Procedure for migrating wal.db to ssd

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Hi Everyone,

I am running a containerized pacific cluster 15.2.15 with 80 spinning disks and 20 SSD. Currently the SSDs are being used as a cach tier and holds the metadata pool for cephfs. I think we could make better use of the SSDs by moving block.wal and block.db to the SSDs and I have a few questions about this.


  *   How do I change my config to hold block.db and block.wal? Do I need to fail out drives and then re-create them? What is the proper procedure for this?
  *   How do I determine the number of spinning drives that can share one SSD?
  *   Is this a good idea? Am I likely to see a performance increase – what kinds of workflows will benefit from this change?

Thanks for your help!

Erik Anderson
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