1.说明
1.1介绍
pool是ceph存储数据时的逻辑分区，它起到namespace的作用。其他分布式存储系统，比如Mogilefs、Couchbase、Swift都有pool的概念，只是叫法不同。
每个pool包含一定数量的PG，PG里的对象被映射到不同的OSD上，因此pool是分布到整个集群的。
2. 常用操作
2.1 查看pool数量
$ ceph osd lspools
1 rbd,2 test_data,3 test_metadata,5 test,6 benmark_test,7 .rgw.root,8 default.rgw.control,9 default.rgw.meta,10 default.rgw.log,11 default.rgw.buckets.index,12 web-services,13 test_pool,15 cephfs_data,16 cephfs_metadata,
2.2 创建pool
$ ceph osd pool create test_lihang 100 #这里的100指的是PG组
pool 'test_lihang' created
2.3 为pool配置配额
$ ceph osd pool set-quota test_lihang max_objects 10000
set-quota max_objects = 10000 for pool test_lihang
2.4 删除pool
$ ceph osd pool delete test_lihang test_lihang --yes-i-really-really-mean-it #pool的名字需要重复两次
pool 'test_lihang' removed
2.5 查看pool详细信息
$ rados df
POOL_NAME USED OBJECTS CLONES COPIES MISSING_ON_PRIMARY UNFOUND DEGRADED RD_OPS RD WR_OPS WR
.rgw.root 1113 4 0 12 0 0 0 1578 1052k 4 4096
benmark_test 8131M 1975366 0 5926098 0 0 0 0 0 0 0
cephfs_data 0 0 0 0 0 0 0 0 0 0 0
cephfs_metadata 2246 21 0 63 0 0 0 0 0 42 8192
default.rgw.buckets.index 0 1 0 3 0 0 0 0 0 7 0
default.rgw.control 0 8 0 24 0 0 0 0 0 0 0
default.rgw.log 0 191 0 573 0 0 0 4706893 4596M 3134451 0
default.rgw.meta 1014 6 0 18 0 0 0 107 100352 47 11264
rbd 29047M 19619 176 58857 0 0 0 1014831 835M 354490 11459M
test 3606 10 0 30 0 0 0 34 31744 0 0
test_data 130G 292511 0 877533 0 0 0 44647 5692k 59192695 56594M
test_lihang 0 0 0 0 0 0 0 0 0 0 0
test_metadata 42036k 164 0 492 0 0 0 25567 491M 177927 2779M
test_pool 305G 100678 0 302034 0 0 0 3966 709M 337549 305G
web-services 36 1 0 3 0 0 0 0 0 1 1024
total_objects 2388580
total_used 1915G
total_avail 154T
total_space 156T
2.6 给一个pool创建快照
$ ceph osd pool delete test_lihang test_lihang --yes-i-really-really-mean-it #pool的名字需要重复两次
pool 'test_lihang' removed
2.7 创建pool快照
$ ceph osd pool mksnap test_lihang date-snap
created pool test_lihang snap date-snap
2.8 删除pool快照
$ ceph osd pool rmsnap test_lihang date-snap
removed pool test_lihang snap date-snap
2.9 查看pool池pg数量
$ ceph osd pool get test_lihang pg_num
pg_num: 100
2.10 设置pool池副本数
$ ceph osd pool set test_lihang size 3
set pool 18 size to 3
2.11 查看pool池副本数
$ ceph osd pool get test_lihang size
size: 3
2.12 设置pool池写最小副本
#设置pool池写操作最小副本为2
$ ceph osd pool set test_lihang min_size 2
set pool 18 min_size to 2
2.13 查看集群所有pool副本尺寸
$ ceph osd dump | grep 'replicated size'
pool 1 'rbd' replicated size 3 min_size 2 crush_rule 0 object_hash rjenkins pg_num 2048 pgp_num 2048 last_change 5493 lfor 0/187 flags hashpspool stripe_width 0 application rbd
pool 2 'test_data' replicated size 3 min_size 2 crush_rule 0 object_hash rjenkins pg_num 512 pgp_num 512 last_change 1575 lfor 0/227 flags hashpspool stripe_width 0 application cephfs
2.14 获取pool的pg数量
$ ceph osd dump | grep 'replicated size'
pool 1 'rbd' replicated size 3 min_size 2 crush_rule 0 object_hash rjenkins pg_num 2048 pgp_num 2048 last_change 5493 lfor 0/187 flags hashpspool stripe_width 0 application rbd
pool 2 'test_data' replicated size 3 min_size 2 crush_rule 0 object_hash rjenkins pg_num 512 pgp_num 512 last_change 1575 lfor 0/227 flags hashpspool stripe_width 0 application cephfs
2.15 设置pool的pg数量
$ ceph osd pool set test_lihang pg_num 100
specified pg_num 100 <= current 100
$ ceph osd pool get test_lihang pg_num
pg_num: 100
2.16 设置pool的pgp数量
$ ceph osd pool set test_lihang pgp_num 100
set pool 18 pgp_num to 100
$ ceph osd pool get test_lihang pgp_num
pgp_num: 100
2.17 设置存储池类型
$ ceph osd pool application enable rbd rbd
enabled application 'rbd' on pool 'rbd'
2.18 设置存储池crush rule
$ ceph osd pool set <poolname> crush_ruleset <ruleset>
ceph osd pool set ssd crush_ruleset 4
2.19 获取存储池crush rule
$ ceph osd pool get <poolname> crush_rule
ceph osd pool get test_pool crush_rule
crush_rule: replicated_rule
2.20 获取pool->pg->osd 关系
$ ceph osd getmap -o om
$ ceph osd getcrushmap -o cm
$ osdmaptool om --import-crush cm --test-map-pgs-dump --pool {pool_id}
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