Show Table of Contents Hide Table of Contents English 日本語 English Multi-page HTML Single-page HTML PDF ePub Troubleshooting Guide1. Initial Troubleshooting1.1. Identifying Problems1.1.1. Diagnosing the Health of a Ceph Storage Cluster1.2. Understanding the Output of the ceph health Command1.3. Understanding Ceph Logs2. Configuring Logging2.1. Ceph Subsystems2.2. Configuring Logging at Runtime2.3. Configuring Logging in the Ceph Configuration File2.4. Accelerating Log Rotation3. Troubleshooting Networking Issues3.1. Basic Networking Troubleshooting3.2. Basic NTP Troubleshooting4. Troubleshooting Monitors4.1. The Most Common Error Messages Related to Monitors4.1.1. A Monitor Is Out of Quorum4.1.2. Clock Skew4.1.3. The Monitor Store is Getting Too Big4.1.4. Understanding Monitor Status4.2. Injecting a Monitor Map4.3. Recovering the Monitor Store4.4. Replacing a Failed Monitor4.5. Compacting the Monitor Store5. Troubleshooting OSDs5.1. The Most Common Error Messages Related to OSDs5.1.1. Full OSDs5.1.2. Nearfull OSDs5.1.3. One or More OSDs Are Down5.1.4. Flapping OSDs5.1.5. Slow Requests, and Requests are Blocked5.2. Stopping and Starting Rebalancing5.3. Mounting the OSD Data Partition5.4. Replacing an OSD Drive5.5. Increasing the PID count5.6. Deleting Data from a Full Cluster6. Troubleshooting Placement Groups6.1. The Most Common Error Messages Related to Placement Groups6.1.1. Stale Placement Groups6.1.2. Inconsistent Placement Groups6.1.3. Unclean Placement Groups6.1.4. Inactive Placement Groups6.1.5. Placement Groups Are down6.1.6. Unfound Objects6.2. Listing Placement Groups in stale, inactive, or unclean State6.3. Listing Inconsistencies6.4. Repairing Inconsistent Placement Groups6.5. Increasing the PG Count7. Contacting Red Hat Support Service7.1. Providing Information to Red Hat Support Engineers7.2. Generating Readable Core Dump FilesA. Subsystems Default Logging Levels ValuesLegal Notice Troubleshooting Guide Red Hat Ceph Storage 2Troubleshooting Red Hat Ceph Storage Red Hat Ceph Storage Documentation Team email@example.com Legal NoticeAbstract This document describes how to resolve common problems with Red Hat Ceph Storage. 1. Initial Troubleshooting Where did the comment section go?Red Hat's documentation publication system recently went through an upgrade to enable speedier, more mobile-friendly content. We decided to re-evaluate our commenting platform to ensure that it meets your expectations and serves as an optimal feedback mechanism. During this redesign, we invite your input on providing feedback on Red Hat documentation via the discussion platform.