# Discarding Pinned Cache

If the controller loses access to one or more virtual drives, the controller preserves the data from the virtual drive. This preserved cache is called as pinned cache. This cache is preserved until you import the virtual drive or discard the cache. As long as there is pinned cache, you cannot perform certain operations on the virtual drive.
Attention:

If there are any foreign configurations, import the foreign configuration before you discard the pinned cache. Otherwise, you might lose data that belongs to the foreign configuration.

Perform the following steps to discard the pinned cache.

1. In the Controller dashboard, select More Actions > Discard Preserved Cache.
   Note: The Discard Preserved Cache option is displayed only if pinned cache is present on the controller.

   A message appears, prompting you to confirm your choice.

2. Select Confirm and click Yes, Discard.

Parent topic: Managing Controllers