主页
产品
Red Hat Ceph Storage
8
存储策略指南
2.10. CRUSH 存储策略示例

2.10. CRUSH 存储策略示例

如果您希望将大多数池默认为由大型硬盘支持的 OSD，但有一些池映射到由快速固态驱动器(SSD)支持的 OSD。CRUSH 可以轻松地处理这些场景。

使用设备类。这个过程很简单，可向每个设备添加一个类。

语法

ceph osd crush set-device-class CLASS OSD_ID [OSD_ID]

ceph osd crush set-device-class CLASS OSD_ID [OSD_ID]

Copy to Clipboard

Toggle word wrap

示例

[ceph:root@host01 /]# ceph osd crush set-device-class hdd osd.0 osd.1 osd.4 osd.5
[ceph:root@host01 /]# ceph osd crush set-device-class ssd osd.2 osd.3 osd.6 osd.7

[ceph:root@host01 /]# ceph osd crush set-device-class hdd osd.0 osd.1 osd.4 osd.5
[ceph:root@host01 /]# ceph osd crush set-device-class ssd osd.2 osd.3 osd.6 osd.7

Copy to Clipboard

Toggle word wrap

然后，创建使用设备的规则。

语法

ceph osd crush rule create-replicated RULENAME ROOT FAILURE_DOMAIN_TYPE DEVICE_CLASS

ceph osd crush rule create-replicated RULENAME ROOT FAILURE_DOMAIN_TYPE DEVICE_CLASS

Copy to Clipboard

Toggle word wrap

示例

[ceph:root@host01 /]# ceph osd crush rule create-replicated cold default host hdd
[ceph:root@host01 /]# ceph osd crush rule create-replicated hot default host ssd

[ceph:root@host01 /]# ceph osd crush rule create-replicated cold default host hdd
[ceph:root@host01 /]# ceph osd crush rule create-replicated hot default host ssd

Copy to Clipboard

Toggle word wrap

最后，将池设置为使用规则。

语法

ceph osd pool set POOL_NAME crush_rule RULENAME

ceph osd pool set POOL_NAME crush_rule RULENAME

Copy to Clipboard

Toggle word wrap

示例

[ceph:root@host01 /]# ceph osd pool set cold crush_rule hdd
[ceph:root@host01 /]# ceph osd pool set hot crush_rule ssd

[ceph:root@host01 /]# ceph osd pool set cold crush_rule hdd
[ceph:root@host01 /]# ceph osd pool set hot crush_rule ssd

Copy to Clipboard

Toggle word wrap

不需要手动编辑 CRUSH map，因为一种层次结构可以服务于多类设备。

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
  }

Copy to Clipboard

Toggle word wrap

返回顶部

2.10. CRUSH 存储策略示例

学习

尝试、购买和销售

社区

关于红帽文档

让开源更具包容性

關於紅帽

Theme

Red Hat legal and privacy links

Red Hat legal and privacy links