zdb:tldr:763fb
The "zdb" command is a utility in the ZFS file system (ZFS stands for Zettabyte File System). It provides detailed information and analysis about ZFS pools, datasets, and other storage-related aspects.
Here are a few key aspects of the "zdb" command:
-
Function: The primary purpose of "zdb" is to aid in troubleshooting and debugging ZFS-related issues. It allows administrators to examine the internal structure of ZFS pools and datasets.
-
Pool Information: Running "zdb" without any arguments displays a summary of information about all the ZFS pools present in the system. This includes details such as the pool name, state, size, number of devices, and more.
-
Dataset Analysis: By providing the name of a specific dataset as an argument to "zdb", it provides a detailed analysis of that particular dataset. This includes information about the dataset's properties, attributes, blocks, and statistics.
-
Metadata Dump: The "zdb" command can also be used to create a binary dump of the ZFS dataset metadata, which can be useful for further analysis or troubleshooting.
-
Advanced Options: The "zdb" command offers various advanced options that allow administrators to fine-tune the output and analysis. These options include examining individual ZFS blocks, investigating transaction groups, displaying detailed error information, and more.
It is important to note that "zdb" is a powerful command that should be used with caution, preferably by experienced administrators or with guidance from knowledgeable resources.