Setting and unsetting override options

You can set and unset Ceph options to override Ceph’s default behavior.

Prerequisites

  • A running IBM Storage Ceph cluster.

  • Root-level access to the node.

Procedure

  1. To override Ceph’s default behavior, use the ceph osd set command and the behavior you wish to override:

    Syntax 

    ceph osd set FLAG

    Once you set the behavior, ceph health will reflect the override(s) that you have set for the cluster.

    Example 

    [ceph: root@host01 /]# ceph osd set noout

  2. To cease overriding Ceph’s default behavior, use the ceph osd unset command and the override you wish to cease.

    Syntax 

    ceph osd unset FLAG

    Example 

    [ceph: root@host01 /]# ceph osd unset noout
Flag Description

noin

Prevents OSDs from being treated as in the cluster.

noout

Prevents OSDs from being treated as out of the cluster.

noup

Prevents OSDs from being treated as up and running.

nodown

Prevents OSDs from being treated as down.

full

Makes a cluster appear to have reached its full_ratio, and thereby prevents write operations.

pause

Ceph stops processing read and write operations, but will not affect OSD in, out, up or down statuses.

nobackfill

Ceph prevents new backfill operations.

norebalance

Ceph prevents new rebalancing operations.

norecover

Ceph prevents new recovery operations.

noscrub

Ceph prevents new scrubbing operations.

nodeep-scrub

Ceph prevents new deep scrubbing operations.

notieragent

Ceph disables the process that is looking for cold/dirty objects to flush and evict.