October 2006
Intermediate to advanced
160 pages
4h 9m
English
book
DB2 for z/OS: Data Sharing in a Nutshell
by Paolo Bruni, Mark Anders, KyengDong Park, Mark Rader, Judy Ruby-Brown
Content preview from DB2 for z/OS: Data Sharing in a Nutshell
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Chapter 3. The coupling facility 55
3.3.2 System-managed duplexing
System-managed duplexing was introduced by OS/390 V2R8 and implemented
by DB2 for the SCA and lock structures in DB2 V7 in 2001.
System-managed duplexing provides a second copy of the structure that is an
exact copy of the primary structure. When a CF fails, fallback occurs to simplex
within seconds, avoiding an outage.
The following requirements, which are external to the normal concerns of the
DB2 staff, are necessary for duplexing:
Provide CF to CF links that allow communication and synchronization to
occur between the CFs involved.
Ensure that there is sufficient host capacity ...
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