Mirantis Container Cloud (MCC) becomes part of Mirantis OpenStack for Kubernetes (MOSK)!

Starting with MOSK 25.2, the MOSK documentation set will cover all product layers, including MOSK management (formerly MCC). This means everything you need will be in one place. The separate MCC documentation site will be retired, so please update your bookmarks for continued easy access to the latest content.

Ceph¶

This section describes the alerts for the Ceph cluster.

CephClusterHealthWarning¶

Severity	Warning
Summary	Ceph cluster health is `WARNING`.
Description	The Ceph cluster is in the `WARNING` state. For details, run ceph -s.

CephClusterHealthCritical¶

Severity	Critical
Summary	Ceph cluster health is `CRITICAL`.
Description	The Ceph cluster is in the `CRITICAL` state. For details, run ceph -s.

CephClusterTargetDown¶

Severity	Critical
Summary	Ceph cluster Prometheus target is down.
Description	Prometheus fails to scrape metrics from the `{{ $labels.pod }}` Pod on the `{{ $labels.node }}` node.

CephDaemonSlowOps¶

Available MCC 2.24.0 (Cluster release 14.0.0)

Severity	Warning
Summary	`{{ $labels.ceph_daemon }}` operations are slow.
Description	`{{ $labels.ceph_daemon }}` operations take too long to process on the Ceph cluster (complaint time exceeded).

CephMonClockSkew¶

Available MCC 2.24.0 (Cluster release 14.0.0)

Severity	Warning
Summary	Ceph Monitor clock skew detected.
Description	Ceph Monitor clock drift exceeds configured threshold on the Ceph cluster.

CephMonQuorumAtRisk¶

Severity	Major
Summary	Ceph cluster quorum at risk.
Description	The Ceph Monitors quorum on the Ceph cluster is low.

CephOSDDown¶

Removed in MCC 2.25.0 (Cluster releases 17.0.0 and 16.0.0)

Severity	Critical
Summary	Ceph OSDs are down.
Description	`{{ $value }}` Ceph OSDs on the `{{ $labels.rook_cluster }}` cluster are down. For details, run ceph osd tree.

CephOSDFlapping¶

Available MCC 2.24.0 (Cluster release 14.0.0)

Severity	Warning
Summary	Ceph OSDs flap due to network issues.
Description	The Ceph OSD `{{ $labels.ceph_daemon }}` on the Ceph cluster cluster changed between up and down state `{{ $value \| humanize }}` times for 5 minutes.

CephOSDDiskNotResponding¶

Severity	Critical
Summary	Disk not responding.
Description	The `{{ $labels.device }}` disk device is not responding to `{{ $labels.ceph_daemon }}` on the `{{ $labels.node }}` node of the Ceph cluster.

CephOSDDiskUnavailable¶

Severity	Critical
Summary	Disk not accessible.
Description	The `{{ $labels.device }}` disk device is not accessible by `{{ $labels.ceph_daemon }}` on the `{{ $labels.node }}` node of the Ceph cluster.

CephOSDSlowClusterNetwork¶

Available MCC 2.24.0 (Cluster release 14.0.0)

Severity	Warning
Summary	Cluster network slows down Ceph OSD heartbeats.
Description	Ceph OSD heartbeats on the cluster network (backend) of the cluster are slow.

CephOSDSlowPublicNetwork¶

Available MCC 2.24.0 (Cluster release 14.0.0)

Severity	Warning
Summary	Public network slows down Ceph OSD heartbeats.
Description	Ceph OSD heartbeats on the public network (front end) are running slow.

CephClusterFullWarning¶

Severity	Warning
Summary	Ceph cluster is nearly full.
Description	The Ceph cluster utilization has crossed 85%. Expansion is required.

CephClusterFullCritical¶

Severity	Critical
Summary	Ceph cluster is full.
Description	The Ceph cluster utilization has crossed 95% and needs immediate expansion.

CephOSDPgNumTooHighWarning¶

Severity	Warning
Summary	Ceph OSDs have more than 200 PGs.
Description	Some Ceph OSDs contain more than 200 Placement Groups. This may have a negative impact on the cluster performance. For details, run ceph pg dump.

CephOSDPgNumTooHighCritical¶

Severity	Critical
Summary	Ceph OSDs have more than 300 PGs.
Description	Some Ceph OSDs contain more than 300 Placement Groups. This may have a negative impact on the cluster performance. For details, run ceph pg dump.

CephMonHighNumberOfLeaderChanges¶

Severity	Major
Summary	Ceph cluster has too many leader changes.
Description	The Ceph Monitor `{{ $labels.ceph_daemon }}` on the Ceph cluster has detected `{{ $value }}` leader changes per minute.

CephOSDNodeDown¶

Since MCC 2.25.0 (17.0.0 and 16.0.0) to replace CephNodeDown

Severity	Critical
Summary	Ceph node `{{ $labels.node }}` went down.
Description	The Ceph OSD node `{{ $labels.node }}` of the Ceph cluster went down and requires immediate verification.

CephNodeDown¶

“Renamed to CephOSDNodeDown in MCC 2.25.0 (17.0.0 and 16.0.0)

Severity	Critical
Summary	Ceph node `{{ $labels.node }}` went down.
Description	The Ceph node `{{ $labels.node }}` of the `{{ $labels.rook_cluster }}` cluster went down and requires immediate verification.

CephOSDVersionMismatch¶

Severity	Warning
Summary	Multiple versions of Ceph OSDs running.
Description	`{{ $value }}` different versions of Ceph OSD daemons are running on the cluster.

CephMonVersionMismatch¶

Severity	Warning
Summary	Multiple versions of Ceph Monitors running.
Description	`{{ $value }}` different versions of Ceph Monitors are running on the Ceph cluster.

CephPGInconsistent¶

Severity	Warning
Summary	Too many inconsistent Ceph PGs.
Description	The Ceph cluster detects inconsistencies in one or more replicas of an object in `{{ $value }}` Placement Groups on the `{{ $labels.name }}` pool.

CephPGUndersized¶

Severity	Warning
Summary	Too many undersized Ceph PGs.
Description	The Ceph cluster reports `{{ $value }}` Placement Groups have fewer copies than the configured pool replication level on the `{{ $labels.name }}` pool.