298 Implementing the IBM Storwize V5000 Gen2 with IBM Spectrum Virtualize V8.1
6.1.7 Volumes for various topologies
A Basic volume is the simplest form of volume. It consists of a single volume copy, made up of
extents
striped across all MDisks in a storage pool. It services I/O by using readwrite cache
and is classified as
fully allocated (reported real capacity and virtual capacity are equal). You
can create other forms of volumes, depending on the type of topology that is configured on
your system:
With
standard topology, which is a single-site configuration, you can create a basic volume
or a
mirrored volume.
By using volume mirroring, a volume can have two physical copies. Each volume copy can
belong to a different pool, and each copy has the same virtual capacity as the volume. In
the management GUI, an asterisk indicates the primary copy of the mirrored volume. The
primary copy indicates the preferred volume for read requests.
With
HyperSwap topology, which is a three-site HA configuration, you can create a basic
volume or a HyperSwap volume.
HyperSwap volumes create copies on separate sites for systems that are configured with
HyperSwap topology. Data that is written to a HyperSwap volume is automatically sent to
both copies so that either site can provide access to the volume if the other site becomes
unavailable.
Virtual Volumes (VVols): The IBM Spectrum Virtualize V7.6.0 release also introduces
Virtual Volumes. These volumes are available in a system configuration that supports
VMware vSphere Virtual Volumes. These volumes allow VMware vCenter to manage
system objects, such as volumes and pools. The Spectrum Virtualize system
administrators can create volume objects of this class, and assign ownership to VMware
administrators to simplify management.
For more information about configuring vVol with IBM Spectrum Virtualize, see Configuring
VMware Virtual Volumes for Systems Powered by IBM Spectrum Virtualize, SG24-8328.
Note: For IBM Storwize V5000 Gen2, the HyperSwap topology is supported only on
Storwize V5030 and Storwize V5030F systems.
Note: From V7.4.0 onwards, it is possible to prevent accidental deletion of volumes, if they
have recently performed any I/O operations. This feature is called
Volume protection, and it
prevents active volumes or host mappings from being deleted inadvertently. This is done
by using a global system setting. For more information, see IBM Knowledge Center:
https://ibm.biz/BdjSLu
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