我使用推荐值（使用文档中的公式）配置Ceph。我有3个OSD，我的配置（我已经放在监控节点和所有3个OSD上）包括：
osd pool default size = 2
osd pool default min size = 1
osd pool default pg num = 150
osd pool default pgp num = 150
当我运行ceph status时，我得到：
health HEALTH_WARN
too many PGs per OSD (1042 > max 300)
这有两个原因令人困惑。首先，因为推荐的配方不满足Ceph。其次，最令人费解的是，当我的配置为150时，它表示每个OSD有1042个PG。
我做错了什么？
答案 0 :(得分：9)
在设置PG计数之前，您需要了解3件事。
<强> 1。 OSD数量
ceph osd ls
Sample Output:
0
1
2
Here Total number of osd is three.
<强> 2。池数
ceph osd pool ls或rados lspools
Sample Output:
rbd
images
vms
volumes
backups
Here Total number of pool is five.
第3。复制计数
ceph osd dump | grep repli
Sample Output:
pool 0 'rbd' replicated size 2 min_size 2 crush_ruleset 0 object_hash rjenkins pg_num 64 pgp_num 64 last_change 38 flags hashpspool stripe_width 0
pool 1 'images' replicated size 2 min_size 2 crush_ruleset 1 object_hash rjenkins pg_num 30 pgp_num 30 last_change 40 flags hashpspool stripe_width 0
pool 2 'vms' replicated size 2 min_size 2 crush_ruleset 1 object_hash rjenkins pg_num 30 pgp_num 30 last_change 42 flags hashpspool stripe_width 0
pool 3 'volumes' replicated size 2 min_size 2 crush_ruleset 1 object_hash rjenkins pg_num 30 pgp_num 30 last_change 36 flags hashpspool stripe_width 0
pool 4 'backups' replicated size 2 min_size 2 crush_ruleset 1 object_hash rjenkins pg_num 30 pgp_num 30 last_change 44 flags hashpspool stripe_width 0
You can see each pool has replication count two.
现在让我们进入计算
Total PGs = (Total_number_of_OSD * 100) / max_replication_count
This result must be rounded up to the nearest power of 2.
示例：
OSD的数量：3
没有复制计数：2
总PGs =（3 * 100）/ 2 = 150.最近的150到2的功率是256.
因此最大推荐PG为256
您可以为每个游泳池设置PG
Total PGs = ((Total_number_of_OSD * 100) / max_replication_count) / pool count
This result must be rounded up to the nearest power of 2.
示例：
OSD的数量：3
没有复制计数：2
没有游泳池：5
总PGs =（（3 * 100）/ 2）/ 5 = 150/5 = 30。最近的30到2的力是32.
因此每个游泳池的总数为32。
2^0 1
2^1 2
2^2 4
2^3 8
2^4 16
2^5 32
2^6 64
2^7 128
2^8 256
2^9 512
2^10 1024
ceph osd pool create <pool-name> <pg-number> <pgp-number> - To create a new pool
ceph osd pool get <pool-name> <pg_num> - To get number of PG in a pool
ceph osd pool get <pool-name> <pgp_num> - To get number of PGP in a pool
ceph osd pool set <pool-name> <pg_num number> - To increase number of PG in a pool
ceph osd pool set <pool-name> <pgp_num number> - To increase number of PGP in a poo
*usually pg and pgp number is same
答案 1 :(得分：0)
我如何在12.2.4发光中修复它：
每个OSD太多PG（380>最多200）可能会导致许多阻止请求。
首先你需要设置：
[global]
mon_max_pg_per_osd = 800 # < depends on you amount of PGs
osd max pg per osd hard ratio = 10 # < default is 2, try to set at least 5. It will be
mon allow pool delete = true # without it you can't remove a pool
然后逐个重启所有MON和OSD。
检查值：
ceph --admin-daemon /var/run/ceph/ceph-mon.ceph2.asok config get mon_max_pg_per_osd
ceph --admin-daemon /var/run/ceph/ceph-osd.3.asok config get osd_max_pg_per_osd_hard_ratio
现在看这里：
rados lspools
ceph osd pool get .users.email pg_num
在我的情况下，默认情况下pg_num是128或类似的东西（我的群集是4岁，很多升级都有很多变化）。你可以这样减少它。
小心：
ceph osd pool create .users.email.new 8
rados cppool .users.email default.rgw.lc.new
ceph osd pool delete .users.email .users.email --yes-i-really-really-mean-it
ceph osd pool rename .users.email.new .users.email
ceph osd pool application enable .users.email rgw
如果还不够，请尝试找到另一个可以切割的游泳池。