Hi Honggang,
I personally I find this very exciting! I was hoping that we might
eventually try local caching in bluestore especially given trends for
larger NVMe devices and pmem. When you were running performance tests,
did you run any tests where the data set size was significantly larger
than the available "fast" local tier cache (ie so that eviction was
taking place)? In the past, that's been the area we've really needed to
focus on getting right.
Mark
On 10/11/19 11:04 AM, Honggang(Joseph) Yang wrote:
Hi,
We implemented a new cache tier mode - local mode. In this mode, an
osd is configured to manage two data devices, one is fast device, one
is slow device. Hot objects are promoted from slow device to fast
device, and demoted from fast device to slow device when they become
cold.
The introduction of tier local mode in detail is
https://tracker.ceph.com/issues/42286
tier local mode: https://github.com/yanghonggang/ceph/commits/wip-tier-new
This work is based on ceph v12.2.5. I'm glad to port it to master
branch if needed.
Any advice and suggestions will be greatly appreciated.
thx,
Yang Honggang
