Guardian Procedure Calls Reference Manual (G06.25+)

System Limits
Guardian Procedure Calls Reference Manual—522629-013
J-8
Table J-6. DP2 Limits
Limit Description
Maximum
Value Comment
Volumes per physical disk 1 Can be mirrored.
Structured disk block size 4 KB
Unstructured disk file buffer
size
4 KB
Number of extents per file <= 978 Depends on number of partitions and
alternate keys specified.
Disk volume size 1 TB
Cache per volume 1 GB Cache is limited to the available
physical and virtual memory space in
the processor. Configuring a cache
to be too large can cause memory
pressure in the processor, which
results in increased processor
overhead in DP2 processes and can
result in longer execution times for
other applications. In extreme cases
of memory pressure, an %11500
processor halt can occur.
Bulk I/O transfer 56 KB bytes
Number of locks 5,000 per file
open and per
transaction
Lock limits can be raised by using
the SYSGEN modifiers
MAXLOCKSPEROCB and
MAXLOCKSPERTCB. Maximum
value for these limits is 100,000.
Refer to the
System Generation
Manual for Disk and Tape Devices.
Configuring large values for these
limits increases DP2 memory
requirements and can affect DP2
response time.