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• Ubuntu 12.04 3.2 Kernel showing incorrect "cache size" in cpuinfo?

  - by Tom G

  2x Xeon E5620 . 16 Cores altogether. /proc/cpuinfo shows cache is only @ 4096kb According to intel this should have 12MB of "smart cache". Doing searched for E5620 and CPUinfo shows the correct number: cache size : 12288 KB However mine shows this: processor : 15 v endor_id : GenuineIntel cpu family : 6 model : 44 model name : Intel(R) Xeon(R) CPU E5620 @ 2.40GHz stepping : 2 microcode : 0x1 cpu MHz : 2400.104 cache size : 4096 KB fpu : yes fpu_exception : yes cpuid level : 11 wp : yes flags : fpu vme de pse tsc msr pae mce cx8 apic mtrr pge mca cmov pat pse36 clflush mmx bogomips : 4800.20 clflush size : 64 cache_alignment : 64 address sizes : 40 bits physical, 48 bits virtual Any idea on why it shows like it's missing 8MB in CPU cache? .

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• Packets marked INVALID in FORWARD rule

  - by Raphink

  I have a firewall that has 3 IP aliases on 1 physical interface. Packets get dropped between these 3 interfaces (either ICMP, HTTP, or anything else). We tracked it down to these packets being marked INVALID in the FORWARD rule and dropped due to the this rule: chain FORWARD { policy DROP; # connection tracking mod state state INVALID LOG log-prefix 'INVALID FORWARD DROP: '; mod state state INVALID DROP; mod state state (ESTABLISHED RELATED) ACCEPT; } (That is, we see the INVALID FORWARD DROP logs in dmesg) What could be causing this?

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• Will Windows 7 setup overwrite Windows 8 and Ubuntu boot records?

  - by Jens

  I have Windows 8 and Ubuntu installed, both an the same physical hd (2 partitions). Windows 8 was installed after a format, Ubuntu afterwards. I used EasyBCD to setup the boot records and the boot menu order. I want to install Windows 7 as a third operating system and just add its boot record with EasyBCD. Will there be any unwanted behavior when I install it on a third partition? I already have 100 GB of unallocated space on the disk, though have not yet made the partition. I red on this site that I should install the oldest OS first, but than I would have to do a format and start again from scratch (which I clearly do not want to do). edit: On this site, the opposite is claimed, saying it's also possible to install Windows 7 after Windows 8. However, it will restore a Windows 7 boot menu instead one of Windows 8.

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• Web server replica not working in other server

  - by user761076

  I have a Drupal installation (php+mysql) in a server, and I'm trying to copy this installation to another server with the same configuration, same physical and virtual path, same db configuration, etc. The thing is, in my new server I get the homepage to work, but not the inner pages, so I guess has something to do with rewrite (mod_rewrite is installed) (both .htaccess are the same). When I access http://localhost/myweb/content/mypage I get a 404 or a "Forbidden" if I uncomment this in httpd.conf (original httpd.conf does not have this entry): <Directory path/to/docs"> DirectoryIndex index.php index.html Options Indexes FollowSymLinks AllowOverride None Order allow,deny Allow from all </Directory> Any clue? Thank you

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• How to use your computer to save the world?

  - by Francisco Garcia

  Sometimes I miss the "help other people" factor within computer-related fields. However, there are little things that we all can do to make this a better place—beyond trying to eradicate annoying stuff such as Visual Basic. You could join a cloud computing network such as World Community Grid to fight cancer, write a charityware application such as Vim, improve office IT infrastructure to support telecommuting and reduce CO2 emissions, use an ebook reader to save paper, ... What else can we do to help others? Which projects can have the biggest impact?

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• Changed array composition, mdadm --detail still shows the old array size

  - by Prody

  I have a machine with 8 disks. I installed it with my hoster's install automation (it's OVH, I don't have physical access to it). The machine installed correctly, but it made an array that I wanted to change. It created a raid5 array across 5/8 disks and I've changed it to raid10 across 8 disks. I've done this by first --stopping the old array and then --creating the new array. It warned me that a previous array was there, but I chose to continue. So it created the array, spent 10ish hours syncing it and now that it's ready I get this strange behavior: When I fdisk p on it, I see the correct size. But when I mdadm --detail it I see the old array's size even tho I get the new composition and level. When I try to pvcreate on it, i get the old size again for some reason. Did I have to do something else? Did I miss something?

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• Network Block Device (NBD) clients for Windows or similar solutions

  - by przemoc

  Are there any NBD clients for Windows? Strangely, I cannot find any, or I am searching for them in a wrong way. Such client should be possibly a driver with front-end tool (may be a command-line one) allowing to create virtual drives and associate them with given hosts (or simply localhost) and ports where NBD servers are listening. From user perspective virtual drive should be close to what physical drive is, so it should be accessible as something like \\.\PhysicalDriveX (maybe \\.\VirtualDriveX?), be visible in Disk Management (diskmgmt.msc) and mountvol tools at least. (The only thing I found remotely close to NBD on Windows is ImDisk's proxy mode and companion tool devio, but AFAIK ImDisk only works at partition level (so no virtual drive) and devio uses different protocol.) Secondary question is: Are there any (preferably simple) Windows-specific solutions allowing creation of virtual drive delegating read/write request to user-space via some explicit way (like via TCP, IPC, DLL implementing given API, etc.)?

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• Whats the deal with python?

  - by gmatt

  My interests in programming lie mainly in algorithms, and lately I have seen many reputable researchers write a lot of their code in python. How easy and convenient is python for scientific computing? Does it have a library of algorithms that compares to matlab's? Is Python a scripting language or does it compile? Is it a great language for prototyping an algorithm? How long would it take me to learn enough of it to be productive provided I know C well and OO programming somewhat? Is it OO based? Sorry for the condensed format of questions, but I'm very curious and was hoping a more experienced programmer could help me out.

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• What type of security problems are mitigated by this .NET architecture?

  - by Jonno

  Given the following physical layout for a .NET web application: DB (sql server, windows) - No public route (no table access, only stored procs) Web Service DAL (iis, windows) - No public route (can be accessed by web server via port 80 and 443) Web Server (iis, windows) - Public route (only via port 80 and 443) What type(s) / examples of attack could be used to compromise the public web server but would be blocked by the Web Service DAL? i.e. can you think of concrete attack types that the DAL stops? Please note, I am interested only in the security aspect, not scaling / fault tolerance / performance / etc. In my mind if the web server has been compromised using an attack over port 80/443, then the same attack would work over port 80/443 to the Web Service DAL box.

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• gcc options for fastest code

  - by rwallace

  I'm distributing a C++ program with a makefile for the Unix version, and I'm wondering what compiler options I should use to get the fastest possible code (it falls into the category of programs that can use all the computing power they can get and still come back for more), given that I don't know in advance what hardware, operating system or gcc version the user will have, and I want above all else to make sure it at least works correctly on every major Unix-like operating system. Thus far, I have g++ -O3 -Wno-write-strings, are there any other options I should add? On Windows, the Microsoft compiler has options for things like fast calling convention and link time code generation that are worth using, are there any equivalents on gcc? (I'm assuming it will default to 64-bit on a 64-bit platform, please correct me if that's not the case.)

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• Is it possible to put only the boot partition on a usb stick?

  - by Steve V.

  I've been looking at system encryption with ArchLinux and i think I have it pretty much figured out but I have a question about the /boot partition. Once the system is booted up is it possible to unmount the /boot partition and allow the system to continue to run? My thought was to install /boot to a USB stick since it can't be left encrypted and then boot from the USB stick which would boot up the encrypted hard disk. Then I can take the USB key out and just use the system as normal. The reason I want to do this is because if an attacker was able to get physical access to the machine they could modify the /boot partition with a keystroke logger and steal the key and if they already had a copy of the encrypted data they could just sit back and wait for the key. I guess I could come up with a system of verifying that the boot has been untouched at each startup. Has this been done before? Any guidance for implementing it on my own?

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• Configure iptables with a bridge and static IPs

  - by Andrew Koester

  I have my server set up with several public IP addresses, with a network configuration as follows (with example IPs): eth0 \- br0 - 1.1.1.2 |- [VM 1's eth0] | |- 1.1.1.3 | \- 1.1.1.4 \- [VM 2's eth0] \- 1.1.1.5 My question is, how do I set up iptables with different rules for the actual physical server as well as the VMs? I don't mind having the VMs doing their own iptables, but I'd like br0 to have a different set of rules. Right now I can only let everything through, which is not the desired behavior (as br0 is exposed). Thanks!

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• Do you lose everything when you have a hard disk failure in a multi-hard disk LVM that does NOT use RAID?

  - by user72630

  I'm debating about using LVM for a media/file server because I would like to combine multiple physical hard disks into one volume. I do not wish to use any RAID in my LVM so my question is: If one of the multiple hard disks in my volume were to go down would I lose all my data or would I just lose the data that was stored on that individual disk? Also, if I were to just lose the data on the individual disk, would it be as simple as replacing that disk and restoring what was on it from a backup to recover? Thanks everyone.

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• What is the largest flatscreen monitor available for PC use?

  - by Avery Payne

  I'll qualify this specifically (by order of preference): must have the highest diagonal measurement, widescreen or "normal" aspect ratio doesn't matter here, just the diagonal. must have the highest resolution available, which means 72 inches of 1280x1024 won't cut it. must not have a TV tuner built into it, I'm not looking for a TV set, this is a monitor! must be available at a retail outlet that caters to the general public, i.e. Best Buy, Sears, Costco (all of these examples are in the U.S., although you can suggest something from whatever chain is in your area/nation/geography). Non-retail or non-physical venues like eBay, or businesses that only cater to other businesses, do not qualify under this requirement. I should be able to walk into this place and purchase it, not just whip up an order online. If you are unsure about this requirement, just ask yourself: can I physically see it before I open my wallet and purchase it?

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• df-h command in ubuntu

  - by Esha Sharma

  I am a new user of Ubuntu. When I type df -h in terminal , it gives me list of all storage devices and space usage. In my system I get this. Filesystem Size Used Avail Use% Mounted on /cow 934M 173M 761M 19% / udev 925M 4.0K 925M 1% /dev tmpfs 374M 856K 373M 1% /run /dev/sdb1 7.5G 2.8G 4.8G 37% /cdrom /dev/loop0 1.5G 1.5G 0 100% /rofs tmpfs 934M 16K 934M 1% /tmp none 5.0M 0 5.0M 0% /run/lock none 934M 76K 934M 1% /run/shm /dev/sda 299G 74M 299G 1% /media/q I understand that /dev/sda is my hard drive which is 320 gb(in gib it is 299 and hopefully that is what is being displayed) and /dev/sdb1 is pendrive of 8gb from which I am running the live cd. My question is what are the other folders and what is the physical location of these folders if complete memory is taken by the device dev/sda?

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• Nginx load distribution and multi-domain SSL

  - by Steve Clark

  I'm researching into the best methods of two new parts of our infrastructure, hopefully finding a single solution for both. 1) We're currently running a single application server, and we're going to be adding an additional application server and load balance between the two. 2) We handle a few thousand domains across the application server(s), and we're looking to support SSL. The best method i've come across so far is using nginx for it's Load Distribution to serve the requests to the application servers, and for it's SSL support. If a request is using SSL, nginx accepts the request on, terminates SSL and pipes to apache (app servers). Now, that's all good, but i'm yet to figure out how we can let nginx handle multiple domains using SSL. We're potentially looking at using UCC SSL Certs, so we can support 150 domains on a single certificate, with each cert on a single IP. I'm all new to this (My experience is just with physical load balancers and a single domains on SSL), so any advice would be very much appreciated.

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• Design Question

  - by dturner71

  Can I have two independent Connection servers attached to the same vCenter server? Here's my scenario. I'm setting up View 4 to provide desktops to two seperate Windows domains that are on different IP subnets seperated by a firewall. One cluster of physical servers, one vCenter server, linked clones. As I understand it View Connection server has to be a member of a Windows domain in order for quickprep to work. So the way to provide desktops to both Windows domains is to have a Connection server in each one right? Then open ports in the firewall so the Connection server from the other subnet can communicate with vCenter. Any reason why this won't work? Or is there a better way to accomplish it?

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• Recovering database files from a corrupted VHD

  - by Apocalypse9

  We have a SQL server hosted on a virtual machine. Our hosting company updated/restarted the server and for some reason the virtual machines became unbootable. We've spoken to Microsoft and used a few higher level tools to attempt to recover the virtual machines but were unsuccessful. In browsing the file system the database folder doesn't even appear. I'm wondering if there are any lower level tools that might be able to find and copy the database files. As far as I know the physical hard drive is ok, so I'm hoping there may be some way to recover the files themselves even if the rest of the virtual machine file-system is a loss. Obviously we're in a bit of a bind, and any help/ suggestions are very much appreciated.

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• Iozone: sensible settings for a server with lots of RAM

  - by Frank Brenner

  I have just acquired a server with: 2x quadcore Xeons 48G ECC RAM 5x 160GB SSDs on an LSI 9260-8i Before deploying the target platform, I'd like to collect as much benchmark data as possible, testing I/O with hardware RAID in various configurations, ZFS zRAID, as well as I/O performance on vSphere and with KVM virtualization. In order to see real disk I/O performance without cache effects, I tried running Iozone with a maximum file of more than twice the physical RAM as recommended in the documentation, so: iozone -a -g100G However, as one might expect, this takes far too long to be practicable. (I stopped the run after seven hours..) I'd like to reduce the range of record and file sizes to values that might reflect realistic performance for an application server, hopefully getting the run times to under an hour or so. Any ideas? Thanks.

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• Is it possible to run a "Windows Server 2008 R2 SP1 Hyper-V Virtual Machine" on Windows 7x64 Pro machine?

  - by tbone

  Specifically, I want to run this: http://www.microsoft.com/en-us/download/details.aspx?displaylang=en&id=27417 This download contains a three Windows Server 2008 R2 SP1 Hyper-V Virtual Machine set for evaluating and demonstrating Office 2010, SharePoint 2010 and Project Server 2010. System requirements Supported operating systems: Windows Server 2008 R2 Additionally you will need: •Windows Server 2008 R2 (SP1 recommended) with the Hyper-V role enabled. •Drive Formatting: NTFS •Processor: Intel VT or AMD-V capable •RAM: 8 GB or more recommended •Hard disk space required for install: 100 GB ------------------------- So, the above text seems to indicate that you need a physical Windows 2008 Server (r2) server running, but from the googling I've done on the subject I've yet to come across a discussion that definitively answers the question. Many posts I've read seem to indicate it might be possible to run it on Windows 7 using one of the following: VirtualBox, Windows Virtual PC, VMWare but I'm not entirely sure.

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• how to set up domain name, bad request invalid hostname

  - by user45645

  assume i have a domain name which will be forwarded to my public ip (web server) automatically. in IIS 6, ip is public ip port is 6666, advanced - host value is www.hello.com firewall is open for 6666(web server port) and 53(DNS port), DMZ of router is my physical address in DNS, i have already had a zone called oldhello.com. And i expect a new domain name. So i have addded a new zone called hello.com and checked SOA server (P) is one.hello.local. then added a new host called one, full name is one.hello.com, ip address 192.168.7.3(my address in router) and then add a alias(CNAME) www, full name is www.hello.com, FQDN i choose the host i added before (one.hello.com) i expected that when i type the public ip in browser, can it be changed to domain name automatically. if not set host value www.hello.com, use public ip i can see the web however, after set up host value www.hello.com, browser show bad request invalid hostname

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• What to see in India as a developer and student

  - by lasseespeholt

  Hi, I'm planning a trip to India around July-August. And I want to hear Indian developers or developers traveled to India if there are something interesting to see in India (around Bombay) for developers in general. Maybe a conference etc. I have looked at http://www.conferencealerts.com/computing.htm I have studied computer science in a year now but have been a spare time and independent developer for some years now. Furthermore, I have tried finding summer courses but that is properly too late now and computer science summer courses is hard to find in India. Best regards, Lasse Espeholt

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• why don't more programming languages have builtin interfaces to the window manager?

  - by Naveen

  Programming is at the heart about automating tasks on a computer. Presumably those tasks would normally be done manually by a human. Humans use the computer through the keyboard, mouse, and interaction with the console or the window manager. But very few languages have built in functions that provide an interface to these basic computing objects. A notable exception is autohotkey, an open source language on windows, providing builtin functions that allow the following simple tasks: * Get Pixel Information * Get mouse position * Keyboard macros * Simulate key strokes * Simulate mouse click * Window management See examples on rosettacode. There have been various attempts on linux, many of which were stopped without explanation. One is the inactive tcl library: android. Search google code for android, lang:tcl

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• Install Windows with QEMU

  - by Radium

  I want to understand if it is possible to install Windows from Qemu to a physical HDD. I was trying to do that by doing something like this: qemu-system-x64 -m1024 -vnc :1 -hda /dev/sda -cdrom .../Windows.iso Installed successfully. But when i tried to boot normally got a blue screen telling me that a hardware change appeared so go away. I guess the problem is not because of QEMU-CPU emulation or smth, but because of HDD`s UID change which is used inside of Windows registry. Am i right? So if yes how to workaround this? Maybe i need to prepare Windows before the reboot? I have successfully installed FreeBSD via QEMU and thought with Windows it will go the same ...

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• I screwed up, exit in .bashrc

  - by camel_space

  I put "exit" in my .bashrc file. I don't have physical access to the machine so to connect to it I use ssh. I don't have root privileges. Every time I connect to the server, the connection automatically closes. So far, I've tried: Overwriting .bashrc with scp and sftp. The connection closes before I can do anything. Using a few different GUI programs to access ssh (connection closes) Overwriting the file with ftp. (can't use ftp) From my home computer $ ssh host "bash --noprofile --norc" (connection closes) $ ssh host "mv .bashrc bashrc_temp" (connection closes) $ ssh host "rm .bashrc" (same thing) $ ssh host -t (connection closes) Is there anything I can do to disable .bashrc or maybe overwrite the file before .bashrc is sourced?

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