Log structure names

As you define your log structures, consider adopting a naming convention for your log structures that helps to identify the purpose of the structure. For example, you can use a format such as LOG_purpose_nnn:

• purpose identifies how you use the structure.
• nnn is a sequence number to allow for more than one structure for each purpose.

For example, you might choose the following names:

LOG_IGWLOG_001

For the DFSMStvs system log. The structure should be large to avoid the need to write data to DASD.

LOG_IGWSHUNT_001

For the DFSMStvs secondary system log. The structure should be small. However, it requires a large buffer size. A structure of 100 KB per log stream is usually sufficient.

LOG_FORWARD_001

For forward recovery logs in which block writes are forced periodically.

LOG_IGWLGLGS_001

For the log of logs.

These examples define one structure per log. Multiple log streams can be within a single structure so defining this many log structures is optional.