This application allows you to extract data from different sections of the Facebook platform for research purposes. It creates network files in the gdf format (a simple text format that specifies a graph) as well as statistical files using a tab-separated format.
These files can then be analyzed and visualized using graph visualization software such as the powerful and very easy to use gephi platform or statistical tools such the interactive visualization software Mondrian.
Big networks may take some time to process. Be patient!
Here is the link to go to: https://apps.facebook.com/netvizz/
From: Microsoft Virtualization Secrets by John Savill
Hyper-V Replica is a NEW feature in windows Server 2012 that enables asynchronous replication of a virtual machine’s storage from one Hyper-V host to another Hyper-V host. After the seed replica is store, only delta (changes) are replicated periodically, every 5 minutes. In the event of a disaster, sys ads can activate the replicated virtual machine.
Configuring Replication is done via the “Replication Configuration ” setting where you can select the transport protocol to use. either over port 80 (http) or 443 (https). Then you enable individual machines to have a replica through the “Enable Replication” action, which starts up the enable replication wizard.
1. Use PerfMon to analyse utilization. Task Manager doesnt show the CPU usage of each VMs. Use PerfMon from the Admin Tools then select “Reliability and Peformance Monitor”. Then add logical counters to monitor: a. Hyper-V hypervisor Virtual Processor , % Total Run time b. Hyper-V Hypervisor Root Virtual Process , % Total run time c. Physical Disk, % Disk Read Time d. Physical Disk, % Disk Write Time e. Physical Disk, % Idle Time f. Physical Disk, Avg Disk Read Queue Length g. Physical Disk, Avg Disk Write Queue Length
Make sure your VM is already running, otherwise, the counters wont appear.
2. Networking Enhancements The R2 release of HyperV supports new features: a. Jumbo Frame Support b. Virtual Mahcine Queue support c. NIC Teaming
3. Dedicate One physical network for host management
4. Run Hyper-V on Windows Server 2008 core. More secure and possible more stable with a smaller attack surface and slightly les overhead for the parent partition.
5. Set AntiVirus to IGNORE virtualization related files. (.vhd, .bin, .vsv and .iso)
6. Install the Integration Services.
Source: Insider’s Guide to Hyper-V by John Kelbley and Mike Sterling
There are three known types of virtual hard disk in HyperV: Fixed, Dynamic and Differencing.
Fixed Disk are used in production setups. As the name suggest, the amount of disk space you set is the amount of disk space that hyperv will allocate right away.
Dynamic disks starts off small but will expand to the maximum size specified in the setup. If you run out of space as the dynamic disk is expanding, the Virtual machine will pause. Useful for test bed scenarios and not in production environmnents as this will slow the I/O of the server.
Differencing Disks is a disk that stores the changes to a parent disk. If you want to setup multiple versions from a single parent, the use of differencing disk provides the smallest disk footprint. Ideal only for testbed scenarios.
