Creating a cache tier
In the last recipe, we created a pool, cache-pool, based on SSDs. We will now use this pool as a cache tier for the erasure-coded pool, EC-pool, that we created earlier in this chapter:
The upcoming instructions will guide you through the creation of a cache tier with the writeback mode and how to set the overlay with an EC-pool.
How to do it...
Following this set of steps, we will create a cache tier for our erasure-coded pool:
- Create a cache tier that will associate storage-pools with cache-pools. The syntax is
ceph osd tier add <storage_pool> <cache_pool>:
# ceph osd tier add EC-pool cache-pool- Set the cache mode as either writeback or read-only. In this demonstration, we will use writeback, and the syntax is
ceph osd tier cache-mode <cache_pool> writeback:
# ceph osd tier cache-mode cache-pool writeback- To direct all the client requests from the standard pool to the cache pool, set the pool overlay using the syntax
ceph osd tier set-overlay...
