Thank you. I look forward to hearing from you. On Wed, 16 Oct 2019 at 04:24, Sam Just <sjust@xxxxxxxxxx> wrote: > > This is quite interesting. I'll have a closer look this week and get > back to you with questions! > -Sam > > On Tue, Oct 15, 2019 at 5:15 AM Ning Yao <zay11022@xxxxxxxxx> wrote: > > > > Honggang(Joseph) Yang <eagle.rtlinux@xxxxxxxxx> 于2019年10月12日周六 上午12:04写道： > >> > >> 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. > >> > >> > > > > I'm quite interesting about this and seems quite promising. But it seems objects level tier seems still not efficient enough in the small write scenario (4k ~ 8k based on your fio test result), right? > > Now, in bluestore, it is possbile to implement a fine-grain local tier. it seems bluestore_pextent_t may be allocated from different devices and strategies like extent level hitset to evaluate whether some extents need to demote to slow devices. A promotion or demotion may submit a read with write operations in a transactions, and finished with a onode or blobs flushed into rocksdb. > > > >> 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 > >> _______________________________________________ > >> Dev mailing list -- dev@xxxxxxx > >> To unsubscribe send an email to dev-leave@xxxxxxx > > > > _______________________________________________ > > Dev mailing list -- dev@xxxxxxx > > To unsubscribe send an email to dev-leave@xxxxxxx > _______________________________________________ Dev mailing list -- dev@xxxxxxx To unsubscribe send an email to dev-leave@xxxxxxx
