Articles & Content


Do Extent Numbers Really Matter Any More? (B07)

Topic: 2009 EU

Subtopic: DB2 for z/OS

DATE: 2009-10-6 (14:15 - 15:15)
SPEAKERS: Steve Thomas (BMC Software)

Over recent years there have been some huge advances in Disk Storage Technology. Despite this many DB2 sites I visit are still using rules of thumb related based more on 3380 and 3390 disks from the 1980's rather than on the modern RAID based arrays such as the IBM DS8300 series they are actually using. A typical example is the thorny question of how many extents an object needs to have before it requires Reorganizing. This presentation explains some of the more relevant technical advances in disk related technology and related changes to the z/OS Operating system. Topics covered include PAV, HyperPAV, MIDAW, and the new larger Disk Configurations that can be supported along with some of the Software based solutions that exploit these new capabilities such as Flashcopy and GDPS. The aim is to get the audience to review their thinking on all aspects of storage technology and to check whether any of it is now out of date.

EXP. LEVEL: Beginner,Intermediate


Learn how modern RAID Devices work from a logical viewpoint and how this is mapped onto older 3380 and 3390 Disk Architectures used by z/OS

Understand some recent developments in Disk Technology such as PAV, Hyper-PAV, Multiple Allegiance and Extended Addressability (EA) datasets

Explain associated Operating system changes that have helped get the most out of new Disks, including MIDAW, extent consolidation and increasing the maximum numbers of extents that can be used

Consider how advances in Disk technology might be used in other areas such as Backup and Recovery and Data Propagation

Be able to answer relevant questions such as Do Extent Numbers still Matter? and Should my Data be using some of the new larger Disks that are now available?

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