File Pool Log Data

To help protect the integrity of the control data, as well as repository data, a server maintains two file pool log minidisks. In the file pool logs, the server records changes to the file pool so that if the system encounters a problem and stops in the middle of an operation, the file pool is not damaged. In some cases the file pool logs are also needed so applications can roll back (undo) changes they have made.

To appreciate the importance of the file pool log minidisks and how file pool integrity is maintained, it is necessary to understand a little about how the server processes user requests. Some background knowledge in this area could also be useful in helping programmers with errors they may experience while developing applications that use SFS.

If the server is a CRR recovery server, there are also two CRR log minidisks. The CRR logs record the state of all resources participating in a CRR coordinated transaction. CRR uses the CRR log information to ensure updates to all protected resources within the coordinated transaction are either done or not done.