Open System Services Management and Operations Guide (G06.29+, H06.07+)

Managing Filesets
Open System Services Management and Operations Guide—527191-005
5-16
Changing the Operating Parameters of a Fileset
attribute settings are, from highest to lowest fault tolerance and from lowest to highest
performance:
UNBUFFEREDCP
DP2BUFFEREDCP
OSSBUFFEREDCP
DP2BUFFERED
OSSBUFFERED
The behaviors associated with these levels of fault tolerance are shown in Table 5-1.
Table 5-1. Effects of File I/O Fault-Tolerance Attribute Settings (page1of2)
Setting Scenarios Results
UNBUFFEREDCP Single DP2 processor failure
System failure (or double DP2
processor failure)
Application processor failure
Transparent recovery
Application fails with possible
loss of a single write request if
failure occurs during the write
request
Application fails with possible
loss of a single write request if
failure occurs during the write
request
DP2BUFFEREDCP Single DP2 processor failure
System failure (or double DP2
processor failure)
Application processor failure
Transparent recovery
Application fails with possible
loss of multiple buffered write
requests if failure occurs before
buffered data is written to disk
Application fails with possible
loss of a single write request if
failure occurs during the write
request
OSSBUFFEREDCP Single DP2 processor failure
System failure (or double DP2
processor failure)
Application processor failure
Transparent recovery
Application fails with possible
loss of multiple buffered write
requests if failure occurs before
buffered data is written to disk
Application fails with possible
loss of multiple buffered write
requests if failure occurs before
buffered data is written to disk