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1.2.3.2 Reporting Functions
The IXFP/SnapShot for VSE/ESA reporting functiion displays logical volume
utilization, such as space allocated and data stored on the volume. It can also
display a summary of the entire subsystem and its NCL, freespace, capacity
allocated and used, and the compression and compaction ratio.
For the capacity management functions supported by OS/390 and VM/ESA, such
as reconfiguring the DASD, adding or deleting volumes, and draining an array,
you use the RVA′s local operator panel.
1.3 What Is Peer-to-Peer Remote Copy?
We explain functions here on a level that is needed to understand how
peer-to-peer remote copy (PPRC) functions on an RVA. If you would like more
detailed descriptions of this data availability architecture, see the RVA redbook
entitled
Implementing PPRC on RVA
, SG24-4951.
PPRC allows the synchronous copying of data from a primary RVA to one or
more secondary RVAs at the same or a different location while providing
enterprisewide data protection, availability, and ease of system management.
The secondary site may be up to 43 km away from the primary. The
synchronous nature of PPRC offers a full recovery solution while delivering the
highest levels of data integrity and data availability for both operational and
disaster recovery environments.
The availability of PPRC on the RVA Model T82 now places the RVA at the heart
of mission-critical enterprise storage solutions—including remote site disaster
recovery protection, high availability, and data migration capabilities.
Chapter 1. The IBM RAMAC Virtual Array 5