Hitachi Unified Storage VM, Product Overview Manual

Page: 41 / 70

Software overview
3–5
Hitachi Unified Storage VM Product Overview Guide
Host Server software
The following tables describes the Host Server software that is available on
the Unified Storage VM storage system.
Table 3-7 Host Server-based Features and Functions
File module storage system software features and
functions
This section describes the Unified Storage VM storage system file module
software.
Intelligent tiering
Intelligent tiering allows customers to build scalable and flexible storage
solutions that offer cost-effective performance with simplified and
consolidated storage management. Using the various tiers of storage
available, customers can keep data on line longer without relying
exclusively on tape technologies, minimizing the impact of backup,
replication, or disaster-recovery requirements as the strategy requires.
Intelligent tiering gives data a longer disk lifecycle if desired, which can
improve data access times for hosts and users.
Data migrator
Data migrator is an embedded feature of the Hitachi File System. All file
system functions (snapshots, replication, quotas, etc.) work seamlessly as
if the data were still on the original storage tier. Data integrity is also
maintained during the migration or recall. But the data appears as if it has
not moved at all. Users and applications see the data as if it still exists in
the original location. The Hitachi File System contains the metadata that
indicates where the data actually resides.
Cross-volume links
Cross-volume links (CVL) and external cross-volume links (XVL) are
complementary technologies that extend the reach of data migrator. A
cross-volume link is a zero-length file on a source file system (the primary
file system) which "points" at a corresponding file on a target file system
(the secondary file system). The pointer is stored in the onode of the
Feature Description
Hitachi Command Control
Interface software On open-systems, performs various functions, including data replication
and data protection operations by issuing commands from the host to
the Hitachi Data Systems storage systems. The CCI software supports
scripting and provides failover and mutual hot standby functionality in
cooperation with host failover products.
Dataset Replication Operates with the ShadowImage feature. Rewrites the OS management
information (VTOC, VVDS, and VTOCIX) and dataset name and creates
a user catalog for a ShadowImage target volume after a split operation.
Provides the prepare, volume divide, volume unify, and volume backup
functions to enable use of a ShadowImage target volume.