Greg Shields

Greg Shields is a partner and principal technologist with Concentrated Technology, an IT analysis and strategic consulting firm. Contact him at Greg Shields is a partner and principal technologist with Concentrated Technology, an IT analysis and strategic consulting firm. Contact him at

Articles by Greg Shields
Q: What is XDPing used for?
XDPing is a command-line tool used to check for common misconfiguration problems in a Citrix XenDesktop environment.
Q: How do I configure Citrix Web Interface 5.4 with XenDesktop 5.5 to deploy Citrix Receiver?
If Citrix XenDesktop's Web Interface doesn't install the Citrix Receiver client-side software, you'll need to make a change to Web Interface's webinterface.conf file.
Q: What's the difference between a Catalog and a Desktop Group in Citrix XenDesktop 5.5?
Citrix XenDesktop 5.5 aggregates Catalogs, Desktop Groups, and Active Directory (AD) security groups together to dictate which users get what virtual machines (VMs).
Q: When would I use Pooled-Random versus Pooled-Static machine types in Citrix XenDesktop 5.5?
Pooled virtual machines (VMs) is one way XenDesktop creates a Virtual Desktop Infrastructure (VDI). Use the Pooled-Random subtype to meet licensing requirements.
Q: What five virtual machine types does Citrix XenDesktop 5.5 support?
Cirtrix XenDesktop 5.5 supports five different VM types, in any combination, to create a Virtual Desktop Infrastructure (VDI).
Q: After what events will a vSphere Storage DRS imbalance calculation be automatically invoked?
VMware vSphere 5's Storage DRS load balancing runs by default every eight hours and is also triggered by these events.
Q: How often is vSphere Storage DRS's imbalance calculation invoked?
By default, the I/O load-balancing algorithm used by Storage DRS is invoked every eight hours; VMware recommends against changing this default.
Q: Why are affinity rules important in vSphere Storage DRS?
Affinity rules in Storage DRS ensure VM disk files with special use cases either stay together or are always separate.
Q: Can upgrading VMFS datastores from VMFS-3 to VMFS-5 create problems?
Because of differences in partition block sizes between vSphere 4 and vSphere 5, VMware recommends creating new volumes rather than upgrading existing ones.
Q: What latency thresholds make good starting points for invoking VMware Storage DRS?
VMware Storage DRS can help load balance VM disk files; for best performance, use these guidelines for setting the I/O latency threshold.
Q: What kinds of load balancing does VMware Storage DRS support?
VMware vSphere 5's Storage DRS is designed to assist in two high-level load balancing use cases.
Q: How can VMware Player be useful for employee VPN connections?
You can use VMware Player to create a template VM that will automate VPN connections for your end users.
Q: Can you use VMware Player to resolve application incompatibility problems in Windows 7?
VMware Player's Unity feature can provide legacy applications through a VM to Windows 7.
Q: Are VMware's vSphere HA and Storage DRS supported in a mixed-version cluster?
You should ensure that all hosts in a VMware vSphere cluster are upgraded before enabling new features and functionality such as vSphere HA or Storage DRS.
Q: Where have Teams gone in VMware Workstation 8?
VMware Workstation 8 doesn't include the Teams feature but you can get shared startup and shutdown settings as well as LAN segments by grouping VMs in folders.
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