PG相关命令
要检索特定放置组的统计信息，请执行以下操作：
ceph pg {pg-id} query
这里的query其实是一种元数据信息，部分形式如下：
1 {
2 "snap_trimq": "[]",
3 "snap_trimq_len": 0,
4 "state": "active+clean",
5 "epoch": 236,
6 "up": [
7 1,
8 2,
9 0
10 ],
11 "acting": [
12 1,
13 2,
14 0
15 ],
16 "acting_recovery_backfill": [
17 "0",
18 "1",
19 "2"
20 ],
21 "info": {
22 "pgid": "1.0",
23 "last_update": "223'23",
24 "last_complete": "223'23",
25 "log_tail": "0'0",
26 "last_user_version": 23,
27 "last_backfill": "MAX",
28 "purged_snaps": [],
29 "history": {
30 "epoch_created": 2,
31 "epoch_pool_created": 2,
32 "last_epoch_started": 221,
33 "last_interval_started": 220,
34 "last_epoch_clean": 221,
35 "last_interval_clean": 220,
36 "last_epoch_split": 0,
37 "last_epoch_marked_full": 0,
38 "same_up_since": 220,
39 "same_interval_since": 220,
40 "same_primary_since": 212,
41 "last_scrub": "189'21",
42 "last_scrub_stamp": "2020-12-14T06:56:57.181447+0800",
43 "last_deep_scrub": "189'20",
44 "last_deep_scrub_stamp": "2020-12-13T04:09:17.431508+0800",
45 "last_clean_scrub_stamp": "2020-12-14T06:56:57.181447+0800",
46 "prior_readable_until_ub": 0
47 },
48 ...
49 }
View Code
我们可以看到很多理论部分讲过的元数据，比如 up 、acting、info、epoch、peer、interval等。snap_trimq表示快照删除队列。
获取PG Map：
要获取特定放置组的放置组映射，请执行以下操作：
ceph pg map {pg-id}
例如：
ceph pg map 1.6c
Ceph将返回放置组图，放置组和OSD状态：
osdmap e13 pg 1.6c (1.6c) -> up [1,0] acting [1,0]
解释一下，这里表示 pg 1.6c被映射到 编号为 [1,0]的两个OSD上。 Acting 表示Acting Set。