of boards? Edit - Prefer Intel Xeon based if possible, however, AMD Opteron is ok too.

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• Twitter - Looking for a TweetDeck alternative

  - by John2496

  I'm looking for an alternative to TweetDeck with all the same features but with a different interface. I'm not a big fan of column-based designs.

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• Is it possible to open server ports on TUN devices?

  - by JosephH

  If I make a VPN connection to a server (say myvpn.com; assume this server is not behind any router/firewall) via a TUN device and open a port (say 5555), will someone else be able to connect to me via myvpn.com:5555? If not, is there a tunneling software that does exactly this in a transparent manner? i.e. run any TCP/UDP-based server instance behind a router without NAT using another remote server.

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