# Disk Logging

Substation ES Log and Trace Agents can write recorded information to disk files.

To log information to disk files, you must perform some additional tasks before the files can be used and Substation ES is started.
Note: For JES2 systems, do not enable the disk logging feature until after successful execution of the Substation ES IVPs.
Note: If you intend to use VSAM DISK LOGGING or TRACING on a heavily used Substation ES, you can reduce the overhead of the VSAM disk I/O by increasing the VSAM "RECSZ" parameter found in JOB <userhlq>.JCL(SXGLDEF). For Log VSAM file, change 2400 to 8096 (the size will vary based on machine and disk throughput). For the Trace VSAM file, change 9600 to 16384. To get the best results for your installation, TIBCO recommends that you try different sizes (8K, 12K, 16K, etc).

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