2.10. CRUSH 스토리지 전략의 예

ceph osd crush set-device-class <class> <osdId> [<osdId>]
ceph osd crush set-device-class hdd osd.0 osd.1 osd.4 osd.5
ceph osd crush set-device-class ssd osd.2 osd.3 osd.6 osd.7

# ceph osd crush set-device-class <class> <osdId> [<osdId>]
# ceph osd crush set-device-class hdd osd.0 osd.1 osd.4 osd.5
# ceph osd crush set-device-class ssd osd.2 osd.3 osd.6 osd.7

ceph osd crush rule create-replicated <rule-name> <root> <failure-domain-type> <device-class>:
ceph osd crush rule create-replicated cold default host hdd
ceph osd crush rule create-replicated hot default host ssd

# ceph osd crush rule create-replicated <rule-name> <root> <failure-domain-type> <device-class>:
# ceph osd crush rule create-replicated cold default host hdd
# ceph osd crush rule create-replicated hot default host ssd

ceph osd pool set <poolname> crush_rule <rule-name>
ceph osd pool set cold crush_rule hdd
ceph osd pool set hot crush_rule ssd

ceph osd pool set <poolname> crush_rule <rule-name>
ceph osd pool set cold crush_rule hdd
ceph osd pool set hot crush_rule ssd

device 0 osd.0 class hdd
device 1 osd.1 class hdd
device 2 osd.2 class ssd
device 3 osd.3 class ssd
device 4 osd.4 class hdd
device 5 osd.5 class hdd
device 6 osd.6 class ssd
device 7 osd.7 class ssd

  host ceph-osd-server-1 {
      id -1
      alg straw2
      hash 0
      item osd.0 weight 1.00
      item osd.1 weight 1.00
      item osd.2 weight 1.00
      item osd.3 weight 1.00
  }

  host ceph-osd-server-2 {
      id -2
      alg straw2
      hash 0
      item osd.4 weight 1.00
      item osd.5 weight 1.00
      item osd.6 weight 1.00
      item osd.7 weight 1.00
  }

  root default {
      id -3
      alg straw2
      hash 0
      item ceph-osd-server-1 weight 4.00
      item ceph-osd-server-2 weight 4.00
  }


  rule cold {
      ruleset 0
      type replicated
      min_size 2
      max_size 11
      step take default class hdd
      step chooseleaf firstn 0 type host
      step emit
  }


  rule hot {
      ruleset 1
      type replicated
      min_size 2
      max_size 11
      step take default class ssd
      step chooseleaf firstn 0 type host
      step emit
  }

device 0 osd.0 class hdd
device 1 osd.1 class hdd
device 2 osd.2 class ssd
device 3 osd.3 class ssd
device 4 osd.4 class hdd
device 5 osd.5 class hdd
device 6 osd.6 class ssd
device 7 osd.7 class ssd

  host ceph-osd-server-1 {
      id -1
      alg straw2
      hash 0
      item osd.0 weight 1.00
      item osd.1 weight 1.00
      item osd.2 weight 1.00
      item osd.3 weight 1.00
  }

  host ceph-osd-server-2 {
      id -2
      alg straw2
      hash 0
      item osd.4 weight 1.00
      item osd.5 weight 1.00
      item osd.6 weight 1.00
      item osd.7 weight 1.00
  }

  root default {
      id -3
      alg straw2
      hash 0
      item ceph-osd-server-1 weight 4.00
      item ceph-osd-server-2 weight 4.00
  }


  rule cold {
      ruleset 0
      type replicated
      min_size 2
      max_size 11
      step take default class hdd
      step chooseleaf firstn 0 type host
      step emit
  }


  rule hot {
      ruleset 1
      type replicated
      min_size 2
      max_size 11
      step take default class ssd
      step chooseleaf firstn 0 type host
      step emit
  }