76e55911da
This commit allows you to automatically backup allocation class vdevs to the pool. If the alloc class vdev is fully backed up, it can fail without the pool losing any data. This also means you can safely create pools with non-matching alloc class redundancy (like a mirrored pool with a single special device). It works by making sure all alloc class writes have at least two DVA copies, and then having the 2nd copy always go to the pool itself. So whenever you write to an alloc class vdev, another copy of the data is also written to the pool. This behavior is controlled via three properties: 1. feature@allow_backup_to_pool - This feature flag enables the backup subsystem. It also prevents the backed-up pool from being imported read/write on an older version of ZFS that does not support alloc class backups. 2. backup_alloc_class_to_pool - This pool property is the main on/off switch to control the backup feature. It is on by default but can be turned off at any time. Once it is turned off, then all existing vdevs will no longer considered to be fully backed up. 3. backup_to_pool - This is a read-only vdev property that will report "on" if all the data on the vdev is fully backed up to the pool. Note that the backup to pool feature is now enabled by default on all new pools. This may create a performance penalty over pure alloc class writes due to the extra backup copy write to the pool. Alloc class reads should not be affected as they always read from DVA 0 first (the copy of the data on the special device). Closes: #15118 Signed-off-by: Tony Hutter <hutter2@llnl.gov> |
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README.md
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.
Official Resources
- Documentation - for using and developing this repo
- ZoL Site - Linux release info & links
- Mailing lists
- OpenZFS site - for conference videos and info on other platforms (illumos, OSX, Windows, etc)
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
METAfile contains the officially recognized supported Linux kernel versions. - Supported FreeBSD versions are any supported branches and releases starting from 12.4-RELEASE.