Rob N 4fe9cc5437 man: note that zdb operates directly on pool storage
A frequent misunderstanding is that zdb accesses the pool through the
kernel or filesystem, leading to confusion particularly when it can't
access something that it seems like it should be able to.

I've seen this confusion recently when zdb couldn't access a pool because
the user didn't have permission to read directly from the block devices,
and when it couldn't show attributes of encrypted files even though the
dataset was unlocked.

The manpage already speaks to another symptom of this, namely that zdb
may "behave erratically" on an active pool; here I'm trying to make that
a little more explicit.

Reviewed-by: Richard Yao <richard.yao@alumni.stonybrook.edu>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: George Melikov <mail@gmelikov.ru>
Signed-off-by: Rob Norris <robn@despairlabs.com>
Closes #14539
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OpenZFS is an advanced file system and volume manager which was originally developed for Solaris and is now maintained by the OpenZFS community. This repository contains the code for running OpenZFS on Linux and FreeBSD.

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Official Resources

Installation

Full documentation for installing OpenZFS on your favorite operating system can be found at the Getting Started Page.

Contribute & Develop

We have a separate document with contribution guidelines.

We have a Code of Conduct.

Release

OpenZFS is released under a CDDL license. For more details see the NOTICE, LICENSE and COPYRIGHT files; UCRL-CODE-235197

Supported Kernels

  • The META file contains the officially recognized supported Linux kernel versions.
  • Supported FreeBSD versions are any supported branches and releases starting from 12.2-RELEASE.
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