Re: status of fancy striping for krbd

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On Mon, Sep 30, 2013 at 5:33 PM, Sage Weil <sage@xxxxxxxxxxx> wrote:
> On Mon, 30 Sep 2013, Dan van der Ster wrote:
>> Hi all,
>> I just noticed that krbd supports mapping format v2 images in 3.11,
>> but it doesn't yet support STRIPINGV2. Is this coming anytime soon?
>
> We don't have immediate plans to add the striping feature.  You may be the
> first person to ask for it.  :)

One of our students ran some preliminary tests under qemu and found
that fancy striping was worth turning on for his tests at least.

We will re-run the tests over the next couple weeks and fully quantify
how much it helps our typical use-cases.

Cheers, Dan


> The challenge is that it requires a fair bit of refactoring in the
> osd_client layer to do scatter/gather type IO.  The nice thing is that
> this will equally benefit CephFS, which supports the same range of
> striping configurations.
>
> sage
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