[ceph-users] Bareos and libradosstriper works only for 4M sripe_unit size

Alexander Kushnirenko kushnirenko at gmail.com
Wed Oct 11 05:16:59 PDT 2017


Hi, Ian!

Thank you for your reference!

Could you comment on the following rule:
object_size = stripe_unit * stripe_count
Or it is not necessarily so?

I refer to page 8 in this report:

https://indico.cern.ch/event/531810/contributions/2298934/at
tachments/1358128/2053937/Ceph-Experience-at-RAL-final.pdf


Alexander.

On Wed, Oct 11, 2017 at 1:11 PM, <ian.johnson at stfc.ac.uk> wrote:

> Hi Gregory
>
> You’re right, when setting the object layout in libradosstriper, one
> should set all three parameters (the number of stripes, the size of the
> stripe unit, and the size of the striped object). The Ceph plugin for
> GridFTP has an example of this at https://github.com/stfc/gridFT
> PCephPlugin/blob/master/ceph_posix.cpp#L371
>
>
>
> At RAL, we use the following values:
>
>
>
> $STRIPER_NUM_STRIPES 1
>
> $STRIPER_STRIPE_UNIT 8388608
>
> $STRIPER_OBJECT_SIZE 67108864
>
>
>
> Regards,
>
>
>
> Ian Johnson MBCS
>
> Data Services Group
>
> Scientific Computing Department
>
> Rutherford Appleton Laboratory
>
>
>
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>
>
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