Adabas Cluster Services

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Adabas Cluster Services

• Supporting IBMs Parallel Sysplex Architecture

Bruce Beaman Director, Product Marketing
Software AG USA, Inc.
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IBMs Parallel Sysplex Technology

• Uses current IBM CMOS technology
• Up to 32 OS/390 boxes coupled together - runs as
  one MVS image
• Coupling Facility (a big global bufferpool)
• Sysplex timer
• CICS, VTAM, WLMetc, etc.
• Benefits
• True 24 X 7 - Outage persistent (planned or
  unplanned)
• Data sharing across MVS images

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Adabas Parallel Sysplex Support

• Platform
• OS/390 Parallel Sysplex Environment
• Adabas Versions
• Version 6 Adaplex
• Version 7.2 Adabas Cluster Services
• Advantage
• Data Sharing Transactional Processing
• True 24 X 7

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The Coupling Facility

• Cache Structure
• Data consistency and high speed
• Organization of shared data
• Lock Structure
• Resource Serialization

Cache Structure
Lock Structure
Coupling Facility
WLM
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Features

• All nuclei may do updates
• No single point of failure
• Contention handled globally
• Contention handled via XES services
• Multiple nuclei permitted per system
• One or more nuclei may be run locally
• No command re-routing required

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Features

• Asynchronous process to merge PLOG
• Single dataset to do regenerate (by time seq.)
• Automatic process restart
• Interface with ARM (Automatic Restart Manager)
• Support for planned outages
• Interfaces with Coupling Facility Auto Rebuild

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Multi Update Support
OS/390
OS/390
SVC
SVC
XCF
XCF
Coupling Facility
Update Nucleus A
Update Nucleus B
ADALNC
ADALNC

CICS A
CICS B
Users
Users
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System Model
OS/390
OS/390
Coupling Facility
Update Nucleus A
Update Nucleus B
Read / Write
Read / Write
ASSO
DATA

PLOG
TEMP
TEMP
PLOG
WORK
WORK
PLOG merge
Asynchronous merge
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The Update Nucleus
OS/390
Local Buffer Pool
Read / Write
Read Only Nucleus
Vector
Buffer Pool Updated Blocks
User Locks
File Locks
ISN Hold Queue
Read
Write
Coupling Facility
ASSO
PLOG
DATA
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Coupling Facility

• All updated ASSO andDATA Blocks placed in CF
• Castout by Buffer Flush
• Assignment of userscontrolled by locks
• Contention of record updates controlled by locks.
• Exclusive access/update offiles controlled by
  locks

Coupling Facility
Updated ASSO Blocks
Updated DATA Blocks
Record Locks
File Locks
User Locks
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Log Merge Utility
OS/390
OS/390
Command Manager
Nucleus
Command Manager
Nucleus
Coupling Facility
PLOG
PLOG
ADARES
ASSO
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Adabas Cluster Services - Benefits

• ALS enables Adabas to run in a Parallel Sysplex
  environment exploiting its full functionality,
  true 24 X 7
• Parallel Sysplex is used increasingly at large
  sites requiring non-stop availability of their
  applications. There is high interest in the
  Software AG world-wide customer base.
• NO change to applications

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Thank you!