Usually TXSeries users would configure TXSeries regions to meet their architecture requirements. But users miss to configure and tune SFS volumes (both data and log volumes). Whenever a default region (SFS Server as File Manager) is created in TXSeries, SFS Server with the hostname is also created with default settings. Default settings include SFS Log Volume size and SFS Server Data Volume size.
Log Volume is used to store a SFS Servers log files. The data in this
volume is used during recovery of transactions. The recovery data
typically would include non-committed SFS Server data.
Data Volume is used to store a SFS Severs application data. Committed
data in SFS Server is stored in SFS Server’s data volume.
the SFS Server fails to commit the data to data volume then the SFS log
volume is used during the recovery process. Once the data is committed
in data volume, entries in the log volumes are deleted. A typical
setting of log volume size could be something like 100MB and data
volume size as 2GB.
Steps to follow for configuring SFS Server’s volume size.
creating the SFS Server, understand how much log volume and data volume
size is necessary for your architecture. In this example, im setting
SFS log volume size as 128MB and SFS data volume size as 1GB.
Set the environment variable CICS_SFS_LOGICAL_PARTITION_SIZE to
Physical partition size in the machine. Physical partition size can be
obtained by running ‘lsvg rootvg’ command.
b) Set the environment variable CICS_SFS_LOG_SIZE to 128MB . This environment variable takes input in MB
c) Set the environment variable CICS_SFS_DATA_SIZE to 1024 MB(1 GB). This environment variable takes input in MB
For any further information on this, refer TXSeries Infocenter documentation.