Anthony D'Atri wrote: > Hmm. Perhaps using the RADOS CLI approaches the pool differently than > going through RBD, RGW, or CephFS? In fact, I first discovered this using librados (rados_write() and rados_append()). Both work correctly when creating a new object, i.e. starting from offset 0, and fail for non-zero offsets, and appending to a non-empty object, respectively. -Yenya > Unless someone knows better I’ll adjust the docs to advise setting > overwrites all the time, I’m not aware of a counterindication. > > > On Sep 5, 2025, at 7:14 AM, Jan Kasprzak <kas@xxxxxxxxxx> wrote: > > > > Hello, Ceph users, > > > > my erasure-coded pool is inconsistent with the documentation, > > apparently existing objects cannot be appended to. > > The documentation states the following: > > > > ================ > > https://docs.ceph.com/en/latest/rados/operations/erasure-code/ > > By default, erasure-coded pools work only with operations that perform > > full object writes and appends (for example, RGW). > > ================ > > > > Appends do not work for me: > > > > $ ceph osd pool create test-ec erasure k5m2 > > pool 'test-ec' created > > $ echo -n 12345678 | rados --pool test-ec put testobj - > > $ rados --pool test-ec stat testobj > > test-ec/testobj mtime 2025-09-05T12:51:20.000000+0200, size 8 > > $ echo -n 12345678 | rados --pool test-ec put testobj - --offset 8 > > error putting test-ec/testobj: (95) Operation not supported > > $ echo -n 12345678 | rados --pool test-ec append testobj - > > error appending test-ec/testobj: (95) Operation not supported > > > > When I enable the allow_ec_overwrites flag, everything works as > expected: > > > > $ ceph osd pool set test-ec allow_ec_overwrites true > > set pool 73 allow_ec_overwrites to true > > $ echo -n 12345678 | rados --pool test-ec put testobj - --offset 8 > > $ echo -n 12345678 | rados --pool test-ec append testobj - > > $ rados --pool test-ec stat testobj > > test-ec/testobj mtime 2025-09-05T12:54:30.000000+0200, size 24 > > > > Should the documentation be fixed somehow (maybe appending works only > > at certain block sizes or whatever), or am I doing something > incorrect? > > My cluster is Ceph 19.2.2. > > > > Thanks, > > > > -Yenya > > > > -- > > | Jan "Yenya" Kasprzak <kas at {fi.muni.cz - work | yenya.net - > private}> | > > | https://www.fi.muni.cz/~kas/ GPG: > 4096R/A45477D5 | > > We all agree on the necessity of compromise. We just can't agree on > > when it's necessary to compromise. --Larry Wall > > _______________________________________________ > > ceph-users mailing list -- ceph-users@xxxxxxx > > To unsubscribe send an email to ceph-users-leave@xxxxxxx -- | Jan "Yenya" Kasprzak <kas at {fi.muni.cz - work | yenya.net - private}> | | https://www.fi.muni.cz/~kas/ GPG: 4096R/A45477D5 | We all agree on the necessity of compromise. We just can't agree on when it's necessary to compromise. --Larry Wall _______________________________________________ ceph-users mailing list -- ceph-users@xxxxxxx To unsubscribe send an email to ceph-users-leave@xxxxxxx
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