Ceph is an open source software platform designed to provide highly scalable object, block and file-based storage from a single distributed computer cluster. Ceph's main goals are to be completely distributed without a single point of failure, scalable to the exabyte level, and freely-available. Applications Manager's Ceph storage monitors the performance and helps you maintain the overall health of your distributed Ceph cluster, ensures the availability of OSD nodes, proactively tracks the status of Placement Groups and storage availability.
Ceph Storage Versions Supported: v0.66 and above (We use ceph status command and get the output in Json format.Returning the output in Json is supported from Ceph release v0.66)
Prerequisites for monitoring Ceph Storage Clusters: To collect performance stats of Ceph Storage Monitor a user should be given read privileage to ceph.keyring file. Read More.
Attributes Monitored: Refer Ceph Storage Parameters to know more about the attributes monitored.
To create a Ceph Storage monitor, follow the steps given below:
Go to the Monitors Category View by clicking the Monitors tab. Click on Ceph Storage under the Services Table. Displayed is the Ceph Storage bulk configuration view distributed into three tabs:
Click on the monitor name to see all the server details listed under the following tabs:
|PGS (Placement groups)||The number of Placement Group.|
|Active PGs||The total number of Active Placement Groups. (Ceph processes requests to the placement group.)|
|Active+Clean PGs||The total number of Active and Clean Placement Groups.
|Active+Remapped PGs||The total number of Active and Remapped Placement Groups.
|Active+Degraded PGs||The total number of Active and Degraded Placement Groups.
|Down+Remapped+Peering||The total number of Down, Remapped and Peering Placement Groups.
|Active+Clean+Scrubbing+Deep||The total number of Active, Clean, Scrubbing and Deep Placement Groups.
|Down||The number of replica placement groups where the necessary data is down, so the placement group is offline.|
|Degraded||The number of placement groups, that has not replicated some objects in the placement group the correct number of times.|
|Peering||The number of placement groups undergoing the peering process.|
|Incomplete||The number of placement groups in Incomplete state i.e PGs with missing information about writes that may have occurred, or does not have any healthy copies.|
|Stale||The number of placement groups in an unknown state - the monitors have not received an update for it since the placement group mapping changed.|
|OSDS||Number of OSDS Present.|
|OSDUP||Number of OSDs up and running.|
|OSDIN||Number of OSDs in the cluster.|
|OSDOUT||Number of OSDs out of the cluster.|
|OSDs In and Down||If an OSD is down and in, there is a problem and the cluster will not be in a healthy state.This attribute will capture the number os OSDs In and Down|
|FULL||Is the OSD Full.|
|NEARFULL||Is the OSD reaching near full.|
|Monitor Name||The name of the monitor in the cluster.|
|Severity||The health severity message of the monitor.|
|Monitor Health Summary|
|Monitor Name||Name of the monitor.|
|Total (GB)||The total disk memory in GB.|
|Used (GB)||The total used memory in GB.|
|Available(GB)||The available free memory in GB.|
|Available In (%)||The percentage of available free memory.|
|Last Updated||The last time of Monitor status updated.|
|Severity||The health severity of the monitor.|
|Rank||Rank of the Ceph monitor in the Cluster. Ranks are (re)calculated whenever you add or remove a monitor (Lower the value, higher the rank). Ceph monitor with lowest value will be the lead or admin, clients will try to connect to the lead first and when lead is down, clients connect to the next rank monitor.|
|Monitor address||The address required for monitors to discover each other using the monitor map.|
|Read Bytes||The rate of bytes read per sec.|
|Write Bytes||The rate of bytes written per sec.|
|Data Size||The total storage data size in GB.|
|Total Bytes||The total storage space available in GB.|
|Available||The total free storage space available in GB.|
|Used||The total amount of used storage space in GB.|
|Available %||The percentage of free storage space.|
|Used %||The percentage of used storage space.|