6 Implementing the IBM Storwize V7000 with IBM Spectrum Virtualize V8.2.1
With IBM Spectrum Virtualize, free space does not need to be maintained and managed in 
each storage subsystem, which further increases capacity usage. Today, it is typical that open 
systems run at less than 50% of the usable capacity that is provided by the RAID disk 
subsystems. 
The use of the installed raw capacity in the disk subsystems shows usage numbers of less 
than 35%, depending on the RAID level that is used. A block-level virtualization solution, such 
as IBM Spectrum Virtualize, can allow a significant increase to approximately 75 - 80%.
1.3  Latest changes and enhancements
IBM Spectrum Virtualize V8.2.1 is another step in the product line development that brings 
new features and enhancements. The major software changes in subsequent code releases 
are described in this section.
V8.2.1 of the Spectrum Virtualize code brought the following changes:
/SM590000Full IP-based quorum: Support for administrators looking to consolidate their infrastructure 
over Ethernet.
/SM590000Support for iSCSI extensions over RDMA (iSER) host attach enhancements.
/SM590000Support for host login information for Ethernet-attached hosts.
/SM59000064 K host mappings: Increased from the previous limitation of 20 K.
/SM590000IBM Spectrum Insights: Provides a call home protocol that uses IBM IP to deliver a more 
robust path and higher bandwidth and higher frequency data transmission, with 
end-to-end confirmation of receipt.
/SM590000Improvements to call home with email notifications.
/SM590000Added support for SafeNet KeySecure encryption key server.
/SM590000Single copy VDisk expand with format: Enables administrators to expand a VDisk without 
migrating the data off and back on.
/SM590000Support for RDMA-based connections between nodes. This feature requires 25 GbE 
adapters to be installed on the nodes. Expands the host connectivity options for those 
storage arrays not initially covered by 8.2.
/SM590000NVMe over Fibre Channel support on 16 Gb Fibre Channel adapters: Extends the 
simplicity, efficiency, and end-to-end NVMe model where NVMe commands and structures 
are transferred end to end, requiring no translations