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2 Software extensions
Only the main extensions and enhancements over the previous ver-
sion BS2000/OSD-BC V5.0 are described in the following sections.
2.1 Adaptations to CFCS 4.3
The progress reporting in CFCS 4.3 for different requirements has
been implemented in BS2000/OSD V6.0.
2.2 Enhancement of multiprocessor performance via
AS/RM lock breakup
A rise in the multiprocessor degree also increases the probabil-
ity of lock conflicts, which in turn reduces performance.
The memory management has been modified internally to replace the
AS/RM lock with several separate locks and CPU-specific memory
domains have been introduced for the RM lock.
Each memory domain behaves in the same way as the complete memory
of a system and is protected with a lock of its own.
This does not result in any changes to the external interfaces.
2.3 Data spaces
As of this version, data spaces are also supported for SX servers
to further decrease the load on the system address space. Among
others, data spaces are used by memory management, DAB and for
external storage of the F5 label.
*1 OSD/XC 2.0 and X2000 3.0A are required for supporting ESA data
*1 spaces in customer applications on SX servers.
*1 Data spaces are implemented for TU applications in CISCFW 4.4,
*1 that is supplied with X2000 3.0.
2.4 Performance enhancement of CCOPY in conjunction
with HSMS V7.0A and ARCHIVE V7.0B
The initialization phase in CCOPY V5.0 has been considerably re-
duced for backups using TimeFinder/BCV, to allow the applications
concerned to reopen their files faster. This minimizes the times
in which applications cannot work.
*2 Further performance improvements are achieved by optimizing
*2 catalog access; the File List is eliminated and the Wildcard
*2 Syntax resolution does not occur until the ARCHIVE.
*2 When Shared Pubsets are used, backups are always carried
*2 out locally, independent of the master-slave role.