Re: local mode -- a new tier mode

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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
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