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  • Pseudorandom Number Generation with Specific Non-Uniform Distributions

    - by carnun
    Hello all, I'm writing a program that simulates various random walks (with differing distributions). At each timestep, I need randomly generated, two dimensional step distances and angles from the distribution of the random walk. I'm hoping someone can check my understanding of how to generate these random numbers. As I understand it I can use Inverse Transform Sampling as follows: If f(x) is the pdf of our random walk that has a non-uniform distribution, and y is a random number from a uniform distribution. Then if we let f(x) = y and solve to find x then we have a random number from the non-uniform distribution. Is this a feasible solution?

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  • You may be tempted by IaaS, but you should PaaS on that or your database cloud journey will be a short one

    - by B R Clouse
    Before we examine Consolidation, the next step in the journey to cloud, let's take a short detour to address a critical choice you will face at the outset of your journey: whether to deploy your databases in virtual machines or not. A common misconception we've encountered is the belief that moving to cloud computing can be accomplished by simply hosting one's current operating environment as-is within virtual machines, and then stacking those VMs together in a consolidated environment.  This solution is often described as "Infrastructure as a Service" (IaaS) because the building block for deployments is a VM, which behaves like a full complement of infrastructure.  This approach is easy to understand and may feel like a good first step, but it won't take your databases very far in the journey to cloud computing.  In fact, if you follow the IaaS fork in the road, your journey will end quickly, without realizing the full benefits of cloud computing.  The better option to is to rationalize the deployment stack so that VMs are needed only for exceptional cases.  By settling on a standard operating system and patch level, you create an infrastructure that potentially all of your databases can share.  Now, the building block will be database instances or possibly schemas within databases.  These components are the platforms on which you will deploy workloads, hence this is known as "Platform as a Service" (PaaS). PaaS opens the door to higher degrees of consolidation than IaaS, because with PaaS you will not need to accommodate the footprint (operating system, hypervisor, processes, ...) that each VM brings with it.  You will also reduce your maintenance overheard if you move forward without the VMs and their O/Ses to patch and monitor.  So while IaaS simply shuffles complex and varied environments into VMs,  PaaS actually reduces complexity by rationalizing to the small possible set of components.  Now we're ready to look at the consolidation options that PaaS provides -- in our next blog posting.

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  • Why Virtual Box won't give me option to create 64 bits guests?

    - by Eduardo Born
    My host is x64 bits Windows 8.1. I downloaded the latest Virtual Box (4.3) and I'm trying to create a VM with a 64 bits Ubuntu OS (ubuntu-12.04.3-desktop-amd64). When I go to New VM wizard, it doesn't give me option to select "Ubuntu (x64)" as I have seen in other people's screenshots, only just "Ubuntu". As a result, the ISO can't boot. I tried in another PC and Virtual Box gives the x64 variants to most listed OS... Control Panel shows x64 OS, x64 processor. My host laptop is a Sony Vaio VPCZ22UGX/N, Intel® Core™ i7-2640M processor. CPUz shows Vx-t is available on my processor, of course. Here is what I tried so far: I enabled IO APIC as required in the docs. I have virtualization enabled in the BIOS. It works fine in VMware. Check that Hyper-V is not running or even installed on my Windows. Same for VMware. I also tried running the command: VBoxManage modifyvm [vmname] --longmode on for that VM, but no change.. I think the issue is really that I can't select x64 variant of the Ubuntu OS for that VM. Other people seem to indicate that's a requirement, but I don't get that option for some reason. I spent a lot of time and can't find what's wrong... Anyone knows what could be missing here? Thank you very much!! Eduardo

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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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  • need help speeding up tag cloud filter for IE

    - by rod
    Hi All, Any ideas on how to speed this up in IE (performs decent in Firefox, but almost unusable in IE). Basically, it's a tag cloud with a filter text box to filter the cloud. <html> <head> <script type="text/javascript" src="jquery-1.3.2.min.js"></script> <script type="text/javascript"> $(document).ready(function(){ $('#tagFilter').keyup(function(e) { if (e.keyCode==8) { $('#cloudDiv > span').show(); } $('#cloudDiv > span').not('span:contains(' + $(this).val() + ')').hide(); }); }); </script> </head> <body> <input type="text" id="tagFilter" /> <div id="cloudDiv" style="height: 200px; width: 400px; overflow: auto;"> <script type="text/javascript"> for (i=0;i<=1300;i++) { document.write('<span><a href="#">Test ' + i + '</a>&nbsp;</span>'); } </script> </div> </body> </html> thanks, rodchar

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  • Sun Java Realtime System on VirtualMachine / cloud

    - by portoalet
    Just wondering if anybody can run/compile application for Sun Java Realtime system on a VM such as VMWare or on the Cloud such as on Amazon EC2 ? I know it is not ideal running Realtime java on a virtualized infrastructure, but it makes things easier. (Otherwise I just have to install SLES SP2 on physical hardware.)

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  • Migration of virtual machines

    - by Friedrich
    Are there tools for migrating from one virtual machine type to another? E.g let's say I have some Xen virtual machine and like to make it run under KVM. I know that qeumu has tools which can be used to "migrate" such machines, but how about: Xen - Kvm Kvm - Xen Xen - VMware (server?)

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  • Migration of virtual Maschines

    - by Friedrich
    I wonder if there are tools for migrating from one virtual machine type to another. E.g let's say I have some Xen virtual maschine and like to make it run under KVM. I know that e.g in qeumu are tools which can be used to "migrate" such machines but how about e.g Xen - Kvm Kvm - Xen Xen - Vmware (server?)

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  • Make VM Machine Name Visible to Host

    - by Agnel Kurian
    I have Ubuntu running in VMware Player. I am able to access an Apache instance on this VM by using the IP address but not by machine name. How do I make the name of the VM visible to the host? Edit: How do I add the machine name to my DNS? I am running within a Windows network.

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  • error: The specified device is claimed by another driver (uvcvideo) on the host operating system

    - by kamal
    I am trying to run an ubuntu 11, in VMplayer 5 on an ubuntu 12.04 host, and when trying to run the guest, i get this error, and no display. The specified device is claimed by another driver (uvcvideo) on the host operating system. The device might be in use. To Continue, the device will first be disconnected from its current driver. I also found a sort of related comment ( RESOLVED ) on similar issue on: ubuntu forums

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  • AWS Cloud Formation.Requires capabilities : [CAPABILITY_IAM] (Child Stack)

    - by Drew Khoury
    I'm running a CloudFormation template in the AWS Console. Running Stack Directly I started with a template that used IAM resources, and the console prompts me to acknowledge IAM capabilities when running the stack directly. Running Stack as a child I then tried to call the same stack from a parent stack and did not receive the same prompt. The stack then failed with the message: Requires capabilities : [CAPABILITY_IAM] Research The docs indicate that I can run CF scripts in a number of ways. There's plenty of docs around CLI/API and supplying the capability parameter, but there appears to be no information about how to make sure it's applied when running through the console. http://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/using-iam-template.html IAM Resources in AWS CloudFormation Templates CF Console CLI API What I've done / What I think I've raised an issue via the forum for now, but no response (yet): https://forums.aws.amazon.com/thread.jspa?threadID=139160 I suspect this is a bug in the Console, as there doesn't appear to be any documentation of how to change the behaviour via the console and as far as I'm aware this should just work. Anyone came across the same problem, or can report that it's working fine for them?

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  • PERC H710 mini raid controller advanced settings (BIOS)

    - by gregg
    I upgraded from a PERC h310 to an H710 controller on my Dell R620 but didnt get any increase in performance. This is a ESXi host with a 5 disk RAID 5. I noticed when going to the RAID BIOS that the advanced settings section was not activated/checked off. In that section is the strip element size: 64kb (default) read policy: no read ahead and the write policy: write-through. Will checking that section do any harm to the existing raid array or will it simply enable those policies and hopefully boost performance? Or, lastly, is it already using those policies and the checkmark is simply to activate them for changes

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  • Using Cloud Formation provisioned security group with specific subnet

    - by Fred Clausen
    Summary I'm attempting to create an AWS CloudFormation template which contains an instance for which I want to select a particular subnet. If I specify the subnet ID then I get the following error The parameter groupName cannot be used with the parameter subnet. From reading this thread it appears I need to provide security group IDs - not names. How can I create a security group in CloudFormation and then get its ID after the fact? Details The relevant part of the instance config is as follows "WebServerHost": { "Type" : "AWS::EC2::Instance", <..skipping metadata...> "Properties": { "ImageId" : { "ami-1234" }, "InstanceType" : { "Ref" : "WebServerInstanceType" }, "SecurityGroups" : [ {"Ref" : "WebServerSecurityGroup"} ], "SubnetId" : "subnet-abcdef123", and the security group looks as follows "WebServerSecurityGroup" : { "Type" : "AWS::EC2::SecurityGroup", "Properties" : { "GroupDescription" : "Enable HTTP and SSH", "SecurityGroupIngress" : [ {"IpProtocol" : "tcp", "FromPort" : "80", "ToPort" : "80", "CidrIp" : "0.0.0.0/0"}, {"IpProtocol" : "tcp", "FromPort" : "22", "ToPort" : "22", "CidrIp" : "0.0.0.0/0"} ] } }, How can I create and then get that security group's ID?

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  • ESXi hard drive power saving

    - by Jens
    I currently have a Windows Server running beneath my desk and was considering replacing it with a ESXi layer to run both a Windows and Unix virtual machine. The ESXi is going to give me some nice advantages that I can use but I am still stuck on this issue: The server is mainly used as a fileserver/local webserver, and I use Windows tasks to hibernate/wake the machine at night. Also there is an aggressive disk spin down timeout to reduce noise. With ESXi, this will not be possible to do any more. I could live with the server running 24/7, but I would really like to spin down the disks when not in use. Is there a way to do this on ESXi?

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  • ESXi 4.1 host not recognising existing VMFS datastore

    - by Graeme Donaldson
    Existing setup: host1 and host2, ESX 4.0, 2 HBAs each. lun1 and lun2, 2 LUNs belonging to the same RAID set (my terminology might be sketchy here). This has been working just fine all along. I added host3, ESXi 4.1, 2 HBAs. If I view Configuration / Storage Adapters, I can see that both HBAs see both LUNs, but if I view Configuration / Storage, I only see 1 datastore. host1/2 can see both LUNs and I have VMs running on both too. I have rescanned, refreshed and even rebooted, but host3 refuses to acknowledge 1 of the datastores. Does anyone know what's going on? Update: I re-installed the host with ESX (not i) 4.0, same version as the existing hosts and it's still not recognising the vmfs. I think I'm going to SVmotion everything off that datastore then format it. Update2: I've created the LUN from scratch and the problem gets even weirder. I've presented the LUN to all 3 hosts, and I can see the LUN in the vSphere client's Configuration / Storage Adapters section on all 3 hosts. If I create a datastore on the LUN via the Configuration / Storage section on host1, it works fine and I can create an empty folder via datastore browser, but the datastore is not seen by the host2 and host3. I can use the Add Storage wizard on host2 and it will see the LUN. At this point the "VMFS Label" column has the label I gave with "(head)" appended. If I try the Add Storage wizard's "Keep the existing signature" option, it fails with an error "Cannot change the host configuration." and a dialog box that says 'Call "HostStorageSystem.ResolveMultipleUnresolvedVmfsVolumes" for object "storageSystem-17" on vCenter Server "vcenter.company.local" failed.' If I try the Add Storage wizard's "Assign a new signature" option on host2, it will complete and the VMFS label will have "snap-(hexnumber)-" prepended. At this point its also visible on host3, but not host1. I have a similar setup in a different datacenter which didn't give me all this trouble.

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  • ESXI 4 IPMI 2.0 - Cannot connect to IPMI after boot past bios

    - by adamflavell
    Dear All, I would appreciate any help here. I have a Supermicro 6016T-NTRF running ESXI 4 fine. The health monitors are showing up so ESXI is picking up the IPMI status. But I cannot connect to the host remotely via the dedicated IPMI nic. When the machine is in bios section I CAN connect but as soon as ESXI starts to boot I get blocked. Supermicro say the issue must be that ESXI is blocking the IPMI ports. How can this be corrected? I have read that there is no firewall on ESXI 4. Thanks, Adam

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  • Connecting Dell PowerVault NAS to ESXi

    - by Matt Fitz
    Just got a Dell PowerVault NAS storage device running Windows Storage Server Standard which includes NFS. When I try and connect the ESXi server I get the following message: Call "HostDatastoreSystem.CreateNasDatastore" for object "ha-datastoresystem" on ESXi "powerhouse" failed. Operation failed, diagnostics report: Unable to complete Sysinfo operation. Please see the VMkernel log file for more details. I am pretty sure it is a username/password type thing. Not sure were to begin though. Also, I am planning on using "Username Mapping" instead of Active Directory. Any ideas would be greatly appreciated

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  • ESXi and Windows Server CPU parking

    - by Chris J
    For those that don't know, CPU parking is a feature in recent Windows Server releases that allows Windows to pretty much drop a CPU core to zero use, and having nothing use it. It's been introduced as a power-saving measure. There's more detail about it here, amongst other places. However what I'm curious about is whether this matter on a virtualised guest - or is CPU parking more of a hindrance than a help, given that the physical CPUs are managed by ESXi, not Windows, and that a parked CPU is less likely to deal with traffic unless the scheduler deems there's enough work to unpark the CPU? I've not found anything about this - I do suspect it will be very much based on a given workload, but I've not seen any discussion (unlike, say, whether hyper-threading has any effect, which seems to be discussed regularly). Whilst I do understand the "test with your workload" I was wondering if there was any advice/guidelines out there that I've missed.

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  • conversion of a VMDK image with qemu-img failed with "error while reading sector 131072: Invalid argument"

    - by Erik Sjölund
    I tried to convert a VMDK image found in a OVA file to the QCOW2 format with the qemu-img command but it failed with the error message qemu-img: error while reading sector 131072: Invalid argument user@ubuntu:/tmp$ wget ftp://ftp.sanger.ac.uk/pub/databases/Pfam/vm/PfamWeb_20120124.ova user@ubuntu:/tmp$ tar xfv PfamWeb_20120124.ova PfamWeb_20120124_2.ovf PfamWeb_20120124_2.mf PfamWeb_20120124_2-disk1.vmdk user@ubuntu:/tmp$ qemu-img convert -O qcow2 PfamWeb_20120124_2-disk1.vmdk PfamWeb_20120124_2.qcow2 qemu-img: error while reading sector 131072: Invalid argument user@ubuntu:/tmp$ qemu-img --version | grep "qemu-img version" qemu-img version 1.0, Copyright (c) 2004-2008 Fabrice Bellard user@ubuntu:/tmp$ dpkg-query -f='${Version}\n' --show qemu-utils 1.0+noroms-0ubuntu14.1 user@ubuntu:/tmp$ cat /etc/issue Ubuntu 12.04.1 LTS \n \l How do I avoid the error?

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  • Problems with 2 ISCSI connections esxi 3.5

    - by rphilli5
    I am running a dell poweredge 1950 with 4 nic cards. 1 is bonded to SAN #1 on 192.168.90.xx. The second SAN is on a separate network - 192.168.7.xx The network adapter can view the ip range of the san and the NIC can be pinged from 192.168.7.xx range. vswitch1 and vswitch2 are configured identically except for the ip address. The second SAN has been added to the iscsi software adapter but the SAN is never recognized. I can connect to the SAN from other machines on the local network. Is there something else that needs to be configured for the iscsi software adapter to know which vswitch to use?

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  • Issues with doing a P2V on Exchange 2007

    - by PokermUNKEE
    I shutdown all Exchange services on the physical box and did a convert. Everything converted fine. Server booted up no issues and I could receive email from the outside world with no issues. But I am unable to send emails internally or externally. They just sit in the Outbox. I also disabled the DHCPClient service as I didn't want the server to get an IP address from DHCP when it first came online. It came online with no IP, then I used console to assign the correct static IP address (same one on the physical server) and rebooted. I ran the Exchange Troubleshooting Agent and it gave me the following errors: The value for the '\MSExchangeIS Mailbox\Messages Queued For Submission' counter on server exchange is greater than zero (average value is 8.8) and it appears that 'MSExchangeMailSubmission' is failing to submit messages to at least one computer with the Hub Transport server role installed over the last minute. Found 1 computers with the Hub Transport server role installed in the same Active Directory site as server exchange using local Active Directory site GUID 'ce8a4367-1bf6-4825-9cac-c4e2b115c450'. Check Local Active Directory Site Hub Transport Server Role Health (Mailflow_CheckLocalBhHealth1.1.1.1.1.1.1.1) I have one Exchange server with all the roles on it. Has anyone see this before when doing a convert? Please help :(

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  • All paths down on vSphere esxi 5.1, LSI 9211-8i

    - by user1434058
    Works 100% ESXi 5.1 HBA (LSI 1064e) 1x SAS2 100GB SSD Doesn't work ESXi 5.1 HBA (LSI 9211-8i IT /IBM M1015) 1x SAS2 100GB SSD After a few hours of heavy HD load i get: - Device or filesystem with identifier ['all drives'] has entered the All Paths Down state. - ESXi retries but loses connectivity to the SAS drive, marks it as "dead or error" - reboot fixes the issue How can i fix this issue?

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  • kickstart: reference floppy drive via %ksappend or %include

    - by virtualeyes
    Having trouble getting %ksappend or %include to work when referencing a local floppy drive. Booting off remote server's cd-rom drive I am able to load the CentOS 6 minimal install image, and then add ks=hd:fd0/ks-jvm.cfg to boot params to load kickstart init file from floppy disk. That works fine. The problem is that I want to load a streamlined generic init file off the floppy and then, within the init, %ksappend or %include specific config files relative to the type of server I'm building (JVM, MySQL, Apache, etc.) I do not have DHCP, networking needs to be specified statically, so %ksappend and %include both fail when attempting to reference http://some-LAN-IP/foo.cfg since networking has not yet been set. The kickstart setup only works when I glob in the entire config into a single file, which is great, but ugly and difficult to maintain when I return later, having forgotten the original setup. At this point I'd be happy if I could get %ksappend or %include working with a floppy drive reference in the %post section; that would consolidate a lot of common boilerplate that all kickstarts will rely on (sshd_config, rsync config, resolve.conf, and so on) Thanks for providing the magic floppy drive reference that is eluding me!

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