查看object，pg，对应osd的分布

 1.查看object 所对应的osd分布

在资源池rbd  中的对象数据 rbd\udata.10f6238e1f29.00000000000966f9__head_32EED064__0的osd映射关系：

ceph osd map rbd rbd\udata.10f6238e1f29.00000000000966f9__head_32EED064__0

osdmap e11557 pool 'rbd' (0) object 'rbdudata.10f6238e1f29.00000000000966f9__head_32EED064__0' -> pg 0.38d1ed2a (0.52a) -> up ([6,0], p6) acting ([6,0], p6)

e11227是Epoch：osdmap的版本号，单调递增，osdmap每变化一次加1 ；对象rbd\udata.10f6238e1f29.00000000000966f9__head_32EED064__0属于PG 0.52a ；其数据分别分布在osd.6，osd.0 上。

2.查看数据存储的物理位置：

1、`ceph osd tree` 查看osd所在的节点
2、`ssh ceph-nodeN`，进入该节点 #osd.5所在的node节点
3、`df -h | grep -i ceph-5`找出该osd.5的物理存储位置 ,ceph-5是指osd.5
4、`cd /var/lib/ceph/osd/ceph-5/current`进入osd.5所在的物理存储文件夹
5、`ls -l |grep -i 6.31`找出和PG（6.31）相关的文件夹
6、`cd 6.31_head`进入该PG文件夹
7、`ls -l `就可以看到我们存储的testobject数据的详细信息

3.查看pg的分布以及信息

ceph pg 0.52a query
{
"state": "active+clean",
"snap_trimq": "[]",
"epoch": 11557,
"up": [
6,
0
],
"acting": [
6,
0
],
"actingbackfill": [
"0",
"6"
],
"info": {
"pgid": "0.52a",
"last_update": "11557'769236",
"last_complete": "11557'769236",
"log_tail": "10519'766233",
"last_user_version": 769236,
"last_backfill": "MAX",
"last_backfill_bitwise": 1,
"purged_snaps": "[1~3]",
"history": {
"epoch_created": 380,
"last_epoch_started": 11032,
"last_epoch_clean": 11032,
"last_epoch_split": 0,
"last_epoch_marked_full": 0,
"same_up_since": 11030,
"same_interval_since": 11031,
"same_primary_since": 10941,
"last_scrub": "11557'769194",
"last_scrub_stamp": "2017-09-20 10:25:24.204289",
"last_deep_scrub": "10084'764033",
"last_deep_scrub_stamp": "2017-09-05 05:06:18.409894",
"last_clean_scrub_stamp": "2017-09-20 10:25:24.204289"
},
"stats": {
"version": "11557'769236",
"reported_seq": "4213401",
"reported_epoch": "11557",
"state": "active+clean",
"last_fresh": "2017-09-20 23:13:23.953428",
"last_change": "2017-09-20 10:25:24.204313",
"last_active": "2017-09-20 23:13:23.953428",
"last_peered": "2017-09-20 23:13:23.953428",
"last_clean": "2017-09-20 23:13:23.953428",
"last_became_active": "2017-09-14 08:02:34.741765",
"last_became_peered": "2017-09-14 08:02:34.741765",
"last_unstale": "2017-09-20 23:13:23.953428",
"last_undegraded": "2017-09-20 23:13:23.953428",
"last_fullsized": "2017-09-20 23:13:23.953428",
"mapping_epoch": 11030,
"log_start": "10519'766233",
"ondisk_log_start": "10519'766233",
"created": 380,
"last_epoch_clean": 11032,
"parent": "0.0",
"parent_split_bits": 11,
"last_scrub": "11557'769194",
"last_scrub_stamp": "2017-09-20 10:25:24.204289",
"last_deep_scrub": "10084'764033",
"last_deep_scrub_stamp": "2017-09-05 05:06:18.409894",
"last_clean_scrub_stamp": "2017-09-20 10:25:24.204289",
"log_size": 3003,
"ondisk_log_size": 3003,
"stats_invalid": false,
"dirty_stats_invalid": false,
"omap_stats_invalid": false,
"hitset_stats_invalid": false,
"hitset_bytes_stats_invalid": false,
"pin_stats_invalid": false,
"stat_sum": {
"num_bytes": 4118806528,
"num_objects": 982,
"num_object_clones": 0,
"num_object_copies": 1964,
"num_objects_missing_on_primary": 0,
"num_objects_missing": 0,
"num_objects_degraded": 0,
"num_objects_misplaced": 0,
"num_objects_unfound": 0,
"num_objects_dirty": 982,
"num_whiteouts": 0,
"num_read": 5644898,
"num_read_kb": 447840096,
"num_write": 1407758,
"num_write_kb": 141547192,
"num_scrub_errors": 0,
"num_shallow_scrub_errors": 0,
"num_deep_scrub_errors": 0,
"num_objects_recovered": 11459,
"num_bytes_recovered": 47822565376,
"num_keys_recovered": 0,
"num_objects_omap": 0,
"num_objects_hit_set_archive": 0,
"num_bytes_hit_set_archive": 0,
"num_flush": 0,
"num_flush_kb": 0,
"num_evict": 0,
"num_evict_kb": 0,
"num_promote": 0,
"num_flush_mode_high": 0,
"num_flush_mode_low": 0,
"num_evict_mode_some": 0,
"num_evict_mode_full": 0,
"num_objects_pinned": 0
},
"up": [
6,
0
],
"acting": [
6,
0
],
"blocked_by": [],
"up_primary": 6,
"acting_primary": 6
},
"empty": 0,
"dne": 0,
"incomplete": 0,
"last_epoch_started": 11032,
"hit_set_history": {
"current_last_update": "0'0",
"history": []
}
},
"peer_info": [
{
"peer": "0",
"pgid": "0.52a",
"last_update": "11557'769236",
"last_complete": "11557'769236",
"log_tail": "10185'764733",
"last_user_version": 767756,
"last_backfill": "MAX",
"last_backfill_bitwise": 1,
"purged_snaps": "[1~3]",
"history": {
"epoch_created": 380,
"last_epoch_started": 11032,
"last_epoch_clean": 11032,
"last_epoch_split": 0,
"last_epoch_marked_full": 0,
"same_up_since": 11030,
"same_interval_since": 11031,
"same_primary_since": 10941,
"last_scrub": "11557'769194",
"last_scrub_stamp": "2017-09-20 10:25:24.204289",
"last_deep_scrub": "10084'764033",
"last_deep_scrub_stamp": "2017-09-05 05:06:18.409894",
"last_clean_scrub_stamp": "2017-09-20 10:25:24.204289"
},
"stats": {
"version": "11017'767755",
"reported_seq": "3992851",
"reported_epoch": "11017",
"state": "active+clean",
"last_fresh": "2017-09-14 07:09:33.085381",
"last_change": "2017-09-14 01:19:28.001489",
"last_active": "2017-09-14 07:09:33.085381",
"last_peered": "2017-09-14 07:09:33.085381",
"last_clean": "2017-09-14 07:09:33.085381",
"last_became_active": "2017-09-13 17:59:23.388488",
"last_became_peered": "2017-09-13 17:59:23.388488",
"last_unstale": "2017-09-14 07:09:33.085381",
"last_undegraded": "2017-09-14 07:09:33.085381",
"last_fullsized": "2017-09-14 07:09:33.085381",
"mapping_epoch": 11030,
"log_start": "10185'764733",
"ondisk_log_start": "10185'764733",
"created": 380,
"last_epoch_clean": 10962,
"parent": "0.0",
"parent_split_bits": 11,
"last_scrub": "11002'767700",
"last_scrub_stamp": "2017-09-14 01:19:28.001462",
"last_deep_scrub": "10084'764033",
"last_deep_scrub_stamp": "2017-09-05 05:06:18.409894",
"last_clean_scrub_stamp": "2017-09-14 01:19:28.001462",
"log_size": 3022,
"ondisk_log_size": 3022,
"stats_invalid": false,
"dirty_stats_invalid": false,
"omap_stats_invalid": false,
"hitset_stats_invalid": false,
"hitset_bytes_stats_invalid": false,
"pin_stats_invalid": false,
"stat_sum": {
"num_bytes": 4118806528,
"num_objects": 982,
"num_object_clones": 0,
"num_object_copies": 1964,
"num_objects_missing_on_primary": 0,
"num_objects_missing": 0,
"num_objects_degraded": 0,
"num_objects_misplaced": 0,
"num_objects_unfound": 0,
"num_objects_dirty": 982,
"num_whiteouts": 0,
"num_read": 5246684,
"num_read_kb": 410564392,
"num_write": 1404798,
"num_write_kb": 139100480,
"num_scrub_errors": 0,
"num_shallow_scrub_errors": 0,
"num_deep_scrub_errors": 0,
"num_objects_recovered": 11459,
"num_bytes_recovered": 47822565376,
"num_keys_recovered": 0,
"num_objects_omap": 0,
"num_objects_hit_set_archive": 0,
"num_bytes_hit_set_archive": 0,
"num_flush": 0,
"num_flush_kb": 0,
"num_evict": 0,
"num_evict_kb": 0,
"num_promote": 0,
"num_flush_mode_high": 0,
"num_flush_mode_low": 0,
"num_evict_mode_some": 0,
"num_evict_mode_full": 0,
"num_objects_pinned": 0
},
"up": [
6,
0
],
"acting": [
6,
0
],
"blocked_by": [],
"up_primary": 6,
"acting_primary": 6
},
"empty": 0,
"dne": 0,
"incomplete": 0,
"last_epoch_started": 11032,
"hit_set_history": {
"current_last_update": "0'0",
"history": []
}
}
],
"recovery_state": [
{
"name": "Started\/Primary\/Active",
"enter_time": "2017-09-14 08:02:34.738527",
"might_have_unfound": [],
"recovery_progress": {
"backfill_targets": [],
"waiting_on_backfill": [],
"last_backfill_started": "MIN",
"backfill_info": {
"begin": "MIN",
"end": "MIN",
"objects": []
},
"peer_backfill_info": [],
"backfills_in_flight": [],
"recovering": [],
"pg_backend": {
"pull_from_peer": [],
"pushing": []
}
},
"scrub": {
"scrubber.epoch_start": "11031",
"scrubber.active": 0,
"scrubber.state": "INACTIVE",
"scrubber.start": "MIN",
"scrubber.end": "MIN",
"scrubber.subset_last_update": "0'0",
"scrubber.deep": false,
"scrubber.seed": 0,
"scrubber.waiting_on": 0,
"scrubber.waiting_on_whom": []
}
},
{
"name": "Started",
"enter_time": "2017-09-14 08:02:33.737331"
}
],
"agent_state": {}
}

详细解释参考http://www.cnblogs.com/chenxianpao/p/5565286.html