Re: Fancy striping support

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On Tue, Nov 26, 2013 at 9:21 PM, nicolasc <nicolas.canceill@xxxxxxxxxxx> wrote:
> Hi every one,
>
> The official doc for rbd mentions the "--stripe_count" and "--stripe_unit"
> options. If I understand correctly, these allow "fancy striping" — i.e.
> having multiple stripes in a single object. However, I tried and got an
> error:
> "unsupported stripe unit (got [my stripe unit] want 4194304)"
>
> It seems such behavior was introduced by a patch [1] in April. The message
> from Alex Elder reads: "We don't yet support fancy striping fully"
>
> I wonder what "fully" means, and where is Ceph now on the road to "fully"
> supporting fancy striping. Could anyone please enlighten me?

The kernel ceph clients (rbd and cephfs) don't support "fancy
striping". Only user space client supports it.

Yan, Zheng

>
> Best regards,
>
> Nicolas Canceill
> Scalable Storage Systems
> SURFsara (Amsterdam, NL)
>
> [1] http://www.spinics.net/lists/ceph-devel/msg14160.html
>
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