zdb

1. The zdb command line tool is primarily used for examining and debugging the ZFS file system.
2. It is available on Unix-like operating systems, particularly those that utilize ZFS.
3. Zdb stands for ZFS Debugger, and it allows users to query and analyze various aspects of the ZFS file system.
4. It provides detailed information regarding ZFS pools, datasets, file systems, and their associated properties and attributes.
5. With zdb, users can investigate issues related to ZFS, such as corruption, disk errors, and performance problems.
6. The tool can display data structures, including vdevs (virtual devices), znodes, blocks, and their metadata.
7. Zdb can also be used to analyze the historical state of the file system, such as examining snapshots and their specific properties.
8. It offers options to verify data integrity, check checksums, and perform consistency checks on the ZFS storage pool.
9. Through zdb, users can gather important statistics about their ZFS environment, such as IO rates, space usage, and performance metrics.
10. The tool requires administrative privileges and should be used with caution as it provides extensive access and control over the ZFS file system.