Re: Best practices for allocating memory to bluestore cache

[David Turner <drakonstein@xxxxxxxxx>]

Be very careful trying to utilize more RAM while your cluster is healthy. When you're going to need the extra RAM is when you're closer is unhealthy and your osds are peering, recovering, backfilling, etc. That's when the osd daemons start needing the RAM that is recommended in the docs.

On Thu, Aug 30, 2018, 4:21 PM Tyler Bishop <tyler.bishop@xxxxxxxxxxxxxxxxx> wrote:

Hi,

My OSD host has 256GB of ram and I have 52 OSD.  Currently I have the cache set to 1GB and the system only consumes around 44GB of ram and the other ram sits as unallocated because I am using bluestore vs filestore.

The documentation: http://docs.ceph.com/docs/master/rados/configuration/bluestore-config-ref/ list the defaults of ram to be used almost exclusively for the KV cache.

With a system like mine do you think It would be safe to allow 3GB cache and change the KV ratio to 0.60?

Thanks

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Tyler Bishop

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