"ERROR: An I/O error has occurred on file <library>.<instrument-type-data>.DATA." occurs when creating a portfolio file


In SAS® Risk Dimensions®, you might encounter error messages like the following when you attempt to create a portfolio file:

ERROR: An I/O error has occurred on file <library>.<instrument-type-data>.DATA. ERROR: UNIX errno = 24. ERROR: An I/O error has occurred on file <library>.<instrument-type-data>.DATA. ERROR: UNIX errno = 24. ERROR: An I/O error has occurred on file <library>.<instrument-type-data>.DATA. ERROR: UNIX errno = 24. ...

These errors are known to occur when the number of data sets that the SAS system has open exceeds the number of files that the operating system allows to be open simultaneously for the user. SAS Risk Dimensions 5.5 and later releases store portfolio data in separate data sets for each instrument type, and opens all of these tables simultaneously when creating the portfolio during the execution of the READ statement in the RISK procedure.

 

To circumvent these errors, increase the limit to the number of files that the operating system allows to have open at the same time. For instructions, see Increasing the Per Process Limit on Open File Descriptors for your operating system.