ceph degraded pg

{ "state": "active+degraded",
  "epoch": 11,
  "up": [
        0],
  "acting": [
        0],
  "actingbackfill": [
        "0"],
  "info": { "pgid": "0.2e",
      "last_update": "0'0",
      "last_complete": "0'0",
      "log_tail": "0'0",
      "last_user_version": 0,
      "last_backfill": "MAX",
      "purged_snaps": "[]",
      "history": { "epoch_created": 1,
          "last_epoch_started": 5,
          "last_epoch_clean": 5,
          "last_epoch_split": 0,
          "same_up_since": 4,
          "same_interval_since": 4,
          "same_primary_since": 4,
          "last_scrub": "0'0",
          "last_scrub_stamp": "2014-06-04 22:58:14.854377",
          "last_deep_scrub": "0'0",
          "last_deep_scrub_stamp": "2014-06-04 22:58:14.854377",
          "last_clean_scrub_stamp": "0.000000"},
      "stats": { "version": "0'0",
          "reported_seq": "12",
          "reported_epoch": "11",
          "state": "active+degraded",
          "last_fresh": "2014-06-04 22:58:38.657392",
          "last_change": "2014-06-04 22:58:18.110575",
          "last_active": "2014-06-04 22:58:38.657392",
          "last_clean": "0.000000",
          "last_became_active": "0.000000",
          "last_unstale": "2014-06-04 22:58:38.657392",
          "mapping_epoch": 4,
          "log_start": "0'0",
          "ondisk_log_start": "0'0",
          "created": 1,
          "last_epoch_clean": 5,
          "parent": "0.0",
          "parent_split_bits": 0,
          "last_scrub": "0'0",
          "last_scrub_stamp": "2014-06-04 22:58:14.854377",
          "last_deep_scrub": "0'0",
          "last_deep_scrub_stamp": "2014-06-04 22:58:14.854377",
          "last_clean_scrub_stamp": "0.000000",
          "log_size": 0,
          "ondisk_log_size": 0,
          "stats_invalid": "0",
          "stat_sum": { "num_bytes": 0,
              "num_objects": 0,
              "num_object_clones": 0,
              "num_object_copies": 0,
              "num_objects_missing_on_primary": 0,
              "num_objects_degraded": 0,
              "num_objects_unfound": 0,
              "num_objects_dirty": 0,
              "num_whiteouts": 0,
              "num_read": 0,
              "num_read_kb": 0,
              "num_write": 0,
              "num_write_kb": 0,
              "num_scrub_errors": 0,
              "num_shallow_scrub_errors": 0,
              "num_deep_scrub_errors": 0,
              "num_objects_recovered": 0,
              "num_bytes_recovered": 0,
              "num_keys_recovered": 0,
              "num_objects_omap": 0,
              "num_objects_hit_set_archive": 0},
          "stat_cat_sum": {},
          "up": [
                0],
          "acting": [
                0],
          "up_primary": 0,
          "acting_primary": 0},
      "empty": 1,
      "dne": 0,
      "incomplete": 0,
      "last_epoch_started": 5,
      "hit_set_history": { "current_last_update": "0'0",
          "current_last_stamp": "0.000000",
          "current_info": { "begin": "0.000000",
              "end": "0.000000",
              "version": "0'0"},
          "history": []}},
  "peer_info": [],
  "recovery_state": [
        { "name": "Started\/Primary\/Active",
          "enter_time": "2014-06-04 22:58:18.054799",
          "might_have_unfound": [],
          "recovery_progress": { "backfill_targets": [],
              "waiting_on_backfill": [],
              "last_backfill_started": "0\/\/0\/\/-1",
              "backfill_info": { "begin": "0\/\/0\/\/-1",
                  "end": "0\/\/0\/\/-1",
                  "objects": []},
              "peer_backfill_info": [],
              "backfills_in_flight": [],
              "recovering": [],
              "pg_backend": { "pull_from_peer": [],
                  "pushing": []}},
          "scrub": { "scrubber.epoch_start": "0",
              "scrubber.active": 0,
              "scrubber.block_writes": 0,
              "scrubber.finalizing": 0,
              "scrubber.waiting_on": 0,
              "scrubber.waiting_on_whom": []}},
        { "name": "Started",
          "enter_time": "2014-06-04 22:58:14.854510"}],