Hi, I somehow missed your message thanks for your effort to raise this issue Ansgar Am Di., 16. Jan. 2024 um 10:05 Uhr schrieb Eugen Block <eblock@xxxxxx>: > > Hi, > > I don't really have an answer, I just wanted to mention that I created > a tracker issue [1] because I believe there's a bug in the LRC plugin. > But there hasn't been any response yet. > > [1] https://tracker.ceph.com/issues/61861 > > Zitat von Ansgar Jazdzewski <a.jazdzewski@xxxxxxxxxxxxxx>: > > > hi folks, > > > > I currently test erasure-code-lrc (1) in a multi-room multi-rack setup. > > The idea is to be able to repair a disk-failures within the rack > > itself to lower bandwidth-usage > > > > ```bash > > ceph osd erasure-code-profile set lrc_hdd \ > > plugin=lrc \ > > crush-root=default \ > > crush-locality=rack \ > > crush-failure-domain=host \ > > crush-device-class=hdd \ > > mapping=__DDDDD__DDDDD__DDDDD__DDDDD \ > > layers=' > > [ > > [ "_cDDDDD_cDDDDD_cDDDDD_cDDDDD", "" ], > > [ "cDDDDDD_____________________", "" ], > > [ "_______cDDDDDD______________", "" ], > > [ "______________cDDDDDD_______", "" ], > > [ "_____________________cDDDDDD", "" ], > > ]' \ > > crush-steps='[ > > [ "choose", "room", 4 ], > > [ "choose", "rack", 1 ], > > [ "chooseleaf", "host", 7 ], > > ]' > > ``` > > > > The roule picks 4 out of 5 rooms and keeps the PG in one rack like expected! > > > > However it looks like the PG will not move to another Room if the PG > > is undersized or the entire Room or Rack is down! > > > > Questions: > > * do I miss something to allow LRC (PG's) to move across Racks/Rooms > > for repair? > > * Is it even possible to build such a 'Multi-stage' grushmap? > > > > Thanks for your help, > > Ansgar > > > > 1) https://docs.ceph.com/en/quincy/rados/operations/erasure-code-jerasure/ > > _______________________________________________ > > ceph-users mailing list -- ceph-users@xxxxxxx > > To unsubscribe send an email to ceph-users-leave@xxxxxxx > > > _______________________________________________ > ceph-users mailing list -- ceph-users@xxxxxxx > To unsubscribe send an email to ceph-users-leave@xxxxxxx _______________________________________________ ceph-users mailing list -- ceph-users@xxxxxxx To unsubscribe send an email to ceph-users-leave@xxxxxxx
 |