Ceph » RADOS

Question:
- ceph daemon osd.x status

# ceph daemon osd.0 status
{
    "cluster_fsid": "6bcb6246-8477-4831-ad89-ce37fd398ef7",
    "osd_fsid": "cdf2eea5-936a-4086-8192-f49aa8225866",
    "whoami": 0,
    "state": "active",
    "maps": "[1263~525]", //1263 + 525 -1 = 1787
    "cluster_osdmap_trim_lower_bound": 1263,
    "num_pgs": 128
}

- When osd status is displayed, only superblock.maps (begin ~ len) can be seen.
- This requires analysts to process the maps data to obtain the oldest_map and newest_map held by the current osd.
- Moreover, it cannot be simply added. Pay attention to the boundaries。
- This is not very friendly

Desired display effect：

# ceph daemon osd.0 status
{
    "cluster_fsid": "6bcb6246-8477-4831-ad89-ce37fd398ef7",
    "osd_fsid": "cdf2eea5-936a-4086-8192-f49aa8225866",
    "whoami": 0,
    "state": "active",
    "maps": "[1263~531]", // 1263 + 531 - 1 = 1793
    "oldest_map": "1263",
    "newest_map": "1793",
    "cluster_osdmap_trim_lower_bound": 1263,
    "num_pgs": 128
}