Le 08/11/2023 à 19:29:19+0100, David C. a écrit Hi David. > > What would be the number of replicas (in total and on each row) and their > distribution on the tree ? Well “inside” a row that would be 3 in replica mode. Between row...well two ;-) Beside to understanding how to write a rule a little more complex than the example in the official documentation, they are another purpose and it's to try to have a protocole for changing the hardware. For example if «row primary» are only with old bare metal server, and I have some new server I put inside the ceph and want to copy everything from the “row primary” to “row secondary”. Regards > > > Le mer. 8 nov. 2023 à 18:45, Albert Shih <Albert.Shih@xxxxxxxx> a écrit : > > Hi everyone, > > I'm totally newbie with ceph, so sorry if I'm asking some stupid question. > > I'm trying to understand how the crush map & rule work, my goal is to have > two groups of 3 servers, so I'm using “row” bucket > > ID CLASS WEIGHT TYPE NAME STATUS REWEIGHT PRI-AFF > -1 59.38367 root default > -15 59.38367 zone City > -17 29.69183 row primary > -3 9.89728 host server1 > 0 ssd 3.49309 osd.0 up 1.00000 1.00000 > 1 ssd 1.74660 osd.1 up 1.00000 1.00000 > 2 ssd 1.74660 osd.2 up 1.00000 1.00000 > 3 ssd 2.91100 osd.3 up 1.00000 1.00000 > -5 9.89728 host server2 > 4 ssd 1.74660 osd.4 up 1.00000 1.00000 > 5 ssd 1.74660 osd.5 up 1.00000 1.00000 > 6 ssd 2.91100 osd.6 up 1.00000 1.00000 > 7 ssd 3.49309 osd.7 up 1.00000 1.00000 > -7 9.89728 host server3 > 8 ssd 3.49309 osd.8 up 1.00000 1.00000 > 9 ssd 1.74660 osd.9 up 1.00000 1.00000 > 10 ssd 2.91100 osd.10 up 1.00000 1.00000 > 11 ssd 1.74660 osd.11 up 1.00000 1.00000 > -19 29.69183 row secondary > -9 9.89728 host server4 > 12 ssd 1.74660 osd.12 up 1.00000 1.00000 > 13 ssd 1.74660 osd.13 up 1.00000 1.00000 > 14 ssd 3.49309 osd.14 up 1.00000 1.00000 > 15 ssd 2.91100 osd.15 up 1.00000 1.00000 > -11 9.89728 host server5 > 16 ssd 1.74660 osd.16 up 1.00000 1.00000 > 17 ssd 1.74660 osd.17 up 1.00000 1.00000 > 18 ssd 3.49309 osd.18 up 1.00000 1.00000 > 19 ssd 2.91100 osd.19 up 1.00000 1.00000 > -13 9.89728 host server6 > 20 ssd 1.74660 osd.20 up 1.00000 1.00000 > 21 ssd 1.74660 osd.21 up 1.00000 1.00000 > 22 ssd 2.91100 osd.22 up 1.00000 1.00000 > > and I want to create a some rules, first I like to have > > a rule «replica» (over host) inside the «row» primary > a rule «erasure» (over host) inside the «row» primary > > but also two crush rule between primary/secondary, meaning I like to have a > replica (with only 1 copy of course) of pool from “row” primary to > secondary. > > How can I achieve that ? > > Regards > > > > -- > Albert SHIH 🦫 🐸 > mer. 08 nov. 2023 18:37:54 CET > _______________________________________________ > ceph-users mailing list -- ceph-users@xxxxxxx > To unsubscribe send an email to ceph-users-leave@xxxxxxx > -- Albert SHIH 🦫 🐸 Observatoire de Paris France Heure locale/Local time: jeu. 09 nov. 2023 08:39:41 CET _______________________________________________ ceph-users mailing list -- ceph-users@xxxxxxx To unsubscribe send an email to ceph-users-leave@xxxxxxx
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