On 9/10/2018 8:26 PM, Mark Nelson wrote:
On 09/10/2018 12:22 PM, Igor Fedotov wrote:
Just in case - is slow_used_bytes equal to 0? Some DB data might
reside at slow device if spill over has happened. Which doesn't
require full DB volume to happen - that's by RocksDB's design.
And recommended numbers are a bit... speculative. So it's quite
possible that you numbers are absolutely adequate.
FWIW, these are the numbers I came up with after examining the SST
files generated under different workloads:
https://drive.google.com/file/d/1Ews2WR-y5k3TMToAm0ZDsm7Gf_fwvyFw/view?usp=sharing
Sorry, Mark. Speculative is a bit too strong word... I meant that
two-parameter sizing model describing such a complex system as Ceph
might tend to produce quite inaccurate results often enough...
Regards,
Nick
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