Re: RDMA power failure write atomicity

Asgeir Eiriksson
2016-03-11T01:33:39Z

Vladislav,

This is an area of active R&D

You might be interested in the following (at ietf.org):

Title : RDMA Durable Write Commit
Authors : Tom Talpey
Jim Pinkerton
<>
Filename : draft-talpey-rdma-commit-00.txt
Pages : 24
Date : 2016-02-19

Regards,

‘Asgeir

> On Mar 10, 2016, at 3:45 PM, Vladislav Bolkhovitin <vst-d+Crzxg7Rs0@public.gmane.org> wrote:
>
> Hello,
>
> I'm currently considering to use NVDIMM behind RDMA and wonder what is RDMA power
> failure write atomicity? I mean, what is minimal size and alignment guaranteed to be
> written atomically in face of power failure (or some other similar failure), i.e.
> either written in full, or not written at all?
>
> For memory writes on Intel it is 8 bytes with 8 bytes alignment. Is there anything like
> this for RDMA? Or different vendors/implementation have so different expectations and
> promises, so you can not assume anything >1 byte?
>
> I can't find such info anywhere.
>
> Thanks,
> Vlad