Chapter 38. Removing a Cache Tier

Change the cache-mode to none to disable it. :

ceph osd tier cache-mode {cachepool} none

For example:

ceph osd tier cache-mode hot-storage none

Remove the cache pool from the backing pool. :

ceph osd tier remove {storagepool} {cachepool}

For example:

ceph osd tier remove cold-storage hot-storage

Change the cache mode to forward so that new and modified objects will flush to the backing storage pool. :

ceph osd tier cache-mode {cachepool} forward

For example:

ceph osd tier cache-mode hot-storage forward

Ensure that the cache pool has been flushed. This may take a few minutes:

rados -p {cachepool} ls

If the cache pool still has objects, you can flush them manually. For example:

rados -p {cachepool} cache-flush-evict-all

Remove the overlay so that clients will not direct traffic to the cache. :

ceph osd tier remove-overlay {storagetier}

For example:

ceph osd tier remove-overlay cold-storage

Finally, remove the cache tier pool from the backing storage pool. :

ceph osd tier remove {storagepool} {cachepool}

For example:

ceph osd tier remove cold-storage hot-storage