Fundamentally, I wanted to know what chunks are allocated in which OSDs. This way I can preserve the array structure required for my Erasure Code. If all the chunks are placed in randomly ordered OSDs (like in Jerasure or ISA) then I loss that array structure required in the Encoding/Decoding algorithm of my Plugin. I'm trying to develop an Erasure Code plugin for RDP (or RAID-DP) kind of code.
Thanks, Syed On Wed, Jul 27, 2016 at 4:12 AM, Samuel Just <sj...@redhat.com> wrote: > Why do you want them in serial increasing order? > -Sam > > On Tue, Jul 26, 2016 at 2:43 PM, Samuel Just <sj...@redhat.com> wrote: > >> How would such a code work if there were more than 24 osds? >> -Sam >> >> On Tue, Jul 26, 2016 at 2:37 PM, Syed Hussain <syed...@gmail.com> wrote: >> >>> Hi, >>> >>> I'm working to develop an Erasure Code plugin (variation of ISA) that >>> have typical requirement that the active set of the Erasure Coded pool in >>> serial order. >>> For example, >>> >>> ==================================================================================================== >>> >ceph osd erasure-code-profile set reed_k16m8_isa k=16 m=8 plugin=isa >>> technique=reed_sol_van ruleset-failure-domain=osd >>> >ceph osd pool create reed_k16m8_isa_pool 128 128 erasure reed_k16m8_isa >>> >echo "ABCDEFGHIABCDEFGHIABCDEFGHIABCDEFGHIABCDEFGHIABCDEFGHI" | rados >>> --pool reed_k16m8_isa_pool put myobj16_8 - >>> >ceph osd map reed_k16m8_isa_pool myobj16_8 >>> osdmap e86 pool 'reed_k16m8_isa_pool' (1) object 'myobj16_8' -> pg >>> 1.cf6ec86f (1.6f) -> up >>> ([4,23,22,10,9,11,15,6,19,1,7,8,17,21,16,14,18,12,13,20,3,5,0,2], p4) >>> acting ([4,23,22,10,9,11,15,6,19,1,7,8,17,21,16,14,18,12,13,20,3,5,0,2], p4) >>> >>> ==================================================================================================== >>> >>> That means the chunks 0, 1, 2, ...23 of the erasure coding are saved int >>> osd 4, 23, 22, 10, ...2 respectively as per the order given in the active >>> set. >>> >>> Now my question is how I'll be able to get the PG map for object >>> myobj16_8 having active set as: [0, 1, 2, ...23] so that the i-th chunk of >>> the Erasure Coded object saves into >>> i-th osd. >>> >>> Is there any option available in "ceph osd pool create" to do it? >>> Or there may be other way available to accomplish this case. >>> >>> Appreciate your suggestions.. >>> >>> Thanks, >>> Syed Hussain >>> NetWorld >>> >>> _______________________________________________ >>> ceph-users mailing list >>> ceph-users@lists.ceph.com >>> http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com >>> >>> >> >
_______________________________________________ ceph-users mailing list ceph-users@lists.ceph.com http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
