分布式存储系统之Ceph集群存储池操作 _生活百科

前文我们了解了ceph的存储池、PG、CRUSH、客户端IO的简要工作过程、Ceph客户端计算PG_ID的步骤的相关话题，回顾请参考https://www.cnblogs.com/qiuhom-1874/p/16733806.html；今天我们来聊一聊在ceph上操作存储池相关命令的用法和说明；
在ceph上操作存储池不外乎就是查看列出、创建、重命名和删除等操作，常用相关的工具都是“ceph osd pool”的子命令， ls、create、rename和rm等；
1、创建存储池
副本型存储池创建命令格式
ceph osd pool create <pool-name> <pg-num> [pgp-num] [replicated] [crush-rule-name] [expected-num-objects]提示：创建副本型存储池上面的必要选项有存储池的名称和PG的数量，后面可以不用跟pgp和replicated来指定存储池的pgp的数量和类型为副本型；即默认创建不指定存储池类型，都是创建的是副本池；
纠删码池存储池创建命令格式
ceph osd pool create <pool-name> <pg-num> <pgp-num> erasure [erasure-code-profile] [crush-rule-name] [expected-num-objects]提示：创建纠删码池存储池，需要给定存储池名称、PG的数量、PGP的数量已经明确指定存储池类型为erasure；这里解释下PGP，所谓PGP（Placement Group for Placement purpose）就是用于归置的PG数量，其值应该等于PG的数量； crush-ruleset-name是用于指定此存储池所用的CRUSH规则集的名称，不过，引用的规则集必须事先存在；
erasure-code-profile参数是用于指定纠删码池配置文件；未指定要使用的纠删编码配置文件时，创建命令会为其自动创建一个，并在创建相关的CRUSH规则集时使用到它；默认配置文件自动定义k=2和m=1，这意味着Ceph将通过三个OSD扩展对象数据，并且可以丢失其中一个OSD而不会丢失数据，因此，在冗余效果上，它相当于一个大小为2的副本池，不过，其存储空间有效利用率为2/3而非1/2 。
示例：创建一个副本池

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示例：创建一个纠删码池

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2、获取存储池的相关信息
列出存储池：ceph osd pool ls [detail]
[cephadm@ceph-admin ~]$ ceph osd pool lstestpoolrbdpool.rgw.rootdefault.rgw.controldefault.rgw.metadefault.rgw.logcephfs-metadatpoolcephfs-datapoolreppoolerasurepool[cephadm@ceph-admin ~]$ ceph osd pool ls detailpool 1 'testpool' replicated size 3 min_size 2 crush_rule 0 object_hash rjenkins pg_num 16 pgp_num 16 last_change 42 flags hashpspool stripe_width 0pool 2 'rbdpool' replicated size 3 min_size 2 crush_rule 0 object_hash rjenkins pg_num 64 pgp_num 64 last_change 81 flags hashpspool,selfmanaged_snaps stripe_width 0 application rbdremoved_snaps [1~3]pool 3 '.rgw.root' replicated size 3 min_size 2 crush_rule 0 object_hash rjenkins pg_num 8 pgp_num 8 last_change 84 owner 18446744073709551615 flags hashpspool stripe_width 0 application rgwpool 4 'default.rgw.control' replicated size 3 min_size 2 crush_rule 0 object_hash rjenkins pg_num 8 pgp_num 8 last_change 87 owner 18446744073709551615 flags hashpspool stripe_width 0 application rgwpool 5 'default.rgw.meta' replicated size 3 min_size 2 crush_rule 0 object_hash rjenkins pg_num 8 pgp_num 8 last_change 89 owner 18446744073709551615 flags hashpspool stripe_width 0 application rgwpool 6 'default.rgw.log' replicated size 3 min_size 2 crush_rule 0 object_hash rjenkins pg_num 8 pgp_num 8 last_change 91 owner 18446744073709551615 flags hashpspool stripe_width 0 application rgwpool 7 'cephfs-metadatpool' replicated size 3 min_size 2 crush_rule 0 object_hash rjenkins pg_num 64 pgp_num 64 last_change 99 flags hashpspool stripe_width 0 application cephfspool 8 'cephfs-datapool' replicated size 3 min_size 2 crush_rule 0 object_hash rjenkins pg_num 128 pgp_num 128 last_change 99 flags hashpspool stripe_width 0 application cephfspool 9 'reppool' replicated size 3 min_size 2 crush_rule 0 object_hash rjenkins pg_num 32 pgp_num 32 last_change 126 flags hashpspool stripe_width 0pool 10 'erasurepool' erasure size 3 min_size 2 crush_rule 1 object_hash rjenkins pg_num 32 pgp_num 32 last_change 130 flags hashpspool stripe_width 8192[cephadm@ceph-admin ~]$提示：后面接detail表示列出存储池的详细信息；
获取存储池的统计数据：ceph osd pool stats [pool-name]
[cephadm@ceph-admin ~]$ ceph osd pool stats reppoolpool reppool id 9nothing is going on[cephadm@ceph-admin ~]$ ceph osd pool statspool testpool id 1nothing is going onpool rbdpool id 2nothing is going onpool .rgw.root id 3nothing is going onpool default.rgw.control id 4nothing is going onpool default.rgw.meta id 5nothing is going onpool default.rgw.log id 6nothing is going onpool cephfs-metadatpool id 7nothing is going onpool cephfs-datapool id 8nothing is going onpool reppool id 9nothing is going onpool erasurepool id 10nothing is going on[cephadm@ceph-admin ~]$