I have a Ceph Cluster with 500 TB of capacity. I want to create cache tier for it.
I have a 20TB SSD. Is that sufficient for use 20 TB for cache 500TB? what is the best way to calculate it?
What is the best size for cache tier in Ceph?
1.9k Views Asked by yasin lachini At
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Traditionally, we recommend one SSD cache drive for 5 to 7 HDD. properly, today, SSDs are not used as a cache tier, they cache at the Bluestore layer, as a WAL device.
Depending on the use case, capacity of the Bluestore Block.db can be 4% of the total capacity (Block, CephFS) or less (Object store).
Especially for a small Ceph cluster (less than 1 PB raw storage), it makes sense to consider all-SSD storage, particularly for the Block use case, as prices of solid state and HDD are not that distant for medium capacity drives.