Think of the osd numbers as names. The plugin interface doesn't even tell you which shard maps to which osd. Why would it make a difference? -Sam
On Wed, Jul 27, 2016 at 12:45 AM, Syed Hussain <syed...@gmail.com> wrote: > 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
