Issue No. 66January 2018

20 Server Virtualization Terms

Many of you have heard the term “virtualization”.  These are some good terms to know related to server virtualization and VMware.
  1. VM: Virtual Machine.
  2. ESXi: The vSphere Hypervisor from VMware.
  3. vmkernel: Officially the “operating system” that runs ESXi and delivers storage networking for VMs. 
  4. VMFS: Virtual Machine File System for ESXi hosts, a clustered file system for running VMs.
  5. iSCSI: Ethernet-based shared storage protocol.
  6. SAS: Drive type for local disks (also SATA).
  7. FCoE: Fibre Channel over Ethernet, a networking and storage technology.
  8. HBA: Host Bus Adapter for Fibre Channel storage networks.
  9. IOPs: Input/Outputs per second, detailed measurement of a drive’s performance.
  10. VM Snapshot: A point-in-time representation of a VM.
  11. ALUA: Asymmetrical logical unit access, a storage array feature. 
  12. NUMA: Non-uniform memory access, when multiple processors are involved their memory access is relative to their location.
  13. Virtual NUMA: Virtualizes NUMA with VMware hardware version 8 VMs.
  14. LUN: Logical unit number, identifies shared storage (Fibre Channel/iSCSI).
  15. pRDM: Physical mode raw device mapping, presents a LUN directly to a VM.
  16. vRDM: Virtual mode raw device mapping, encapsulates a path to a LUN specifically for one VM in a VMDK.
  17. SAN: Storage area network, a shared storage technique for block protocols (Fibre Channel/iSCSI).
  18. NAS: Network attached storage, a shared storage technique for file protocols (NFS).
  19. NFS: Network file system, a file-based storage protocol.
  20. DAS: Direct attached storage, disk devices in a host directly.
If you have old physical server boxes that you are looking to virtualize, have general server virtualization questions on upcoming projects for our VMware Certified Engineers, or would like to talk to us about our VM server monthly management services, please feel free to reach out to us at:
Phone: 858-952-5400 x0