Review the following information about maintenance activities and ShadowImage operations:
- Cache maintenance can reduce overall performance and should be scheduled during times of low system activity.
- Maintenance of physical drives used by ShadowImage volumes can be performed without impacting pair operations.
- If a physical device failure occurs, the pair status is not affected because of the RAID architecture.
- If a physical device failure requires the storage system to use dynamic sparing or automatic correction copy, the pair status is not be affected.
- If an LDEV failure occurs, the storage system suspends the pair.
- Certain activities are not allowed for ShadowImage volumes. If you want to block (for maintenance), format, or restore an LDEV that is used by ShadowImage, you must suspend the pair (PSUE status).