The Quick Format function allows you to format internal volumes (LDEVs) in the background. While Quick Format operations are in process, you can perform other tasks to configure the storage system. The Quick Format functions enable you to set the system configurations such as path definition, file system creation, TrueCopy pair creation, before the completion of formatting. I/O operations from hosts are allowed during Quick Format, but performance might be affected because shared resources such as MP units and cache paths are used during Quick Format operations.
Do not start more than eight Quick Format operations at the same time. After eight or fewer Quick Format operations have started, you should not start more than four Quick Format operations at the same time, and you should monitor host I/O performance.