Hi,
this question comes up regularly and is been discussed just now:
http://lists.ceph.com/pipermail/ceph-users-ceph.com/2019-May/034867.html
Regards,
Eugen
Zitat von Yoann Moulin <yoann.moulin@xxxxxxx>:
Dear all,
I am doing some tests with Nautilus and cephfs on erasure coding pool.
I noticed something strange between k+m in my erasure profile and
size+min_size in the pool created:
test@icadmin004:~$ ceph osd erasure-code-profile get ecpool-4-2
crush-device-class=
crush-failure-domain=osd
crush-root=default
jerasure-per-chunk-alignment=false
k=4
m=2
plugin=jerasure
technique=reed_sol_van
w=8
test@icadmin004:~$ ceph --cluster test osd pool create cephfs_data
8 8 erasure ecpool-4-2
pool 'cephfs_data' created
test@icadmin004:~$ ceph osd pool ls detail | grep cephfs_data
pool 14 'cephfs_data' erasure size 6 min_size 5 crush_rule 1
object_hash rjenkins pg_num 8 pgp_num 8 autoscale_mode warn
last_change 2646 flags hashpspool stripe_width 16384
Why min_size = 5 and not 4 ?
Best,
--
Yoann Moulin
EPFL IC-IT
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