-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 Based on some discussion on where promotions were limited to only 10% increased the performance of the cache tier (sorry I can't find that discussion at the moment to reference). I've been reading through http://ceph.com/docs/master/rados/operations/cache-tiering/#configuring-a-cache-tier trying to figure out how to configure this type of promotion and try different values. I've reviewed the concepts of Bloom filters and so here are my questions: 1. Is a hit set an individual bloom filter? Or does the bloom filter keep track of the objects in the cache tier? 2. If each hit set is a Bloom filter... It seems limiting the rate of promotion could be configured by setting min_{read,write}_recency_for_promote > 1 (The object would need to be in more than 1 hit set, where each hit set is 3,600 seconds). But the documentation specifies "Currently there is minimal benefit for hit_set_count > 1 since the agent does not yet act intelligently on that information." My assumption would be to set min_read,write}_recency_for_promote = 4, set hit_set_count = 15 and hit_set_period to 300. This would require an object to be accessed at least in 4 different 5 minute intervals in the last hour to be promoted. Is this how these values are intended to be used? Does hit_set_count > 1 still not do anything? 3. I understand that there was some discussion about changing the tracking for promotion. Will the new method be available in Jewell? Is the current approach still being developed? Thanks, - ---------------- Robert LeBlanc PGP Fingerprint 79A2 9CA4 6CC4 45DD A904 C70E E654 3BB2 FA62 B9F1 -----BEGIN PGP SIGNATURE----- Version: Mailvelope v1.1.0 Comment: https://www.mailvelope.com wsFcBAEBCAAQBQJV/OH1CRDmVDuy+mK58QAAglEP/Rst1cPMKI50pzrtjNdm kuQ19W5LZmcXQU8zgHwpFzKgklFZxPrmOJD5nJ5peYYLwZr1g9F1HzPDZ33Y 7DbSIDztVoanhgLhhglxJ9Ok74cwQvIMRxyFCXUlZ3SjyV2FGv/jBjT7QpFf bv0sdpBwcyfaLvlwC0gpq7cwAmIp2YLW0YKzlhO/dfVCeGbSBUAdqiafkJ9U UTXdthQIU4i4dHx8BAJrIkvKZTumj5bBOL5ZJdGiG6v8MWNUlfZFDAEFkNz4 d+cfrPKNKmw28IcfqXVtGZ8BYQo0LHijdXOQH4kZ54wMIR4y0Sd0YaFclBnH tChS3qq9fwcJ7dNBrV0nOMuF3X2vYIxnExHccFfheeJLrL+g/r4aOWr4Pk1m sPJ0odWen1N4xUTXVikmXJNeEVyRYo8g458o+VfSOWg3SiS7Svt+w4k0ZTid TeeGIA04hB7fyxGD5nb1UFRrGTv0JsErPe6d55svulAUkgyXQkDnYvRCWNat H4BrlNjkH1zrSds9IQGNAY5pxeWQj0SNaL8m/y4lMWkYB3lRfhvP7a0MkBQK pmgOt9GWTR1faDeY7nHC6aHg2EwzuQ9qmcPjgxMR7vfa44+ydkONsixzXJZR fOpyl4VzNKq/15xu6GLRKGDQwilg4wDbl/HWJ3e9/6YtBSufg9Yzc1iS+k9u NJ4F =gmsw -----END PGP SIGNATURE----- _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
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