What is Ceph scrubbing?

What is Ceph scrubbing?

CEPH scrubbing. CEPH is using two type of scrubbing processing to check storage health. The scrubbing process is usually execute on daily basis. normal scrubbing – catch the OSD bugs or filesystem errors.

How do you clean Ceph?

Identify the nodes where ceph daemons are running. Wait till all the ceph daemons are destroyed on each node….The job performs the following action on each node based on the user confirmation:

1. cleanup the cluster namespace on the dataDirHostPath.
2. Delete all the ceph monitor directories on the dataDirHostPath.

What is PG in Ceph?

Placement groups (PGs) are an internal implementation detail of how Ceph distributes data. You may enable pg-autoscaling to allow the cluster to make recommendations or automatically adjust the numbers of PGs ( pgp_num ) for each pool based on expected cluster and pool utilization.

How do I restart my OSD Ceph?

To start, stop, or restart all the Ceph daemons, execute the following commands from the local node running the Ceph daemons, and as root :

1. Start All Ceph Daemons # systemctl start ceph.target.
2. Stop All Ceph Daemons # systemctl stop ceph.target.
3. Restart All Ceph Daemons # systemctl restart ceph.target.

How do I clean up OSD in CEPH?

Removing the OSD

1. Let the cluster forget the OSD first. This step removes the OSD from the CRUSH map, removes its authentication key.
2. Navigate to the host where you keep the master copy of the cluster’s ceph.
3. Remove the OSD entry from your ceph.
4. From the host where you keep the master copy of the cluster’s ceph.

How do I delete a rook Ceph cluster?

Delete the CephCluster CRD

1. Delete the directory /var/lib/rook (or the path specified by the dataDirHostPath ) on all the nodes.
2. Wipe the data on the drives on all the nodes where OSDs were running in this cluster.

What is PG and PGP?

Messages sorted by: [ date ] [ thread ] [ subject ] [ author ] PG = Placement Group PGP = Placement Group for Placement purpose pg_num = number of placement groups mapped to an OSD When pg_num is increased for any pool, every PG of this pool splits into half, but they all remain mapped to their parent OSD.

How do I remove OSD from Ceph?

How do you reset a Ceph node?

10.3. Rebooting Ceph Storage Nodes

1. Select the first Ceph Storage node to reboot and log into it.
2. Disable Ceph Storage cluster rebalancing temporarily:
3. Reboot the node:
4. Wait until the node boots.
5. Log into the node and check the cluster status:
6. Log out of the node, reboot the next node, and check its status.

How do I check my CEPH OSD status?

To check a cluster’s status, execute the following:

1. ceph status. Or:
2. ceph -s. In interactive mode, type status and press Enter.
3. ceph> status. Ceph will print the cluster status. For example, a tiny Ceph demonstration cluster with one of each service may print the following:

How do I check my ceph OSD status?

How do I remove a host from ceph cluster?

Removing Hosts

1. ceph orch host drain ** The ‘_no_schedule’ label will be applied to the host.
2. ceph orch osd rm status. see Remove an OSD for more details about osd removal.
3. ceph orch ps Once all daemons are removed you can remove the host with the following:
4. ceph orch host rm Offline host removal.

What is CephFS scrub?

This document is for a development version of Ceph. CephFS provides the cluster admin (operator) to check consistency of a file system via a set of scrub commands. Scrub can be classified into two parts:

Why are my Ceph health alerts not working on my cluster?

This issue started after the cluster performed a deep cleaning process. The alert was one of the pg on the cluster was getting active+clean+inconsistent, this is the process I went through to resolve. Run the standard command for ceph health detail and lets see the error message, and determine what page is triggering an alert on our cluster.

How long does it take for Ceph to clean the system?

this will countdown your errors. the next thing to do is wait for ceph to do its thing, it should also do a scrub and deep scrub of all the files now which will leave you with a clean health. This can happen within an hour or over night.

What happens to my data if my Ceph server fails?

The data can be replicated based on your needs so any single disk or server failure does not effect your data, or the availability of the storage cluster. We monitor our Ceph cluster health by using Nagios with Ceph plugins and recently had an alert that needed to be resolved. This issue started after the cluster performed a deep cleaning process.