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• DRBD as a block device for XEN VM (Centos 5.3)

  - by SaberTooth

  Hi all, I have setup a drbd resource between 2 server nodes - everything works correctly when doing sync tests between the two. (I want to create a HA cluster using drbd,xen and heartbeat) However, when I try and create a XEN VM with Centos as guest operating system, I get through to the partitioning screen on the install but when I select a partitioning type the next screen gives me the following error : "An error has occurred - no valid devices were found on which to create new file systems. Please check your hardware for the cause of this problem." This is the first time attempting create a setup like this and searching Google does not help much... my config files for DRBD and XEN.... DRBD (just the section that is pertinent) on xennode0 { device /dev/drbd0; disk /dev/sda5; address X.X.X.X:7788; flexible-meta-disk internal; } on xennode1 { device /dev/drbd0; disk /dev/sda5; address X.X.X.X:7788; meta-disk internal; } XEN kernel = "/boot/xeninstall/vmlinuz" ramdisk = "/boot/xeninstall/initrd.img" extra = "text" name = "VM" maxmem = 3000 memory = 3000 vcpus = 4 on_poweroff = "destroy" on_reboot = "restart" on_crash = "restart" vfb = [ ] disk = [ "phy:/dev/drbd0,sda1,w", "tap:aio:/srv/xen/xenswap.img,sda2,w" ] vif = [ "mac=00:16:3e:11:67:ae,bridge=xenbr0" ] root = "/dev/sda1 ro" Thanks in advance!

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• Extending partition on linux gparted but not more space in the vm

  - by Asken

  I have a vm test installation of a linux running a build server. Unfortunately I just pressed ok when adding the disk and ended up with an 8gb drive to play with. Well into the test the builds are consuming more and more space, of course. The vm drive was resized to 21gb and using gparted I expanded the drive partitions and that all worked fine but when I go back into the console and do df there's still only 8gb available. How can I claim the other 13gb I added? fdisk -l Disk /dev/sda: 21.0 GB, 20971520000 bytes 255 heads, 63 sectors/track, 2549 cylinders, total 40960000 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: 0x0006d284 Device Boot Start End Blocks Id System /dev/sda1 * 2048 499711 248832 83 Linux /dev/sda2 501758 40959999 20229121 5 Extended /dev/sda5 501760 40959999 20229120 8e Linux LVM vgdisplay --- Volume group --- VG Name ct System ID Format lvm2 Metadata Areas 1 Metadata Sequence No 4 VG Access read/write VG Status resizable MAX LV 0 Cur LV 2 Open LV 2 Max PV 0 Cur PV 1 Act PV 1 VG Size 19.29 GiB PE Size 4.00 MiB Total PE 4938 Alloc PE / Size 1977 / 7.72 GiB Free PE / Size 2961 / 11.57 GiB VG UUID MwiMAz-52e1-iGVf-eL4f-P5lq-FvRA-L73Sl3 lvdisplay --- Logical volume --- LV Name /dev/ct/root VG Name ct LV UUID Rfk9fh-kqdM-q7t5-ml6i-EjE8-nMtU-usBF0m LV Write Access read/write LV Status available # open 1 LV Size 5.73 GiB Current LE 1466 Segments 1 Allocation inherit Read ahead sectors auto - currently set to 256 Block device 252:0 --- Logical volume --- LV Name /dev/ct/swap_1 VG Name ct LV UUID BLFaa6-1f5T-4MM0-5goV-1aur-nzl9-sNLXIs LV Write Access read/write LV Status available # open 2 LV Size 2.00 GiB Current LE 511 Segments 1 Allocation inherit Read ahead sectors auto - currently set to 256 Block device 252:1

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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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• Windows XP VM on VMWare ESXi 4.1 "pausing" / blocked occasionally

  - by FelixD

  We have an issue with Windows XP SP3 VMs on VMWare ESXi 4.1.0 (the free version): They sometimes seem to "pause" for several minutes. This happens rarely (maybe once a month per VM, at least noticed only that often), but still is an issue for us. It happens for three different but similar VMs on three pretty different hosts (different hardware). I have the feeling that the "pausing" is not actually the CPU blocking, but probably the harddisks, but not 100% sure. The servers have one IDE disk (C:) and one SCSI (D:) and it might be either of the two. I have seen scheduled tasks simply not starting for up to 9 minutes and then running normally again with normal speed. They were totally blocked. This is not a load issue, the VMWare hosts have average load and the VMs in question already have reserved CPU resources plus high priorities for CPU and disk. The Windows boxes run mainly MySQL, Tomcat, FileZilla server, Cygwin stuff, Java + R applications, VMWare client, Elusiva Terminal Server pro, Nagios client. Not sure if this might be related with any of that software (e.g. Elusiva). Trying to debug this, there was nothing visible in Windows Event log, other logs in C:\Windows, VMWare events etc. Unfortunately the vmware.log file ends with "Log throttled". We found that we ran into 2 VMWare bugs there: The VMWare client writes lots on bogus messages in the vmware.log, which we now disabled (log level error setting) plus the bug that VMWare does not unthrottle the log (at least so far despite VM reboots). I know there is not much guidance and that may also be the reason why I so far didn't find anything related on the web or on ServerFault, but maybe some of this rings a bell with someone? Or please direct me to what more info to post. I hope that the vmware.logs get unthrottled eventually (can't easily restart the hosts at the moment). Thanks for any input!

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• Switch role after connecting to database

  - by Chris Gow

  Is it possible to change the postgresql role a user is using when interacting with postgres after the initial connection? The database(s) will be used in a web application and I'd like to employ database level rules on tables and schemas with connection pooling. From reading the postgresql documentation it appears I can switch roles if I originally connect as a user with the superuser role, but I would prefer to initially connect as a user with minimal permissions and switch as necessary. Having to specify the user's password when switching would be fine (in fact I'd prefer it). What am I missing?

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• SSH access to VM on windows 8 hyper-v

  - by samw

  I'm currently attending University and prefer a Linux environment to do much of my work, but all I have is a ThinkPad running Windows 8 Pro. Cygwin is nice, but it leaves me missing things like apt-get. My latest solution is to run an Ubuntu 12.04 VM with Windows 8's Client Hyper-V and use Cygwin for SSH access. I've looked everywhere online trying to set this up, but I haven't found much help. I've done this before using VirtualBox, so I figured this would be possible as well. Could anyone provide advice for setting up this environment? I'm completely uninitiated to Linux networking, virtual networking, and... pretty much all networking configuration, so this has been quite a challenge for me. What I've done so far: Created an external virtual switch to my wireless NIC. With this, I could successfully SSH to the VM with the leased IP address. But without a static IP, I would soon get disconnected. Created an internal virtual switch and attempt to "share" my main internet connection. (I was following the description on this page) Thank you all in advance!

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• VM automatic provisioning advice

  - by jdgregson

  In my lab we have 24 workstations, each with five technician-maintained virtual machines set up in VMware Workstation. These provide a lot of management overhead, as we have to update them as well as the host operating systems every three months (the start of the next quarter), which adds up to 144 systems to update instead of just 24. Whenever we need to reimage the hosts, the VMs add another 130GB to each image, which is over 3TB of extra data to send over the network, and a lot more time to apply each image, and then we still have to boot all 120 VMs and assign them a unique IP Address and host names. We would like to get the VMs off the hosts and onto a server, but after looking around for a few days, I still don't know where to begin looking for a solution. There may be a better way to do this, but in my mind, the ideal solution would be to replace the VMs on the host machines with five Thin Client operating systems, each configured to connect to a server and be sent or connected to a unique virtual machine. We can't have 120 VMs running on the server all the time, so the server would have to create a copy of the VM from a template whenever a student tries to boot one, and destroy the VM after the student is finished with it. If there is another client application that has to be installed on the hosts that would be fine, the only reason I'd like to keep them in VMware Workstation is because students already know to look there for the VMs when they need to use them. What, if any, virtualization software will allow this? Is there some other solution I'm not seeing?

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• cannot delete IPv6 default gateway

  - by NulledPointer

  The commands below should be pretty self-explanatory. Please note that the route for which i get failure is obtained by RA and has very less expiry ( e Flag in UDAe). @vm:~$ ip -6 route 2001:4860:4001:800::1002 via fe80::20c:29ff:fe87:f9e7 dev eth1 proto static metric 1024 2001:4860:4001:800::1003 via fe80::20c:29ff:fe87:f9e7 dev eth1 proto static metric 1024 2001:4860:4001:800::1005 via fe80::20c:29ff:fe87:f9e7 dev eth1 proto static metric 1024 2001:4860:4001:803::100e via fe80::20c:29ff:fe87:f9e7 dev eth1 proto static metric 1024 fd00:ffff:ffff:fff1::/64 dev eth1 proto kernel metric 256 expires 2592300sec fe80::/64 dev eth1 proto kernel metric 256 default via fe80::20c:29ff:fe87:f9e7 dev eth1 proto static metric 1 default via fe80::20c:29ff:fe87:f9e7 dev eth1 proto kernel metric 1024 expires 1776sec @vm:~$ @vm:~$ @vm:~$ @vm:~$ sudo route -6 delete default gw fe80::20c:29ff:fe87:f9e7 @vm:~$ ip -6 route 2001:4860:4001:800::1002 via fe80::20c:29ff:fe87:f9e7 dev eth1 proto static metric 1024 2001:4860:4001:800::1003 via fe80::20c:29ff:fe87:f9e7 dev eth1 proto static metric 1024 2001:4860:4001:800::1005 via fe80::20c:29ff:fe87:f9e7 dev eth1 proto static metric 1024 2001:4860:4001:803::100e via fe80::20c:29ff:fe87:f9e7 dev eth1 proto static metric 1024 fd00:ffff:ffff:fff1::/64 dev eth1 proto kernel metric 256 expires 2592279sec fe80::/64 dev eth1 proto kernel metric 256 default via fe80::20c:29ff:fe87:f9e7 dev eth1 proto kernel metric 1024 expires 1755sec @vm:~$ @vm:~$ @vm:~$ sudo route -6 delete ::/0 gw fe80::20c:29ff:fe87:f9e7 dev eth1 SIOCDELRT: No such process @vm:~$ @vm:~$ @vm:~$ route -n6 Kernel IPv6 routing table Destination Next Hop Flag Met Ref Use If 2001:4860:4001:800::1002/128 fe80::20c:29ff:fe87:f9e7 UG 1024 0 0 eth1 2001:4860:4001:800::1003/128 fe80::20c:29ff:fe87:f9e7 UG 1024 0 0 eth1 2001:4860:4001:800::1005/128 fe80::20c:29ff:fe87:f9e7 UG 1024 0 0 eth1 2001:4860:4001:803::100e/128 fe80::20c:29ff:fe87:f9e7 UG 1024 0 0 eth1 fd00:ffff:ffff:fff1::/64 :: UAe 256 0 0 eth1 fe80::/64 :: U 256 0 0 eth1 ::/0 fe80::20c:29ff:fe87:f9e7 UGDAe 1024 0 0 eth1 ::/0 :: !n -1 1 349 lo ::1/128 :: Un 0 1 3 lo fd00:ffff:ffff:fff1:a00:27ff:fe7f:7245/128 :: Un 0 1 0 lo fd00:ffff:ffff:fff1:fce8:ce07:b9ea:389f/128 :: Un 0 1 0 lo fe80::a00:27ff:fe7f:7245/128 :: Un 0 1 0 lo ff00::/8 :: U 256 0 0 eth1 ::/0 :: !n -1 1 349 lo @vm:~$ UPDATE: Another question is whats the use of link local address as the default route?

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• ERP in a Flash! Latest News on JD Edwards and Oracle VM Templates

  - by Kem Butller-Oracle

  Oracle Announces the Availability of Oracle VM Templates for JD Edwards EnterpriseOne 9.1 Update 2 and Tools 9.1 Update 4.4 Continuing the commitment to rapid and predictable deployments of JD Edwards EnterpriseOne, Oracle announces the general availability of Oracle VM templates for JD Edwards EnterpriseOne Application release 9.1 Update 2 and Tools release 9.1 Update 4.4. These templates can be used with Oracle VM for x86, on the Oracle Exalogic Elastic Cloud, and on the Oracle Database Machine. Oracle VM Templates for JD Edwards EnterpriseOne accelerate the process of setting up a working environment compared to the traditional installation process. The templates can be a key component to a well-managed cloud infrastructure, allowing system administrators to quickly provision fully functional JD Edwards EnterpriseOne environments for evaluation, development, or production use. The templates contain preconfigured images of the major JD Edwards EnterpriseOne server components, including: • Enterprise server • HTML server • Database server • BI Publisher (for use with One View Reporting) • Business Services Server and ADF Runtime (for use with Mobile Smartphone Applications) • Application Interface Services (new with this release, for use with Mobile Enterprise Applications) • Server Manager (new with this release) The virtual server images are built on a complete Oracle technology stack, including Oracle VM for x86, Oracle Linux, Oracle WebLogic Server, Oracle Database, and Oracle Business Intelligence Publisher. The templates can be installed into an Oracle VM for x86 system running on standard x86 servers, the Oracle Exalogic Elastic Cloud, and the Oracle Database Appliance as a composite “all-in-one” system. The database can be deployed as a fully preconfigured VM template, or it can be deployed to a preexisting database server, for example, the Oracle Exadata Database Machine or the Oracle Database Appliance. This latest set of templates includes the following applications and technology components: • JD Edwards EnterpriseOne Applications Release 9.1 Update 2 with ESUs as of April 8, 2014 • JD Edwards EnterpriseOne Tools 9.1 Update 4, maintenance pack 4 (9.1.4.4) • Oracle Database 12c (12.1.0.1) • Oracle WebLogic Server 12c (12.1.2) • Oracle Linux 5 Update 8, 64-bit • Oracle Business Intelligence Publisher 11.1.1.7.1, for use with JD Edwards EnterpriseOne One View Reporting • JD Edwards EnterpriseOne Business Services Server and Oracle Application Development Framework (ADF) 11.1.1.5, for use with the JD Edwards EnterpriseOne Mobile Applications. The delivery also includes a JD Edwards EnterpriseOne deployment server preconfigured to match the content of the templates. This edition of the templates also includes enhanced configuration utilities that greatly simplify the process of configuring the templates for deployment into a running system. The templates are immediately available for download from the Oracle Software Delivery Cloud. For more information see: • My Oracle Support article 884592.1 • Oracle Technology Network

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• Citrix Xen VM's lose networking

  - by Ash

  My client has a XenServer 6.0.2 installation with 2 Window Server 2008 R2 virtual machines. Whenever the virtual machines are rebooted they lose their IP settings (IP address, subnet, gateway). Each time after a reboot I need to login to each VM via XenCenter and re-apply the required static IP settings. This causes issues with connected iSCSI drives within each VM - drives need to be reconnected after each reboot. For example, a network adapter has the following settings pre-reboot: Description . . . . . . . . . . . : Citrix PV Ethernet Adapter #0 Physical Address. . . . . . . . . : C6-FB-A2-4F-2C-F3 IPv4 Address. . . . . . . . . . . : 10.101.0.101(Preferred) Subnet Mask . . . . . . . . . . . : 255.255.255.0 Default Gateway . . . . . . . . . : 10.101.0.10 DNS Servers . . . . . . . . . . . : 10.101.0.100 NetBIOS over Tcpip. . . . . . . . : Enabled Post-reboot: Description . . . . . . . . . . . : Citrix PV Ethernet Adapter #0 Physical Address. . . . . . . . . : C6-FB-A2-4F-2C-F3 Autoconfiguration IPv4 Address. . : 169.254.153.174(Preferred) Subnet Mask . . . . . . . . . . . : 255.255.0.0 Default Gateway . . . . . . . . . : DNS Servers . . . . . . . . . . . : 10.101.0.100 NetBIOS over Tcpip. . . . . . . . : Enabled Under XenCenter -- Virtual Network Interfaces, each adapter is set to a static MAC address (i.e. "Use this MAC address"). I have tried the following commands within one VM but this had no effect: netsh winsock reset catalog netsh int ip reset Can someone please help?

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• Network speed between a VM and another machine which is not residing on the same host, is 11MB/s at most

  - by Henno

  Problem Network speed between a VM and another machine which is not residing on the same host, is 11MB/s at most. Topology Facts ESXi5 version is 5.0.0.504890 VM has the latest Vmware Tools installed VM is using E1000 network driver Physical box has Win Srv 2008 R2 as the OS CrystalDiskMark says the drive on physical box can read/write 100MB/s vCenter is another vm on esx both vm and physical box are showing 1Gbps link speed Configuration Networking shows vmnic0 as 1000 Full NTttcp is a client/server tool from Microsoft for measuring pure network throughput Here's what I've done so far: Test1: VM is running Filezilla FTP Server (default settings, one user account made) Physical box is running Filezilla FTP Client (default settings) Physical box is uploading a big file to FTP server Transfer speed (as observed by Windows Task Manager on both machines): ~11MB/s (bad) Physical box is downloading that file from FTP server Transfer speed (as observed by Windows Task Manager on both machines): still ~11MB/s (bad) Could it be disk performance issue? Test2: Physical box is running ntttcpr.exe -a 6 -m 6,0,VM_IP_ADDRESS VM is running ntttcps.exe -a 6 -m 6,0,PHY_BOX_IP_ADDRESS Transfer speed (as observed by Windows Task Manager on both machines): ~11MB/s (bad) Could it be switch performance issue? Test3: physical box is running vSphere Client I open Summary Storage datastore Browse Datastore... from physical box and upload a file to datastore Transfer speed (as observed by Windows Task Manager on physical box): ~26-36MB/s (good) Could it be a vm specific issue? Test4: Installed ntttcp to another vm on the same esx server Measured network performance between vms on the same esx server with NTttcp Transfer speed (as observed by Windows Task Manager on physical box): ~90-120MB/s (excellent :) Test5: I have another esx server on the same site, connecting to the same datastore and same switch. Those two ESX servers have both 2 NICs. One NIC goes to switch while the other goes directly to the other ESX server. vMotioned one of the testing vms off to the other ESX host Measured network performance between vms on different esx servers with NTttcp Transfer speed (as observed by Windows Task Manager on physical box): ~11MB/s (bad) While I'm aware of these: ESXi 4.1 slow file transfer ESXi 5 network performance is slow Debian Etch and ESXi slow network speeds VMWare ESXi slow file copy to guest they did not help (or I must have been missed something)

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• How to (properly) back up a live QEMU/KVM VM?

  - by Roman

  I'm currently engineering a backup solution for KVM VM's as an additional measure to traditional backups. Unfortunately, all currently (August 2013) existing solutions I came across so far either: do not ensure a consistent backup of the VM (losing RAM state, creating a dirty image, or other things), or require lengthy downtime (complete VM shutdown while backing up). I'm aware of QEMU/libvirt's functionality of taking snapshots, however, it's not yet usable since: image-internal snapshots present you with an ever-changing image file, resulting in a likely dirty backup (assuming one uses qcow2 images at all). one cannot yet merge a currently active external snapshot into the original backing image ("blockcommit"). Out of the above reasons, I'm now implementing a script that: Saves the VM's state and halts it Sets up a devicemapper snapshot(s) where the VM's disk images and state reside Resumes the VM Mount the snapshot(s) of step 2. Backs up the VM's disk and state (configuration for convenience) Merges back the snapshot(s). If I got everything right, this will take consistent backups of VM's with only seconds (if at all, since 1-3 is fast, possibly sub-second) of downtime. Of course, when restoring, the VM will be way in the past, but at least giving me the option of an orderly shutdown/reboot. Am I missing something with this solution? Or has someone indeed already implemented this?

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• Membership in ASP.Net applications - part 1

  - by nikolaosk

  So far in all my posts, I have never mentioned anything about how to implement authentication/authorisation mechanisms in a web site. In all our professional web applications we do need some sort of mechanism to verify who are users are and what privileges have in our site. This is the first post in a series of posts investigating how to implement membership (authentication+authorisation) in ASP.Net applications. We will look into the built-in web server security controls.We will look at the built...(read more)

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• How to find virtualization performance bottlenecks?

  - by Martin

  We have recently started moving our C++ build server(s) from real machines into VMs. (MS Hyper-V) We have some performance issues that I've currently no idea how to address. We have: Test-Box - this is a piece of desktop workstation hardware my co-worker used to set up the VM before we moved it to the actual server hardware Srv-Box - this is the server hardware Test-Box-Real - This is Windows running directly on the Test-Box HW Test-Box-VM - This is Windows in a Hyper-V VM on the Test-Box HW Srv-Box-Real- This is Server2008R2 running on the Srv-Box HW. Srv-Box-VM- This is Windows running in a Hyper-V VM on the Srv-Box HW, i.e. on Srv-Box-Real. Now, the problem is that we compared Build times between Test-Box-Real and Test-Box-VM and they were basically equal (within about 2%). Then we moved the VM to the Srv-Box machine and what we saw there is that we have a significant performance degradation between Srv-Box-Real and Srv-Box-VM, that is, where we saw no differences on the Test HW we now do see major differences in performance on the actual Server HW. (Builds about ~~ 50% slower inside the VM.) I should add that both the Test-Box and the Srv-Box are only running this one single VM and doing nothing else. I should also note that the "Real" OS is Win2008R2(64bit) and the VM hosted OS is Wind2003R2(32bit). Hardware specs: Srv-Box: Intel XEON E5640 @ 2.67Ghz (This means 8 cores with hyperthreading on the Real system and "only" 4 cores on the VM, since Hyper-V doesn't allow for hyperthreading, but number of cores doesn't seem to explain the problem here.) 16GB RAM (we have 4GB assigned to the VM) Virtual DELL RAID 1 (2x 450GB HUS156045VLS600 Hitachi 15k SAS drives) Test-Box: Intel XEON E31245 @ 3.3GHz 16GB RAM WD VelociRaptor 600GB 10k RPM SATA Note again that I'm only concerned with the differences between Srv-Box-Real and Srv-Box-VM (high) vs. the differences seen btw. Test-Box-Real and Test-Box-VM (low). Why would one machine have parity when comparing VM vs Real performance and the other (server grade HW no less) would have a large disparity? (Both being XEON CPUs ...)

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• Development Environment in a VM against an isolated development/test network

  - by bart

  I currently work in an organization that forces all software development to be done inside a VM. This is for a variety of risk/governance/security/compliance reasons. The standard setup is something like: VMWare image given to devs with tools installed VM is customized to suit project/stream needs VM sits in a network & domain that is isolated from the live/production network SCM connectivity is only possible through dev/test network Email and office tools need to be on live network so this means having two separate desktops going at once Heavyweight dev tools in use on VMs so they are very resource hungry Some problems that people complain about are: Development environment runs slower than normal (host OS is windows XP so memory is limited) Switching between DEV machine and Email/Office machine is a pain, simple things like cut and paste are made harder. This is less efficient from a usability perspective. Mouse in particular doesn't seem to work properly using VMWare player or RDP. Need a separate login to Dev/Test network/domain Has anyone seen or worked in other (hopefully better) setups to this that have similar constraints (as mentioned at the top)? In particular are there viable options that would remove the need for running stuff in a VM altogether?

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• Writing a VM - well formed bytecode?

  - by David Titarenco

  Hi, I'm writing a virtual machine in C just for fun. Lame, I know, but luckily I'm on SO so hopefully no one will make fun :) I wrote a really quick'n'dirty VM that reads lines of (my own) ASM and does stuff. Right now, I only have 3 instructions: add, jmp, end. All is well and it's actually pretty cool being able to feed lines (doing it something like write_line(&prog[1], "jmp", regA, regB, 0); and then running the program: while (machine.code_pointer <= BOUNDS && DONE != true) { run_line(&prog[machine.cp]); } I'm using an opcode lookup table (which may not be efficient but it's elegant) in C and everything seems to be working OK. My question is more of a "best practices" question but I do think there's a correct answer to it. I'm making the VM able to read binary files (storing bytes in unsigned char[]) and execute bytecode. My question is: is it the VM's job to make sure the bytecode is well formed or is it just the compiler's job to make sure the binary file it spits out is well formed? I only ask this because what would happen if someone would edit a binary file and screw stuff up (delete arbitrary parts of it, etc). Clearly, the program would be buggy and probably not functional. Is this even the VM's problem? I'm sure that people much smarter than me have figured out solutions to these problems, I'm just curious what they are!

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• PARTNER WEBCAST (June 4): Enhance Customer experience with Nimble Storage SmartStack for Oracle with Cisco

  - by Zeynep Koch

  Live Webcast: Enhance Customer experience with Nimble Storage SmartStack for Oracle with Cisco A webcast for resellers who sell Oracle workloads to customers  Wednesday, June 4, 2014, 8:00 AM PDT /11 AM EDT  Register today Nimble Storage SmartStack™ for Oracle provides pre-validated reference architecture that speed deployments and minimize risk.  IT and Oracle administrators and architects realize the importance of underlying Operating System, Virtualization software, and Storage in maintaining services levels and staying in budget.  In this webinar, you will learn how Nimble Storage SmartStack for Oracle provides a converged infrastructure for Oracle database online transaction processing (OLTP) and online analytical processing (OLAP) environments with Oracle Linux and Oracle VM. SmartStack delivers the performance and reliability needed for deploying Oracle on a single symmetric multiprocessing (SMP) server or if you are running Oracle Real Application Clusters (RAC) on multiple nodes. Nimble Storage SmartStack for Oracle with Cisco can help you provide: Improved Oracle performance Stress-free data protection and DR of your Oracle database Higher availability and uptime Accelerate Oracle development and improve testing All for dramatically less than what you’re paying now Presenters: Doan Nguyen, Senior Principal Product Marketing Director, Oracle Vanessa Scott , Business Development Manager, Cisco Ibrahim “Ibby” Rahmani, Product and Solutions Marketing, Nimble Storage Join this event to learn from our Nimble Storage and Oracle experts on how to optimize your customers' Oracle environments. Register today to learn more!

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• BSOD in a Hyper-V Guest VM on install

  - by Greg Hurlman

  I've got Windows Server 2008 R2 running as a development environment, with Hyper-V hosting a few different VMs. I've created a new VM - 4GB of RAM, 2 virtual procs, legacy network adapter, removed the SCSI interface. I'm booting to an ISO image of the Windows Server 2008 R2 DVD, for OS install. The problem is, after the "Windows is loading files" screen, but before the Windows logo animation, I get a blue screen: BAD_SYSTEM_CONFIG_INFO yada yada yada *** STOP: 0x00000074 (etc, etc) I've used this same ISO several times to install to other VMs, no issue.

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• VM on Windows 7 Virtual PC cannot access host’s DVD Drive

  - by Gustavo Cavalcanti

  I have a brand new clean machine with Windows 7 Professional 64bit and I've installed the patch that adds Windows Virtual PC (Windows6.1-KB958559-x64). I then go to Windows Virtual PC, create a new Virtual Machine. As soon as go to settings and try to map the VM DVD drive to the host's DVD drive I get "File may be in use by another process or you may not have sufficient access privilege". I am an administrator in that box... What am I missing?

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• New VM on Windows 7 Virtual PC cannot access host's DVD Drive

  - by Gustavo Cavalcanti

  I have a brand new clean machine with Windows 7 Professional 64bit and I've installed the patch that adds Windows Virtual PC (Windows6.1-KB958559-x64). I then go to Windows Virtual PC, create a new Virtual Machine. As soon as go to settings and try to map the VM DVD drive to the host's DVD drive I get "File may be in use by another process or you may not have sufficient access privilege". I am an administrator in that box... Help please!

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• 32bit vs 64bit guest VM and RAM usage

  - by sims

  Why does a 32bit domU (Xen guest VM) use less RAM than a 64bit? Notes: The same software complied for a different arch(AMD64 vs. 686). Obviously this is Linux or BSD or something easily ported. Maybe this is also a good one for SO. I've read this is so. I can guess why, but I'd like to hear everyone's comments.

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• How to auto start VM on Ubuntu and Vmware workstation 7

  - by Mirage

  Initially i was using window server 2008 and vmware worktation 7. There i had .bat file and i put at startup folder to start Vms at startup. I have chnaged my OS to ubuntu . how can i auto start VM in there

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• Network transfer from host to VM very slow - VMWare Server & Windows 2003 Server

  - by barfoon

  Hey everyone, Im trying to transfer a file from a Windows 7 host running VMWare Server to a Windows 2003 server VM, and it's painfully slow. I've tried adding/adjusting registry keys and settings found on KB articles, and still nothing. Ive tried this: http://support.microsoft.com/kb/898468 http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=1619 Vmware tools are installed. Any ideas? Thanks,

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• VM Snapshot with pass-through disk?

  - by Silvio Daliana

  Hi I have 2008r2 with Hyper-V and one VM with a Pass-Through disk naturally i can't take snapshot (limitation of hyper-v) but can i use a scrip for unmount disk, take snapshot and remount disk? can you help me? Is this metod works? Some another ideas?

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• Can't make VM off Windows XP

  - by WebDevHobo

  I've got a copy of WinXP off of MSDNAA, with a key. I've mounted it to my CD-drive, and now I'm trying to make it in to a VM. The problem is, it seems that the thing is constantly trying to connect to a DHCP server, fails to connect and then decides no operating system was found. The file I got off MSDNAA was an .img file, so I had to mount it to a virtual CD drive. VmWare workstation comes with a Windows XP iso, tried that, also failed.

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