Re: RBD volumes for bare-metal hosts

[Dongsheng Yang <dongsheng.yang@easystack.cn>]

On 07/06/2016 07:41 AM, Ilya Dryomov wrote:
> On Wed, Jul 6, 2016 at 12:16 AM, Radoslaw Zarzynski
> <rzarzynski@mirantis.com> wrote:
>> Hello Guys,
>>
>> I wonder about a method for providing bare-metal hosts with an access
>> to RBD volumes.
>>
>> The most obvious solution is krbd. Unfortunately, it has a substantial
>> feature gap in comparison to librbd [1][2]. exclusive-lock seems to be
>> the basic dependency that should be satisfied to even start thinking
>> about the rest. Is someone working on this feature? What are the plans
>> in general?
> The code for exclusive-lock, object-map and fast-diff is pretty much
> ready.

Hi Ilya,
     Sounds great! But where can I read these code, I did not find it
in https://github.com/ceph/ceph-client. could you give a reference
for it. thanx a lot.

Yang
>   We had a large prerequisite that had to go in before any of
> these and it's been merged into 4.7, so it's now a matter of review and
> more comprehensive testing.  deep-flatten isn't ready, but should
> follow shortly after.
>
> Note that you can disable all of these features dynamically and that
> the image is perfectly usable with none of them enabled.  Unless you
> have clones or discard a lot, in which case object-map can help, the
> I/O path is the same.
>
> No concrete plans for mirroring support yet.
>
> Thanks,
>
>                  Ilya
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