Discarding

You might need to manually discard the Persistent Write Log (PWL) cache, for example, if the data in the cache has expired. You can discard a cache file for an image by using the rbd persistent-cache invalidate command. The command removes the cache metadata for the specified image, disables the cache feature, and deletes the local cache file, if it exists.

Prerequisites

  • A running IBM Storage Ceph cluster.

  • Root-level access to the monitor node.

  • PWL cache is enabled.

Procedure

  • Discard PWL cache:

    Syntax 

    rbd persistent-cache invalidate POOL_NAME/IMAGE_NAME

    Example 

    [ceph: root@host01 /]# rbd persistent-cache invalidate pool1/image1