Oh! I put a wrong link, sorry The picture which explains stripe_unit and stripe count is here:
https://indico.cern.ch/event/330212/contributions/1718786/attachments/642384/883834/CephPluginForXroot.pdf I tried to attach it in the mail, but it was blocked. On Wed, Oct 11, 2017 at 3:16 PM, Alexander Kushnirenko < kushnire...@gmail.com> wrote: > 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.john...@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 >> >> >> >> _______________________________________________ >> ceph-users mailing list >> ceph-users@lists.ceph.com >> http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com >> >> >
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