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• mdadm - Recovering a 'split' RAID1 array

  - by Hamza

  I have two drives that used to be part of a single RAID1 volume but it appears that one of them went offline for some time, something I've noticed just now when I rebooted my system. I now seem to have two RAID volumes, as reported by: # cat /proc/mdstat Personalities : [linear] [multipath] [raid0] [raid1] [raid6] [raid5] [raid4] [raid10] md126 : active raid1 sdc[1] 2096116 blocks super 1.2 [2/1] [_U] md127 : active (auto-read-only) raid1 sdb[0] 2096116 blocks super 1.2 [2/1] [U_] unused devices: <none> Not exactly sure where to go from here. How can I merge and re-sync these volumes without data loss? Thanks.

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• Mirroring svn repository

  - by cardy

  I have an svn repository and I'd like to have it duplicated over multiple machines for availability purpose. By now when my vps goes down, I'm unable to connect to repository and this is very annoying. Easiest (and expansive) solution is to setup two identical machine and make them work like clones. I'd like to know if there are any alternative (involving 2 machines). Ideally I would have two vps in different datacenters, so if one goes down I can rely on the other. Thanks. I need a mirror both for read and write not only for read. Svn Repos are berkley-db based

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• FTP upload stalls at same point every time on FileZilla

  - by John

  On two different FTP accounts, I am having problems uploading files. I can login and see the contents of the dir, and start an upload. Using Filezilla the transfer seems to always stall at either 0.9% or 1.2% (always those two numbers) and may simply hang, or keep restarting and then again stop at the same point. WindowsXP FTP is not great but I get similar types of problems there... it starts uploading and after a short while I get a timeout error. FTP used to work fine, and I don't know if it's these accounts in particular (both have the same service provider although purchased on opposite sides of the world) or if "FTP is broken on my PC"... can that even happen?!

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• Can a virtual mikrotik box bridge a hyper-v internal network with a hyper-v external network?

  - by mcfrosty

  I am trying to set up a Mikrotik router as a transparent firewall on my network. I got the machine working on a hardware MT box, but my boss wants the MT virtualized. I have been trying the set up where my virtual windows box talks to the Mikrotik via private or internal network on the Hyper-V host. I can get the two machines to talk, but as soon as I set up a bridge on the MT, all traffic ceases between the two. Is it possible to create a bridge for this purpose (having the MT silently in front of my firewalled server)? I could really use some help.

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• How long do uploaded files stay in the tmp folder in Linux Ubuntu?

  - by Jean-Nicolas Boulay Desjardins

  I am building a web application where my users will be able to upload files. After the files are uploaded I need to send the files to two other servers, and after they will be deleted from the server where they were just uploaded to. I am wandering is it a good I idea to keep the uploaded files in the tmp/ folder the time the uploaded files are sent to the other two servers or should I move them to another folder incase they get deleted? I am also wandering because I would like to know if I have to build a cron script to get rid of the files that have been transfered to the other servers so that I get my disk space back.

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• Filtering Client IP from Access Log for Urchin

  - by Ram Prasad

  I have some apache logs to process, and since the webserver behind two levels of reverse proxies, I am getting two IPs in the X-Forwarded-For header.. for example: 208.34.234.55, 127.0.0.1 - - [29/Oct/2009:21:38:13 -0500] "GET /monkey.html HTTP/1.0" 200 20845 0 0 "http://www.monkey.com/" "Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.0.15) Gecko/2009101601 Firefox/3.0.15 (.NET CLR 3.5.30729)" Now, how do I filter this in Urchin (or remove this in Apache logging) so, 127.0.0.1 is removed from processing. Currently urchin is not able to recognize the multuple IP address so it does not log the remote IP

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• Error while trying to configure VLAN with Open vSwitch

  - by Abhishek Chanda

  I am trying to connect a number of VMs using Open vSwitch. The VMs are on two separate physical boxes. Here is what I did: Created two tap devices on one physical host sudo ip tuntap add mode tap tap0 and same for tap1 Bring them up sudo ip link set tap0 up Add them as ports to Open vSwitch (br0 was created as a OVS bridge previously) sudo ovs-vsctl add-port br0 tap0 tag=1 Now I booted the VMs (using VirtualBox) and assigned addresses 192.168.122.11 and 192.168.122.12. Now when I try to ping one VM from another, I get the error Connect: network is unreachable. Since both VMs are connected to the switch on the same VLAN, I expect to be able to ping one from another. What is going wrong here?

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• USB forwarding from dom0 to domU

  - by Karolis T.

  What are my options to forward two USB connected phones to xen guest? I've read about PCI-passthrough http://www.wlug.org.nz/XenPciPassthrough, but I'm sure usb controller in the server isn't a pci card. There's device level forwarding, but I need to forward two devices, this here doesn't say how to do it: http://www.olivetalks.com/2008/02/03/usb-forwarding-on-xen-it-just-does-not-work/ Would something as simple as: usbdevice = [ 'host:xxx', 'host:yyy', ] work? EDIT: I'm now starting a bounty. This is really important for me and for other people also, hoping someone who have this resolved will be able to help.

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• Windows Server 2003 guest on Xen frequently stops responding

  - by smokris

  I'm running a Windows Server 2003 guest instance in Xen 3.x. This DomU runs fine for a day or two, then stops responding — I don't get any network response, and I can no longer connect to Xen's VNC console for this DomU. xm list shows this: Name ID Mem VCPUs State Time(s) Domain-0 0 6508 8 r----- 1161159.4 [A working Linux DomU] 1 512 1 -b---- 68711.1 [The hung Windows DomU] 5 512 1 ------ 67234.2 [Another working Linux DomU] 3 512 1 -b---- 163036.4 (What does the ------ mean? The xm manual explains what each of the six states mean, but not what no-state means.) If I xm destroy and then xm create the Windows DomU again, it boots right back up (with the Windows alert The previous system shutdown at [...] was unexpected.), and then stops responding after another day or two. I checked /var/log/xen/*.log, but no log messages are generated at the time the server stops responding. How should I proceed in troubleshooting this?

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• Nginx rewrite rules, some work, some don't

  - by Lawrence Goldstien

  Here are the two rewrite rules: This one works rewrite ^/knowledgebase/([0-9]+)/[a-z0-9_-]+.html$ /./knowledgebase.php?action=displayarticle&id=$1 last; This one doesn't rewrite ^/announcements/([0-9]+)/[a-z0-9_-]+.html$ /./announcements.php?id=$1 last; There is no difference between the two as far as I can see. The url to be rewritten for announcements is: /announcements/2/New-Site-Design.html And should be rewritten to: /announcements.php?id=2 I really can't see how the announcements one doesn't work compared to the knowledgebase one. Any tips would be greatly appreciated.

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• misaligned raid partition in Ubuntu 10.04

  - by Linux Jedi

  I attached two identical hard drives to my linux machine. Then using gparted I formated the first 1024 mb at the beginning of each drive as linux swap space. Then I went into system-administration-disk utility. In there I went to file-create-RAID array. I selected the remaining space in each of the two identical hard drives and created a striped raid array. After the array was created, a warning message appeared. It said "The partition is misaligned by 522240 bytes. This may result in very poor performance. Repartitioning is suggested." What do I do now? As far as I can tell, the partitions are identical.

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• Is there a limit on the number of USB external drives?

  - by Beska

  I've got three external HDDs, all My Books, 500 GB, 750 GB, and 1 TB. If I hook one or two of them up to a computer, everything seems fine. If I hook all three of them to a computer (I've tried this on two different computers, one running Windows XP, one running Windows Vista), the bootup time goes up by more than an order of magnitude. It can suddenly take about 10-20 minutes to boot the machine, whereas before it might take a minute. All three drives work fine on their own. I'm not using any kind of hub; all three are plugged directly into the machine. Is this associated with some kind of inherent limit in USB? Is this bad hardware design in the CPU box? Is this a My Book problem?

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• iPhone VPN to iTunes Home Sharing

  - by Philip Crumpton

  my goal is to set up a VPN on a Windows machine that contains my iTunes library then connect to that VPN with my iPhone and be able to utilize Home Sharing remotely. I have read that this can easily be set up if the iTunes library is on a Mac (Network Beacon and YazSoft ShareTool are two products I quickly found). I can't find anyone who has had success on a Windows machine, though. In my thinking, there are two options (aside from buying a Mac): 1.) Existing utility that takes care of this for me (like the Mac-only options listed above) and is compatible with iPhone (Hamachi is NOT compatible with iPhone VPN) 2.) Manually configure a VPN to allow Bonjour multicast (can't find any information on this) FYI my router is a Linksys WRT54GL running Tomato 1.28

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• How to format the not used OS partition?

  - by Eslam

  I have two operating systems on two different partitions, & I want to format the not used partition. When I right-click on it to choose format, the formatting process doesn't complete & a message appears saying (windows was unable to complete the format). So I need to know another way to format this partition Note: I use windows xp sp2, & i use partition (D) & i want to format the (C) & i don't know how to do that through command line, if it possible i will be so grateful Thanks

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• Is it safe to use a single switch for multiple subnets?

  - by George Bailey

  For a moment, forget about whether the following is typical or easy to explain, is it safe and sound? Internet | ISP supplied router x.x.x.1 (public subnet) | switch-------------------------------------+ | (public subnet) | (public subnet) BVI router (switch with an access list) NAT router | (public subnet) | (private subnet 192.168.50.1) +--------------------------------switch----+ (both subnets) | | computer with IP 192.168.50.2 ------+ +----computer with IP x.x.x.2 I don't plan to implement this setup, but I am curious about it. The 50.2 computer may send a packet to the x.2 computer, but it will use 50.1 as the router, since 50.2 knows that the subnet is different. Would this result in the packet being received twice by the x.2 machine, first directly through the switch, second by way of the two routers? Do you see any problems with this aside from how confusing it is, and that it would put one switch doing the work of two subnets?

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• How can I copy a SQL Azure Database to a server on a different subscription?

  - by Tragedian

  I'm trying to create a copy of a SQL Azure database. The source and destination servers are associated with two different subscriptions, but they are located in the same data-centre. I've been reading Copying Databases in Windows SQL Azure Database and How to: Copy Your Databases (Windows Azure SQL Database) for instructions on this, but I'm not sure if my scenario is covered. I would like to use the CREATE DATABASE Database1B AS COPY OF Database1A; command, but I don't know what the implications are on the accounts used, or what I need to set up between the two databases before this command is possible. Has anybody achieved this type of copy and can elaborate?

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• Is there a media player that allows me to group together radio streams which are just mirrors of the

  - by rakete

  I find it really annoying that for some radio stations, which have two or more servers to cope with the network load, there is not one single entry in amaroks playlist but two or more entries. This makes it hard to pick the radio station from the list I like to listen to because all the entries are always shown with the last played track as name, and even if I only have a few radio stations in my list there will eventually be many different entries. And, if I use the keyboard shortcuts to navigate the playlist I always have to remember that radio station X has for example four entries in the playlist, so I have to press the shortcut for switching tracks four times to actually switch the to the next station. Now, ideally I would like some solution for amarok, but if someone knows of another media player that does this or something I would appreciate that information as well.

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• HP DL160 G6 memory PC3-10600R vs PC3-10600E

  - by Jeremy Hajek

  I am using a HP DL 160 G6 server that according to specs takes PC3 Registered or Unbuffered. When I combine the two types of memory below the system will not POST. When I use just the first type of memory listed the system will POST. I have two pieces of HP memory that came with the server labeled PC3-10600E-9-10-E0 and then I have some Crucial memory labeled PC3-10600R-9-10-B0 I wager that the R means Registered memory and the E means ECC - then shouldn't the crucial memory boot with the system according to the HP specs? Or does the E mean it is Unbuffered and therefore I shouldn't mix and match as according to this HP memory config doc?

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• In Varnish, is it normal for the number of freed bytes to be 60% of those allocated?

  - by user331397

  I have an installation of Varnish 3.02 on an Amazon EC2 Medium Linux instance in front of two relatively low-traffic websites. After an uptime of 2 hours, there are 3400 objects in the cache. Using varnishstat, I checked the variables SMA.s0.c_bytes and SMA.s0.c_freed, which I assume correspond to the total number of bytes allocated since startup and the number freed, respectively. No objects should have had time to expire during these two hours, but still about 60% of the memory allocated since startup (330MB out of 560MB) has already been freed. Do you know if this is normal? If not, do you know what kind of configuration could be wrong?

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• Sharing internet through a wireless ad-hoc in Windows 7

  - by vzait

  I'm actually requesting a workaround to share a PPoE wired Internet connection between two laptops using wireless. I've tried sharing it the usual way... New Ad-hoc = Click turn On sharing = etc. I've tried changing all the settings I could find related to the two networks on both machines. Conclusion: Sometimes it works, sometimes it doesn't. Is it really buggy, or are my hands growing from the wrong place? I'm almost sure I'm not the only one having this kind of problem. What is the easiest/correct workaround ?

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• How do I hookup a dual video card Crossfire rig to a single monitor?

  - by Alexed

  I just received a new Alienware box preinstalled with two nice shiny ATI 6950 graphics cards. My goal is to use both of them to give me really good resolution and frame rate on my single monitor. There's zero documentation with the Alienware box and nothing I can find online. Do I just plug the monitor into one of the cards, and expect the two cards to do magic internally? The ATI Crossfire website indicates a need for an "external crossfirex connection cable". Do I need to buy one of these? If so, what kind of cable is it? The AMD Catalyst Control Center shows the second card as "Linked" but when I go to the AMD Overdrive section, the second card is at zero temperature, and clock, suggesting it's not actually doing anything. What do I need to do to make use of both cards? Is it something that doesn't kick in until I do something graphically intensive?

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• Accesing internet with Host-Only network VirtualBox

  - by Bibo

  I have two VMs in my VirtualBox. Both are FreeBSD and should communicate between each other. I have created network with DHCP enabled and set like this: Server Address 10.10.10.1 Server Mask 255.255.255.0 Lower Address Bound 10.10.10.100 Upper Address Bound 10.10.10.200 My VMs are pinging each other and getting right ip adress. This is what I must have and can´t change. Now I want to access internet from one VM and I found that I must use two network cards but I don´t know how to set the second one. I am new with VirtualBox and this stuff so if you count with this in you answer I would appreciate that. And I have Windows 8 as host system if it´s matter.

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• Host http:// and https:// for same domain on separate IIS servers

  - by The Talking Walnut

  Is it possible to host http://example.com and https://example.com on two separate IIS servers?

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• Virtualizing Firewalls/UTM

  - by TheD

  So Sophos UTM (Astaro Gateway UTM) can be virtualized in Hyper-V, VMWare, vSphere etc. Now I'm new to virtualization, so am wondering how the networking would be configured in this situation. Imagine the following (a very simple setup). A Zyxel router acting as the default gateway, standard ADSL line. This is connected directly via Ethernet to my VHost, Hyper-V in my case. Now I assume I need two virtual network adapters, one which is the "External" interface to the firewall, and the other being the "Internal" interface. But where does my switch go, since I have 5 machines (or X number of machines). Where is the switch connected, to the internal interface on the VHost? What default gateway do my clients use etc? How would the routing work if these two interfaces weren't bridged since they are virtual networks anyway. I'm a little confused! Any advice is much appreciated! Cheers

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• my.cnf in server directory, why

  - by Mellon

  On my Ubuntu machine, I have installed MySQL . I notice that there are /etc/my.cnf file which contain the content (only two lines): innodb_buffer_pool_size = 1G max_allowed_packet = 512M While there is also /etc/mysql/my.cnf with a long content like: # The MySQL database server configuration file. ... ... For me, it looks like both are configurations for MySQL server, but Why there are two my.cnf in different locations, can't the content to be merged to one my.cnf ? What is the purpose to have seperate my.cnf for MySQL server ?

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