Ceph OSD_DISK_FAILURE

An OSD's disk has failed, affecting its ability to store data.

Understanding Ceph and Its Purpose

Ceph is an open-source storage platform designed to provide highly scalable object, block, and file-based storage under a unified system. It is renowned for its reliability, scalability, and performance, making it a popular choice for cloud infrastructure and large-scale data storage solutions. Ceph's architecture is based on a distributed system of Object Storage Daemons (OSDs), which are responsible for storing data, handling data replication, recovery, and rebalancing.

Identifying the Symptom: OSD Disk Failure

One of the common issues encountered in a Ceph cluster is the failure of an OSD disk. This issue is typically observed when an OSD becomes unresponsive or is marked as 'down' or 'out' in the cluster status. This can lead to degraded performance and potential data unavailability if not addressed promptly.

Signs of OSD Disk Failure

OSD is marked as 'down' or 'out' in the Ceph status.
Increased latency or degraded performance in data access.
Ceph health warnings indicating issues with specific OSDs.

Explaining the Issue: OSD_DISK_FAILURE

The OSD_DISK_FAILURE error indicates that the disk associated with an OSD has failed. This failure can occur due to hardware malfunctions, disk corruption, or other physical issues affecting the disk's ability to function properly. When an OSD disk fails, it disrupts the normal operation of the Ceph cluster, as the affected OSD can no longer store or retrieve data.

Impact of OSD Disk Failure

The failure of an OSD disk can lead to several issues, including:

Reduced data redundancy and increased risk of data loss.
Potential performance bottlenecks due to rebalancing and recovery operations.
Increased load on remaining OSDs, affecting overall cluster performance.

Steps to Fix the OSD Disk Failure

To resolve the OSD_DISK_FAILURE issue, follow these steps to replace the failed disk and restore the OSD to the cluster:

Step 1: Identify the Failed OSD

Use the following command to check the status of the OSDs and identify the failed one:

ceph osd tree

Look for OSDs marked as 'down' or 'out'.

Step 2: Remove the Failed OSD

Once identified, remove the failed OSD from the cluster:

ceph osd out <osd-id>

Replace <osd-id> with the ID of the failed OSD.

Step 3: Replace the Failed Disk

Physically replace the failed disk with a new one. Ensure that the new disk is properly connected and recognized by the system.

Step 4: Re-add the OSD to the Cluster

Prepare the new disk and add it back to the cluster:

ceph-volume lvm create --data /dev/<new-disk>

Then, re-add the OSD:

ceph osd in <osd-id>

Additional Resources

For more detailed guidance on managing OSDs in Ceph, refer to the official Ceph documentation. Additionally, the Ceph community website offers a wealth of resources and support for troubleshooting and optimizing your Ceph cluster.

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MORE ISSUES

PGs are undergoing repair operations, often due to data inconsistencies or corruption.

Ceph Monitor disk I/O error affecting Ceph monitor functionality.

A monitor's disk is experiencing I/O errors.

Ceph OSD_DISK_IO_ERROR

An OSD's disk is experiencing I/O errors, affecting its ability to store data.

Ceph MDS_DISK_FULL

The MDS's disk is full, affecting its ability to function properly.

Ceph RADOS Gateway experiencing performance issues due to network problems.

Network configurations or connectivity issues affecting RADOS Gateway communication.

Ceph The RADOS Gateway service is down, affecting object storage access.

The RADOS Gateway service is not running, which could be due to network issues, resource constraints, or configuration errors.

Ceph Network congestion is affecting OSD communication, leading to performance degradation.

Network congestion is affecting OSD communication, leading to performance degradation.

Ceph PG_BACKFILL

PGs are undergoing backfill operations, often due to OSD additions or recoveries.

Ceph POOL_QUOTA_EXCEEDED

A pool has exceeded its configured quota, preventing further writes.

Ceph Monitor experiencing high CPU usage

A monitor is experiencing high CPU usage, affecting its performance.

Ceph OSD_DISK_SLOW

An OSD's disk is performing slowly, affecting its ability to serve data.

Ceph MDS_NETWORK_ISSUE

Network issues are affecting MDS communication, leading to performance problems.

Ceph OSD is experiencing high CPU usage.

An OSD is experiencing high CPU usage, affecting its performance.

Ceph Authentication failures when accessing the RADOS Gateway.

Incorrect credentials or configuration settings.

Ceph PG_SCRUB_ERRORS

Errors occurred during PG scrubbing, possibly due to data corruption.

Ceph A monitor is consuming excessive memory, possibly due to a memory leak.

A monitor is consuming excessive memory, possibly due to a memory leak.

Ceph High network latency is affecting OSD performance.

High network latency

Ceph RGW_BUCKET_NOT_FOUND

A requested bucket does not exist in the RADOS Gateway.

Ceph The MDS is consuming excessive memory, possibly due to a memory leak.

The MDS is consuming excessive memory, possibly due to a memory leak.

Ceph An OSD is consuming excessive memory, possibly due to a memory leak.

The OSD process may have a memory leak, causing it to consume more memory than expected.

Ceph OSD_DISK_FAILURE

An OSD's disk has failed, affecting its ability to store data.

Ceph PG_INCOMPLETE

PGs are incomplete, often due to missing OSDs or data corruption.

Ceph Monitor nodes are experiencing communication issues, leading to quorum problems.

Network issues are affecting monitor communication.

An MDS instance is stale, possibly due to network issues or failover problems.

Ceph Monitor daemon crash in Ceph cluster.

A monitor daemon has crashed, possibly due to software bugs or resource exhaustion.

Ceph An OSD's journal is full, affecting its ability to process writes.

The journal size is insufficient for the current workload, or there may be a configuration issue.

Ceph POOL_NOT_FOUND

A requested pool does not exist, possibly due to configuration errors or deletion.

Ceph OSD_NETWORK_ISSUE

Network issues are affecting OSD communication, leading to degraded performance or failures.

Ceph An OSD is repeatedly going up and down, often due to unstable hardware or network issues.

Unstable hardware or network issues causing OSD flapping.

The RADOS Gateway is experiencing slow performance, possibly due to high load or resource constraints.

Ceph The MDS is overloaded, affecting CephFS performance.

The MDS is overloaded due to high metadata operations, insufficient resources, or improper configuration.

Ceph OSD daemon crash

Software bugs or hardware issues

Ceph PG_UNCLEAN

PGs are not in a clean state, often due to OSD failures or ongoing recovery operations.

Ceph Monitor disk is full, causing operational issues.

The monitor's disk has reached its storage capacity limit.

Ceph INCOMPATIBLE_CLIENT error encountered when a client tries to connect to the Ceph cluster.

A client is using an incompatible version of the Ceph software.

Ceph SLOW_REQUESTS

Requests to the cluster are slow, possibly due to high load or resource contention.

Ceph RADOSGW_UNAVAILABLE

The RADOS Gateway (RGW) is unavailable, affecting object storage access.

Ceph MDS failover is not occurring as expected.

Configuration issues with MDS or improperly configured standby MDS instances.

The Metadata Server (MDS) is down, affecting CephFS operations.

Ceph Communication issues between Ceph components due to network partition.

A network partition is causing communication issues between Ceph components.

Ceph CRUSH_MAP_ERROR

Errors in the CRUSH map configuration, potentially causing data placement issues.

Ceph Authentication failure between Ceph components.

Incorrect keyring or configuration settings.

Ceph An OSD has reached its full capacity, preventing further writes.

An OSD has reached its full capacity, preventing further writes.

Operations are taking longer than expected, possibly due to high load, network latency, or hardware bottlenecks.

Ceph MON_QUORUM_LOST

The monitor quorum is lost, often due to network partitions or multiple monitor failures.

PGs are stuck in a non-active state, possibly due to OSDs being down or network partitions.

Ceph PG_DEGRADED

Placement Groups (PGs) are not fully replicated, often due to OSD failures or network issues.

Ceph An OSD is marked as out, meaning it is not part of the active cluster and not serving data.

The OSD might be down or manually marked out due to maintenance or failure.

Ceph An OSD is marked as down in the Ceph cluster.

Network issues, hardware failure, or the OSD daemon crashing.

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