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• Disaster Recovery Example

  Previously, I use to work for a small internet company that sells dental plans online. Our primary focus concerning disaster prevention and recovery is on our corporate website and private intranet site. We had a multiphase disaster recovery plan that includes data redundancy, load balancing, and off-site monitoring. Data redundancy is a key aspect of our disaster recovery plan. The first phase of this is to replicate our data to multiple database servers and schedule daily backups of the databases that are stored off site. The next phase is the file replication of data amongst our web servers that are also backed up daily by our collocation. In addition to the files located on the server, files are also stored locally on development machines, and again backed up using version control software. Load balancing is another key aspect of our disaster recovery plan. Load balancing offers many benefits for our system, better performance, load distribution and increased availability. With our servers behind a load balancer our system has the ability to accept multiple requests simultaneously because the load is split between multiple servers. Plus if one server is slow or experiencing a failure the traffic is diverted amongst the other servers connected to the load balancer allowing the server to get back online. The final key to our disaster recovery plan is off-site monitoring that notifies all IT staff of any outages or errors on the main website encountered by the monitor. Messages are sent by email, voicemail, and SMS. According to Disasterrecovery.org, disaster recovery planning is the way companies successfully manage crises with minimal cost and effort and maximum speed compared to others that are forced to make decision out of desperation when disasters occur. In addition Sun Guard stated in 2009 that the first step in disaster recovery planning is to analyze company risks and factor in fixed costs for things like hardware, software, staffing and utilities, as well as indirect costs, such as floor space, power protection, physical and information security, and management. Also availability requirements need to be determined per application and system as well as the strategies for recovery.

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• Why does Public Folder share prompt for password even after I set "Turn off password protected sharing"

  - by cmaduro

  I have a fileserver on a WORKGROUP which I have created a share on. I have turned on public folder sharing, file and printing sharing and set password protected sharing to off. When I try to share the folder by right clicking it and selecting proerties, then selecting sharing tab, then clicking the "share" button, then clicking share, it prompts me asking wether or not I want to turn on network discovery for public network, and after I say either yes or no, it says that my folder cant be shared. When I try to share via advanced sharing, then the folder is shared, and it's status is set to shared. However when I try to access this folder from a computer on the same network, it prompts me to enter a username and password. I am trying to setup a share for my VMware ThinApp packages that can be access no matter what domain the users are on.

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• Turning my mobile boardband into Wifi with my laptop using Kubuntu 12.04 to use it in my desktop PC

  - by Suhail cholassery

  Its been 3 or 4 months since I started using 12.04. What I want to do is very clear: Turn my mobile broadband connection into Wifi connection with my laptop using Kubuntu 12.04 to use it in my desktop PC. I browsed through most of the questions related to this (ad- hoc connections, bridging mobile broadband with Wifi, etc). I also read the ICS article, but I found those too difficult to digest. I hope that there is some other way to do this. I request you to give me a practical and applicable answer . I am not trying duplicate any other existing question.

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• 2 Hard Drives.One Partition

  - by Nick

  I have two hard drives (One 500 GB and the other 750 GB). I would like to create a single partition which will include these 2 hard drives. I guess it works only with identical hard drives, correct me if I am wrong. I have these 2 drives at an old computer which I tuned and may turn it into a web server,so I'm going to install ubuntu on them. How can I make 2 or more hard drives behave as one in one partition?

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• How to use unused space in ubuntu

  - by Ravi.Kumar

  I installed ubuntu on my machine with only 80 GB of memory anticipating that I will remove it later but now I want to keep it forever (until I am frustrated with linux). I have 500 GB in my machine and now I want to use that raw 420 GB of space. How I can I do that ? with "space/memory" I am referring to secondary memory not Ram. Here is output of : sudo fdisk -l Disk /dev/sda: 500.1 GB, 500107862016 bytes 255 heads, 63 sectors/track, 60801 cylinders, total 976773168 sectors Units = sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x000dcb77 Device Boot Start End Blocks Id System /dev/sda1 * 2048 136718335 68358144 83 Linux

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• Fake RAID (dmraid) not seeing new SATA drives

  - by rausch

  I have three drives in my machine, one SSD with 32GB and two 1TB drives, attached to an Intel 82801JI (ICH10) SATA AHCI Controller. The problem is, that I can access only one of the 1TB drives when the other one is not plugged in. When it is plugged in I see the drives as sda and sdb, but there seem to be no partitions. Looking at these drives with cfdisk, the partitions are there, though. Both of the 1TB drives are carrying a partition, being part of a software RAID1, created with mdadm. Before I threw the SSD into the mix, the other two have been working fine. Any hints?

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• Moving 11.10 complete system to a new bigger Harddisk

  - by pl1nk

  I would like to move my current installation of Ubuntu 11.10 to a bigger harddisk, since the old one is failing. I would like to avoid solutions like dd block copying (since there would be unused space at the end) with something cleaner, but I'm open to suggestions. Partitions info: Size Used Avail Use% Mounted on Partition type Encrypted 19G 9.9G 7.6G 57% / ext4 59G 50G 6.2G 90% /home ext4 Yes What is the best way to accomplish such a task, preferably with advantages/disadvantages.

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• Globacom and mCentric Deploy BDA and NoSQL Database to analyze network traffic 40x faster

  - by Jean-Pierre Dijcks

  In a fast evolving market, speed is of the essence. mCentric and Globacom leveraged Big Data Appliance, Oracle NoSQL Database to save over 35,000 Call-Processing minutes daily and analyze network traffic 40x faster.  Here are some highlights from the profile: Why Oracle “Oracle Big Data Appliance works well for very large amounts of structured and unstructured data. It is the most agile events-storage system for our collect-it-now and analyze-it-later set of business requirements. Moreover, choosing a prebuilt solution drastically reduced implementation time. We got the big data benefits without needing to assemble and tune a custom-built system, and without the hidden costs required to maintain a large number of servers in our data center. A single support license covers both the hardware and the integrated software, and we have one central point of contact for support,” said Sanjib Roy, CTO, Globacom. Implementation Process It took only five days for Oracle partner mCentric to deploy Oracle Big Data Appliance, perform the software install and configuration, certification, and resiliency testing. The entire process—from site planning to phase-I, go-live—was executed in just over ten weeks, well ahead of the four months allocated to complete the project. Oracle partner mCentric leveraged Oracle Advanced Customer Support Services’ implementation methodology to ensure configurations are tailored for peak performance, all patches are applied, and software and communications are consistently tested using proven methodologies and best practices. Read the entire profile here.

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• windows hosted networok on windows 8

  - by tanmaysingh

  my sister is using Acer laptop, that has an intel WLAN card and supports windows hosted network(checked in command prompt).Am using the basic way using netsh wlan command also, then am using netsh start wlan command.The hosted network gets created and it could b seen in "Network and Sharing Center" as the . I also went to Device manager, selected WLan card, made sure"allow this device to wake computer from sleep" is selected. Now I went to the newly created , clicked properties, and under sharing enabled allow this to be shared(but I am not able to select The name of the wifi my sis wants to share (in this case her college wifi name, LEts say QP4,Ethernet and Local Area connection are the only two option that are coming). Also the SSID name is not being shown in her mobile nor when I click the tower icon at the tray area,Any suggestions on what might be going wrong?She is using windows 8. Should I look for updated drivers? Her laptop is only 6 months old, i don't think the drivers are outdated. Any advice shall be appreciated.

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• Can I have a computer with 2 physical HDs, & Dual boot option, one for Windows & one for Ubuntu

  - by Frank

  When my HD failed in my old computer with a dual core, I immediately went out and bought a new 6 core PC because I needed it for business and had to have an immediate solution. The old computer was otherwise a good computer. I don't want to spend a $100+ for a new operating system for the old computer because the Windows 7 Professional opperating system for the new computer will only allow one install. So, I decided to look and see if there were any free operating systems and found Ubuntu. I downloaded it and burned a live CD and would like to try it on the old computer. I found a 200 GB HD I can buy for $30 and the seller will format it any way I want. There are also other HDs available at a similar price. What I was thinking I would like to do is buy 2 HDs. Then I can have one formatted for Ubuntu 12.04 and install Windows XP Pro SP1 on the other HD for which I have the original installation CD. Then I would like to have a dual boot option so that when I power up the computer, I can choose whether to use Windows XP or Ubuntu. Is this possible? If so, how would I do it, that is, arrange it so a dual boot option presents itself on power up.

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• Button "Add" is disabled in VPN Connection's dialog

  - by Innuendo

  I've just installed elementaryos-jupiter. (It's based on Ubuntu 10.10) I've entered VPN Connections' menu (nm - VPN Connections - Configure VPN) And there should be button "Add" - it is, but it's disabled (I can't press on it) I'm connecting via ethernet (LAN in a students' hostel) and we get internet via VPN connection (It worked for me in Ubuntu for a few years) Any suggestions? I've asked on IRC of elementaryos (there were few people) but they said that VPN is out-of-box, and it should work - they never met this.

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• Cannot mount USB disks due to "not authorized" error

  - by shadovv

  I have Ubuntu 12.04 (.2?) installed. I don't plan to need GUI after setup so I modified the grub to start in console. However, whenever I want to start up GUI I need to type startx. Simple/basic stuff. However I seem to be hitting a snag: I am having trouble mounting/accessing USB flash drives in the GUI I started in the console. "Unable to mount location - not authorized". Seemed like it should be an easy fix, but can't figure out how I'm overlooking it. Can someone help me out?

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• Partition does not start on physical sector boundary?

  - by jasmines

  I've one HD on my laptop, with two partitions (one ext3 with Ubuntu 12.04 installed and one swap). fdisk is giving me a Partition 1 does not start on physical sector boundary warning. What is the cause and do I need to fix it? If so, how? This is sudo fdisk -l: Disk /dev/sda: 750.2 GB, 750156374016 bytes 255 testine, 63 settori/tracce, 91201 cilindri, totale 1465149168 settori Unità = settori di 1 * 512 = 512 byte Sector size (logical/physical): 512 bytes / 4096 bytes I/O size (minimum/optimal): 4096 bytes / 4096 bytes Identificativo disco: 0x5a25087f Dispositivo Boot Start End Blocks Id System /dev/sda1 * 63 1448577023 724288480+ 83 Linux Partition 1 does not start on physical sector boundary. /dev/sda2 1448577024 1465147391 8285184 82 Linux swap / Solaris This is sudo lshw related result: *-disk description: ATA Disk product: WDC WD7500BPKT-0 vendor: Western Digital physical id: 0 bus info: scsi@0:0.0.0 logical name: /dev/sda version: 01.0 serial: WD-WX21CC1T0847 size: 698GiB (750GB) capabilities: partitioned partitioned:dos configuration: ansiversion=5 signature=5a25087f *-volume:0 description: EXT3 volume vendor: Linux physical id: 1 bus info: scsi@0:0.0.0,1 logical name: /dev/sda1 logical name: / version: 1.0 serial: cc5c562a-bc59-4a37-b589-805b27b2cbd7 size: 690GiB capacity: 690GiB capabilities: primary bootable journaled extended_attributes large_files recover ext3 ext2 initialized configuration: created=2010-02-27 09:18:28 filesystem=ext3 modified=2012-06-23 18:33:59 mount.fstype=ext3 mount.options=rw,relatime,errors=remount-ro,user_xattr,barrier=1,data=ordered mounted=2012-06-28 00:20:47 state=mounted *-volume:1 description: Linux swap volume physical id: 2 bus info: scsi@0:0.0.0,2 logical name: /dev/sda2 version: 1 serial: 16a7fee0-be9e-4e34-9dc3-28f4eeb61bf6 size: 8091MiB capacity: 8091MiB capabilities: primary nofs swap initialized configuration: filesystem=swap pagesize=4096 These are related /etc/fstab lines: UUID=cc5c562a-bc59-4a37-b589-805b27b2cbd7 / ext3 errors=remount-ro,user_xattr 0 1 UUID=16a7fee0-be9e-4e34-9dc3-28f4eeb61bf6 none swap sw 0 0

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• Movement prediction for non-shooters

  - by ShadowChaser

  I'm working on an isometric (2D) game with moderate-scale multiplayer - 20-30 players. I've had some difficulty getting a good movement prediction implementation in place. Right now, clients are authoritative for their own position. The server performs validation and broad-scale cheat detection, and I fully realize that the system will never be fully robust against cheating. However, the performance and implementation tradeoffs work well for me right now. Given that I'm dealing with sprite graphics, the game has 8 defined directions rather than free movement. Whenever the player changes their direction or speed (walk, run, stop), a "true" 3D velocity is set on the entity and a packet it sent to the server with the new movement state. In addition, every 250ms additional packets are transmitted with the player's current position for state updates on the server as well as for client prediction. After the server validates the packet, it gets automatically distributed to all of the other "nearby" players. Client-side, all entities with non-zero velocity (ie/ moving entities) are tracked and updated by a rudimentary "physics" system - basically nothing more than changing the position by the velocity according to the elapsed time slice (40ms or so). What I'm struggling with is how to implement clean movement prediction. I have the nagging suspicion that I've made a design mistake somewhere. I've been over the Unreal, Half-life, and all other movement prediction/lag compensation articles I could find, but they all seam geared toward shooters: "Don't send each control change, send updates every 120ms, server is authoritative, client predicts, etc". Unfortunately, that style of design won't work well for me - there's no 3D environment so each individual state change is important. 1) Most of the samples I saw tightly couple movement prediction right into the entities themselves. For example, storing the previous state along with the current state. I'd like to avoid that and keep entities with their "current state" only. Is there a better way to handle this? 2) What should happen when the player stops? I can't interpolate to the correct position, since they might need to walk backwards or another strange direction if their position is too far ahead. 3) What should happen when entities collide? If the current player collides with something, the answer is simple - just stop the player from moving. But what happens if two entities take up the same space on the server? What if the local prediction causes a remote entity to collide with the player or another entity - do I stop them as well? If the prediction had the misfortune of sticking them in front of a wall that the player has gone around, the prediction will never be able to compensate and once the error gets to high the entity will snap to the new position.

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• How do I write to an outer truecrypt volume when the inner volume protection prevents writng?

  - by con-f-use

  In a nutshell After some time using the outer volume of a hidden volume in Truecrypt I cannot write to the outer volume anymore. The protection of the inner volume always kicks in before. How do I fix this? Details I'm using truecrypt's two layered encryption of a USB stick. The outer container carries my semi-sensitive stuff while the inner hidden values has a bit more valuable information. I use both, the inner and outer volume regularly and that is part of the problem. Truecrypt can mount the outer volume for writing while protecting the inner. Usually the inner volume, when not protected this way (or mounted read-only) would be indistinguishable from free space. That is of course part of the plausible deniability scheme of truecrypt. At the beginning, everything worked as expected. I could copy and delete data to the outer volume as I pleased. Now it seams that I have written and deleted enough data to have filled the outer volume once. Despite the write protection Ubuntu tries now to write to the continuous "free space" that is the inner volume. It does that although enough other free space is on the outer volume. But on this free space there used to be data so its fragmented and the file system write prefers continuous space. The write on the continuous free space of the outer volume of course fails (with the error message in the picture above) as Truecrypt's inner-volume-protection kicks in. The Question I know this is expected behaviour, but is there a better way to write to the outer volume that does not attempt to write to the hidden free space at the end? The whole question could be more generally rephrased to: How do I control, where on a partition data is written in Ubuntu?

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• Utility to listen on port (Windows 2003 Server)

  - by Gero

  Hi, I need to validate some network connectivity from machine X to a Windows 2003 Server machine. To be able to do so I'm looking for a simple utility that I can run on the Windows 2003 server that will listen on a specified port. It does not have to do anything else. When it listens on the specified port I can do a telnet to that port from machine X and check if all firewalls are open. The Windows 2003 Server machine is already a production machine so I cannot install all kinds of stuff. At this stage we want to ensure that all network connectivity is in place before we do the installation of the 'real' application that will listen that port (don't want to wast time debugging network connectivity issues when we do the actual deployment of the new application. The utility should be a simple command line utility that does not require any installation. What utilities do you recommend? Thanks, Gero

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• My notebook goes offline automatically after some time

  - by air

  I have about 3 computers and 1 windows 2003 server in office and 1 network printer (HP LJ 2840). My network printer is installed on the server. I an sharing this printer on all clients with windows XP. All other computers are fine only 1 HP laptop. When I start that HP laptop the printer works fine but after some time, printer goes offline and I can't print until I restart the laptop. When that laptop goes to offline mode, I can work on that laptop, I can use shared network drives, I can ping server but it shows offline mode icon in Task bar status area. If i use \\servername I can see the server's shared items and if i go to printers I can't see any printer... I try my best to solve this issue, but I can't. Thanks

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• Cannot establish ssh connection to computer on local network

  - by ovangle

  I've just (re)installed ubuntu 11.10 on my main pc, and the connection times out every time I try to ssh connect to my laptop (over the local network) to retrieve the files I backed up there. The connection times out every time I try to connect. I can establish a connection in the other direction without issue. Here's the verbose output I get when I try to connect: ovangle@ruby-EP43-DS3:~$ ssh -v [email protected] OpenSSH_5.8p1 Debian-7ubuntu1, OpenSSL 1.0.0e 6 Sep 2011 debug1: Reading configuration data /etc/ssh/ssh_config debug1: Applying options for * debug2: ssh_connect: needpriv 0 debug1: Connecting to 10.1.1.4 [10.1.1.4] port 22. debug1: connect to address 10.1.1.4 port 22: Connection timed out ssh: connect to host 10.1.1.4 port 22: Connection timed out ssh is installed on both machines, and I've tried deleting '~/.ssh/known_hosts' on both machines, still nada. I've changed the sshd logging on the laptop to VERBOSE and restarted the daemon (because I wasn't getting any relevant syslog entries otherwise), and this is the log for the most recent connection attempt. EDIT: posted wrong logs last time. They just showed that there was a connection received, they weren't actually the sshd logs (which were in auth.log as I recently discovered). Unfortunately, that log is filling up with extremely weird error messages and it gives me no information about the connection. Nov 8 16:02:18 ovangle-A6Rp pkexec: pam_unix(polkit-1:session): session opened for user root by (uid=1000) Nov 8 16:02:18 ovangle-A6Rp pkexec: pam_ck_connector(polkit-1:session): cannot determine display-device Nov 8 16:02:18 ovangle-A6Rp pkexec[6270]: ovangle: Executing command [USER=root] [TTY=unknown] [CWD=/home/ovangle] [COMMAND=/usr/sbin/gnome-power-backlight-helper --set-brightness 2] Nov 8 16:02:19 ovangle-A6Rp pkexec: pam_unix(polkit-1:session): session opened for user root by (uid=1000) Nov 8 16:02:19 ovangle-A6Rp pkexec: pam_ck_connector(polkit-1:session): cannot determine display-device Nov 8 16:02:19 ovangle-A6Rp pkexec[6273]: ovangle: Executing command [USER=root] [TTY=unknown] [CWD=/home/ovangle] [COMMAND=/usr/sbin/gnome-power-backlight-helper --set-brightness 7]

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• Network printer problem with 12.04

  - by G. He

  I had an HP LaserJet 3030 printer connected to an Ubuntu box. It worked fine with 11.10. I was able to print from Ubuntu as well as from Windows and Mac from the home network. About a month or so ago, I upgraded 11.10 to 12.04, then things started to falling apart. My Windows 7 laptop couldn't print to the printer any more. Today, I installed many updates on 12.04, hoping that would fix the printing problem. Unfortunately, it made the situation much worse. Now not only my Windows 7 laptop won't print, my XP desktop won't print either. Every time I print something from the Windows computer, the Ubuntu box logs an error message in /var/log/samba/log.'machineName' as: _spoolss_OpenPrinterEx: Cannot open a printer handle for printer \\server. It is interesting that it uses the server name as the printer, not the \\server\xyzprinter as the printer name. Anyone had a similar problem? Anyway to work around the problem?

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• NetworkManager doesn't detect my broadband device

  - by Joril

  I have a Huawei K3765 (USB ID 12D1:1520) and I'm trying to use it with Ubuntu 10.04 Lucid. I have usb-modeswitch installed, so when I plug the device I can see that it gets switched from storage-mode to modem-mode. My problem is that when I try to create a broadband mobile connection for it, NetworkManager doesn't detect the modem... I tried this on two different laptops. /var/log/daemon.log doesn't show anything of interest, AFAIKT... What could I try?

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• OSSEC HIDS Notification "Unknown problem somewhere in the system." (seems like hdd issue)

  - by John

  from what i understand somethings is wrong with hdd i am trying to find some commands in order to run some tests to check if hard disk is OK I will post a full list of logs after REBOOT of system: "Unknown problem somewhere in the system." kernel: ata2.00: failed command: READ FPDMA QUEUED kernel: res 51/40:c8:38:5c:16/00:00:00:00:00/40 Emask 0x409 (media error) <F> kernel: ata2.00: error: { UNC } kernel: ata2.00: failed command: READ FPDMA QUEUED kernel: res 51/40:78:88:5c:16/00:00:00:00:00/40 Emask 0x409 (media error) <F> kernel: sd 1:0:0:0: [sda] Sense Key : Medium Error [current] [descriptor] kernel: sd 1:0:0:0: [sda] Add. Sense: Unrecovered read error - auto reallocate failed kernel: md/raid1:md1: read error corrected (8 sectors at 1461400 on sda1) kernel: sd 1:0:0:0: [sda] Add. Sense: Unrecovered read error - auto reallocate failed kernel: sd 1:0:0:0: [sda] Add. Sense: Unrecovered read error - auto reallocate failed kernel: md/raid1:md1: read error corrected (8 sectors at 1461672 on sda1) Also some of this logs are duplicate or even more. Thanks.

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• How to allow simple file sharing on Windows Server 2008R2 through VPN

  - by Martin Wiboe

  We are a small, distributed company with a Windows Server 2008R2 installation. I would like to set up a way for our employees to connect securely to this server via VPN and then be able to map a network drive. I have gotten this to work somewhat by installing the Network Policy and Access Services Role on the server and using the default settings. I have also created a network share on the server. The problem is that our connectivity is sporadic (sometimes the service stops listening on the port or simply refuses to authorize correct credentials) and slow. I can always connect through VPN, but mapping is problematic. I would be grateful for the answer on how to accomplish this as well as some guidance on whether I am on the right track. Thanks in advance!

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• Unstable after moving headless server from usb-hdd to usb pendrive

  - by nlee

  Ubuntu server 12.04.1 running from usb-hdd is rock solid for months. After copying the partitions to a Kingston usb pendrive the system will only run for 3-4 days before some services fail. Is running 12.04.1 from usb pendrive a viable approach? How do I troubleshoot the problem? In the meanwhile, I have reverted back to usb-hdd. Willing to buy a usb pendrive that is known to work. Recommendations?

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• why does my lubuntu recognizes only lubuntu instalation cds?

  - by Hardi

  I installed lubuntu from alternate cd a month ago. Now when I needed to read some cd's, the cd try won't open. It can be opened before ubuntu boots up. It can be opened after entering sudo eject -i off from console. But it won't mount any other cd-roms, than just the lubuntu live-cd and lubuntu alternate instal cd, where it was installed from. "mount: no medium found on /dev/sr0" as output, when try to mount anything else. Problem can't be in corrupted sd's, because othe computer, did recognize them well.

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• Where is EasUS coming from?

  - by Malcolm Lawrie

  I have downloaded the Universal USB Installer and Ubuntu 12.04 Desktop as described on your site. I installed it to a 16Gb USB stick including the format option. Now when I try to boot from the stick into Ubuntu I get a couple of lines of script then a screen with EasUS Todo Backup with Backup. Recovery, Clone and Tools options, but no sign of Ubuntu starting. Where is the start Ubuntu option please? I can find no reference to EaseUS on your help pages.

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