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  • Storage replication/mirror over WAN

    - by galitz
    Hello, We are looking at storage replication between two data centers (600km apart) to support an active-passive cluster design for disaster recovery. The OS layer will be mostly Windows Server 2003/2008 with some OpenSuSE Linux used for performance monitoring on VMWare or possibly XenServer. The primary application service to replicate is Nvision. Datacenter 1 will have two storage systems for local active-passive or perhaps active-active replication with Datacenter 2 used as a last resport disaster recovery site. We have a handle on most aspects, but I am looking for specific recommendations on storage platforms that can handle remote replication cleanly. Thanks.

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  • Is it possible to cause artificial network packet loss or latency?

    - by nbolton
    I'm trying to reproduce some issues on a deployed application where the MSSQL server and client are running in two separate machines. I think there may be network issues between the two machines, so I'd like to try and reproduce these conditions on two Hyper-V virtual machines (on the same virtual server). Of course, the network for these virtual machines is "local" so it's actually far from the conditions in a live environment. Is there a program I can run on either virtual machine which will degrade the network performance? Or maybe any other work arounds? For example, one way to reproduce the conditions may be to run the VMs on separate Hyper-V servers in geographically dispersed locations (so the SQL traffic goes over VPN or something) -- but this is a little long winded I think. There must be a simpler way.

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  • What are optimal strategies for using mapreduce and other applications on the same server?

    - by user45532
    I have two applications that I need to run continuously to process data. 1.) An app that processes and aggregates information from sources 2.) A mapreduce workflow* that processes the above info I've thought about either getting vps hosting or getting my own inexpensive server and using xen to split the resources of the server. Getting a quad core box with 2 GB of Ram seems a lot cheaper than the grid options I've seen at slicehost, rackspace and others...

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  • Deploying virtual machines - Windows Guest/Linux Host or vice versa?

    - by samoz
    I'm looking to deploy several virtual machines for users. They need access to both Windows and Linux. They also need to use the computers graphics card (for Photoshop, modeling, etc) under Windows. My question is, will an Ubuntu host/Windows guest or a Windows host/Ubuntu guest be faster? I'm somewhat worried about Windows getting a cluttered registry and slow, but on the otherhand, a Windows host would have direct access to hardware (Unless I'm just unaware of how to grant hardware access to a guest). Does the choice of software (VMware or VirtualBox) effect the choice?

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  • Unable to SSH into ESXi 4.1 host - "Access Denied"

    - by Andrew White
    I am unable to SSH into an existing ESXi server. I have a user which is in the "root" and "users" group and is able to connect via vSphere. However after enabling "Remote support (SSH)", attempting to connect by putty and entering my username/password when prompted I am presented with an "Access Denied" message. I have run through the options presented at this KB article to no avail. I have taken down the firewall on the machine (it is remote) temporarily to check if this helped - no change. The username/password are definitely correct and I can obviously get connectivity if I am presented with the username/password prompt. I am at a bit of a loss what else I can try. Thanks all

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  • Cloud hosting and single hardware point of failure?

    - by PeterB
    From talking to sales I thought Rackspace Cloud was running on a SAN and compute nodes (as VMWare's offerings do), only to find out it doesn't, so when the host server goes down for maintenance all cloud servers on the server go down (in our case for 2.5 hours). I understand Amazon EC2 also has this single-server point of failure. Which cloud hosting solutions don't rely on a single server? I've yet to find a list by architecture Is there a term that distinguishes between these types of 'cloud'? Is one of these 'grid computing' and the other 'virtualisation'? Can a SAN backed solution provide the same reliability as 2 mirrored cloud servers on (say) Rackspace Cloud? I am more familiar with the VMWare architecture and would like to understand the advantages and disadvantages of each approach. I understand the standard architecture is to have multiple cloud servers and mirrored data between them; until we need multiple database servers I'm wondering if a SAN/node hosting solution would provide the lack of downtime we need without the added complexity.

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  • In a Virtual Machine, is the Virtual Processor using RAM or part of the Processor?

    - by Jason H
    I am running a 15" MacBook Pro (2.66GHz) and 4GB of RAM. I am considering downgrading to a 13 MacBook Pro (2.4GHz) with 8GB of RAM. Most of what I do at work is through Windows and I need to run it virtually. So my real question is when running a virtual machine will the virtual processor be utilizing RAM or part of the hosts processor? My assumption is that it will utilize the allocated RAM but I have seen zero documentation to support that.

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  • How to automatically start VM created by virt-manager?

    - by Jeff Shattock
    I have created a virtual machine with virt-manager that runs on kvm/qemu. The machine works well when started through virt-manager. However, I would like to be able to start and stop the VM through a script in init.d, so that it comes up and down along with the host. I need to have virt-manager show that the machine is running, and to be able to connect to its console through there. When I use the command line that is produced by running ps -eaf | grep kvm after starting the vm through virt-manager, I get some console messages about redirected character devices, but the machine does start and runs properly. However, I do not get any indication from virt-manager that it has started. How can I modify the command line to get virt-manager to pick up the running VM? Is there anything else about the command line that should change when starting outside of virt-manager? Command line is (slightly reformatted for readability): /usr/bin/kvm -S -M pc-0.12 -enable-kvm -m 512 -smp 1 -name BORON \ -uuid fa7e5fbd-7d8e-43c4-ebd9-1504a4383eb1 \ -chardev socket,id=monitor,path=/var/lib/libvirt/qemu/BORON.monitor,server,nowait \ -monitor chardev:monitor -localtime -boot c \ -drive file=/dev/FS1/BORON,if=ide,index=0,boot=on,format=raw \ -net nic,macaddr=52:54:00:20:0b:fd,vlan=0,name=nic.0 \ -net tap,fd=41,vlan=0,name=tap.0 -chardev pty,id=serial0 -serial chardev:serial0 \ -parallel none -usb -usbdevice tablet -vnc 127.0.0.1:1 -k en-us -vga cirrus

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  • Can I select which folders the Photos live tile chooses from?

    - by nhinkle
    The built-in Photos app in Windows 8 has a live tile on the start screen that shows photos from your pictures library. It's a cool little visual, even if it's not particularly useful. The problem is that a lot of image files on my computer are not really photos per se -- I have a lot of screenshots, PNGs of technical drawings, graph images, etc. Those all look pretty awkward on the start screen. I look pretty awkward on the start screen too... sometimes photos like resume profile shots show up that I don't want to delete, but they're not really what I want to be staring at when I start my computer up. I'm looking for some way to configure which folders the Photos app should look in for images to display on the live tile. That way, I could point it to some directories of pretty scenic pictures I've taken, and not have to see graphs and my own mug. For the time being, I've just disabled the live tile (right click - disable live tile), but I would ultimately like to have this functionality, just with more control over it.

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  • Starting VM as an executable with as low overhead as possible

    - by Robert Koritnik
    Is there a solution to create a virtual machine and start it by having an executable file, that will start the machine? If possible to start as quickly as possible. Strange situation? Not at all. Read on... Real life scenario Since we can't have domain controller on a non-server OS it would be nice to have domain controller in an as thin as possible machine (possibly Samba or similar because we'd like to make it startup as quickly as possible - in a matter of a few seconds) packed in a single executable. We could then configure our non-server OS to run the executable when it starts and before user logs in. This would make it possible to login into a domain.

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  • KVM vs Hyper-V. Which hypervisor is best for windows guests?

    - by user198851
    I am currently testing openstack for windows guests (XP and 7). I have deployed openstack "all in one" on system with following specs Processor corei5. (4 physical cores and 8 Threads with HT Technology) RAM 8 GB. HD 500 GB. I have created 4 windows xp guests with 512MB RAM and 1VCPU. On each windows guest i have installed visual studio 2008 only. In nova.conf CPU Over-Commit ratio is 2 for better performance (as mentioned in openstack operation guide). Using KVM as hyerpvisor. I have observed poor performance when simultaneously using visual studio in four windows instances. How i can improve performance ? Should i use KVM or Hyper-V ? or any other suggestion ?

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  • Slow Transfer Speeds from KVM host to client

    - by indian maiden
    I am trying to isolate the root cause of slow transfer speeds from my host OS to a KVM client. Both are Linux. Rsync on the host 192.168.1.72 rsync -auv --progress rut3.img /tmp/ [54.09MB/s] Rsync to the client: rsync -auv --progress rut3.img 192.168.1.80:/tmp/ [25.52MB/s] I realize that there will be some TCP overhead on the transfer but over 50%? Can someone enlighten me on what could be slowing down the transfers so much?

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  • VPN server on Windows Server 2008 for a small office

    - by cmbrnt
    I'm going to refurbish the IT-infrastructure for a small organization with one single office, and I'm not sure what VPN server to use. In your opinion, would the built-in Windows Server 2008 VPN server suffice or are there any specific problems with it as opposed to, for example, OpenVPN? I'd rather run a Windows native VPN server, but if there are few (preferably free) good alternatives, I could install VMware ESXi and virtualize both Windows and an OpenVPN-server. By the way, because of a low budget this office runs a solution with only one physical server. Any advice would be great to help me grasp this field of which I'm quite a novice. Thank you!

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  • Maintaining a set of (virtual) windows XP machines

    - by Frank Meulenaar
    I have a small set (currently 3, going to 6, not going to be more than 10) of (virtual, vmware workstation) windows XP machine's. They are similar but not exactly the same. I'm currently rolling out windows updates etc by hand: start machine 1, update, close, etc; I'd like to review the updates first before the clients can install them. Incidentally there are also other updates to be performed: changes some files on all machines, install new Java versions, etc. What's a good way of doing this automatic? I tried to search for this but things like Active Directory seem overkill to me.

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  • iptables, forward traffic for ip not active on the host itself

    - by gucki
    I have kvm guest which's netword card is conntected to the host using a tap device. The tap device is part of a bridge on the host together with eth0 so it can access the public network. So far everything works, the guest can access the public network and it can be accessed from the public network. Now the kvm process on the host provides a vnc server for the guest which listens on 127.0.0.1:5901 on the host. Is there any way to make this vnc server accessible by the ip address which the guest is using (ex. 192.168.0.249), without interrupting the guest from using the same ip (port 5901 is not used by the guest)? It should also work when the guest is not using any ip address at all. So basically I just want to fake IP xx is on the host and only answer/ forward traffic to port 5901 to the host itself. I tried using this NAT rule on the host, but it doesn't work. Ip forwarding is enabled at the host. iptables -t nat -A PREROUTING -p tcp --dst 192.168.0.249 --dport 5901 -j DNAT --to-destination 127.0.0.1:5901 I assume this is because the IP 192.168.0.249 is not not bound to any interfaces and so no ARP requests for it get answered and so no packets for this IP arrive at the host. How can make it work? :)

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  • Booting a native Windows install in Virtualbox: is it possible?

    - by Aron Rotteveel
    I am looking for something similiar to Bootcamp. Currently, I run Ubuntu Maveric as my primary operating system and run Windows 7 in Virtualbox. For some tasks, however, running Windows virtualized just seems to result in too much overhead and speed loss, and I'd like to be able to boot natively. The ideal situation would be to setup Windows and Ubuntu in dual boot on seperate partitions, with the ability to boot the Windows partition in Virtualbox on Ubuntu as well. Is this possible? Also, how it is that Bootcamp seems to be the only system capable of this?

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  • Hyper-V VM's cannot access Host resources, and vice-versa

    - by Agent
    I have several Hyper-V vm's running on this Win2008 R2 Server box, and up until a reboot of the host server, all the VM's were able to access shared folders on the host. Now, they can't even ping the host server. From what I've seen, I need to setup an Internal only network through Virtual Network Manager in Hyper-V. I set this up, then tried to enable the Microsoft Virtual Network Switch Protocol option in this Internal Only NIC, but I get popups saying: Your current selection will also disable the following features: Microsoft virtual network switch protocol Which is absolutely stupid, considering the protocol is what I'm ticking the checkbox to Enable! As of now, on the host, I have 2 NICs: Physical - This NIC on the host machine does have the MVNS protocol enabled Virtual Network Adapter - Created through Hyper-V Virtual Network Manager as an External type of network. Trying to enable MVNS on this NIC also produces the error above. I've tried enabling Client for Microsoft Networks on the physical NIC for IPv6, but everytime I do that, all the VMs lose Internet connectivity and I cannot RDP into them. Anything else I can try?

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  • How to add a VM Server to a VM Domain when the host is not on that domain.

    - by Charlie
    I have created A VM running Windows Server 2008 R2, using VMWare. I have configured this as a domain controller running a Windows Server 2008 domain. I have also created another VM running Windows Server 2008 R2. The HOST machine is using Windows 7 Professional 64 bit. When I try to add the second VM into the domain that the first is the DC for it fails as the VM cannot contact the DC. Simple question really. What have I missed? Is it something to do with the configuration on the Host machine? What do I need to do to enable this scenario? Thanks

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  • ubuntu 12.04 kvm virtual server network setup, can't get the machine to be connectable

    - by xyious
    I have worked on my Ubuntu Server host for weeks now and I just can not manage to get the virtual machines into the network.... here's what I need to do: I need to be able to create virtual machines that have IP addresses that can be reached from the outside (192.168 network). I need to be able to connect to the virtual machines through ssh, ftp, http and preferably https, anything else doesn't matter that much. So far everything seems simple enough and I have a lot of leeway in terms of IP address range and server/client configuration. I have the option of taking part of a /24 net as most IPs aren't used, and if it's absolutely necessary I have the option of creating a new /24 subnet. Also have the option of reformatting and reinstalling OS on the host and recreating the virtual machines as nothing has been done other than trying to get virtual machines to work. I would prefer if the virtual machines were just part of the normal network which would be 192.168.5.0/24. The host machine has 2 network cards so I don't even necessarily need the Host to be connectable in the same /24 network. I have tried (I think) just about everything from about 5 different tutorials on bridging (giving br0 the same IP that eth0 used to have (Host is able to connect to VM and vice versa, VM doesn't have outside network access), having eth0 set up like it always was and having br0 have a different IP (same as above), NAT with port forwarding (which I would have preferred not to use but will if it works), turning off one of the hosts network cards and just using one of them, different subnets.... etc. I do know my way around iptables fairly well.... Host is 64bit Ubuntu Server 12.04, using libvirt/kvm. edits: Local network is 192.168.5.0/24, host has static ip 192.168.5.254, GW .5.1 which is also nameserver. We have a second Local network at 192.168.10.0/24 with .10.1 GW, but both hosts and VMs were supposed to go into the .5 subnet. The .10 subnet isn't required, but it wouldn't be horrible if the Host were only accessible in the .10 subnet.

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  • KVM guest storage difference with NBD and NFS

    - by WojonsTech
    I am setting up my own little private cloud for my own use maybe for a project or to. I am using linux kvm on debian 6. I have 3 servers 2 of them for compute nodes and 1 storage node. I would I have already installed kvm made a few test machines got my networking setup. I have 2 nics on each server 1 nic is for web traffic other nic is for network traffic. My first Idea was to use NFS for storing the guest machines which can range in size, maybe 8gb maybe 100gb, it just depends. I was doing have heard of nbd before seems like it could work but I dont know what the performance differences are and if it will effect my enviroment, nfs looks like it will be easier to use.

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  • Create a home virtual network

    - by Tom Lisc
    I can't seem to get answers to this question. I want to setup up 2-3 computers in my house to run Linux based virtual machines fed from my dedicated Arch Linux server. I need them to have full sound and video support. At my workplace we use VMware (View), but that is too cost prohibited for me to deploy for my wife and the two 10 year olds. I have tried Virtualbox machines and they are fine, but I cannot get sound working. Any help/hints would be greatly appreciated.

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