IBM Storwize V5020 User Manual (English)

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Chapter 3. Graphical user interface overview 109

HyperSwap 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. HyperSwap volumes are supported on Storwize systems

(for example, Storwize V5030 or Storwize V5030F systems) that

contain more than one I/O group.

Custom Custom volumes create volumes that are based on user-defined

customiztion rather than taking the standard default settings for each

of the options under quick volume creation.

Thin-provisioned When you create a volume, you can designate it as thin-provisioned. A

thin-provisioned volume has a virtual capacity and a real capacity.

Virtual capacity is the volume storage capacity that is available to a

host.

Real capacity is the storage capacity that is allocated to a

volume copy from a storage pool.

In a fully allocated volume, the virtual capacity and real capacity are

the same. In a thin-provisioned volume, the virtual capacity can be

much larger than the real capacity.

Compressed This volume is a special type of volume where data is compressed and

thin-provisioned at the same time. Any compressed volume is a

thin-provisioned volume by default, and no option is available to

change this characteristic. Data within the compressed volume is

compressed as it is written to disk. This design saves additional space

on the storage drive so that you can store more data within the same

storage system.

Change volumes Change volumes are used in Global Mirror relationships where cycling

mode is set to Multiple. Change volumes can also be used between

HyperSwap volume copies, and other relationship types, to

automatically maintain a consistent image of a secondary volume

when a relationship is being re synchronized.

Change volumes create periodic point-in-time-copies of the source

volumes and replicate them to the secondary site. Using change

volumes lowers bandwidth requirements by only addressing the

average throughput and not the peak.

To keep a volume accessible even when an MDisk on which it depends is unavailable, a

mirrored copy can be added to a selected volume. Any volume (generic, thin-provisioned or

compressed) can be mirrored with a mirror from any type, even the same one. Therefore, a

volume can be either thin-provisioned with compressed copy or compressed with

compressed copy. Each volume can have a maximum of two copies.

Each volume copy is created from a set of extents in a storage pool. By using volume

mirroring, a volume can have two physical copies. Each volume copy can belong to a different

storage 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.

Important: Compression is only available in the IBM Storwize V5030. It requires 64 GB of

RAM. To use the compression function, you must obtain the IBM Real-time Compression

license.

Other manuals for IBM Storwize V5020

Quick Installation Guide204 pages

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IBM Storwize V5020 Specifications

General

Model	Storwize V5020
Category	Storage
Maximum Number of Drives	240
Form Factor	2U
Supported Protocols	iSCSI
Drive Types Supported	SSD, SAS, NL-SAS
Expansion Units	Up to 9
RAID Levels Supported	0, 1, 5, 6, 10
Host Interface	16 Gb FC, 10 Gb iSCSI
Interface Types	Fibre Channel, Ethernet, SAS
Power Supply	Dual redundant power supplies