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The redundant_metadata setting in ZFS allows users to trade resilience for performance and space savings. This applies to all data and metadata blocks in zfs, with one exception: gang blocks. Gang blocks currently just take the copies property of the IO being ganged and, if it's 1, sets it to 2. This means that we always make at least two copies of a gang header, which is good for resilience. However, if the users care more about performance than resilience, their gang blocks will be even more of a penalty than usual. We add logic to calculate the number of gang headers copies directly, and store it as a separate IO property. This is stored in the IO properties and not calculated when we decide to gang because by that point we may not have easy access to the relevant information about what kind of block is being stored. We also check the redundant_metadata property when doing so, and use that to decide whether to store an extra copy of the gang headers, compared to the underlying blocks. Sponsored-by: Klara, Inc. Sponsored-by: Wasabi Technology, Inc. Signed-off-by: Paul Dagnelie <paul.dagnelie@klarasystems.com> Co-authored-by: Paul Dagnelie <paul.dagnelie@klarasystems.com> Reviewed-by: Alexander Motin <mav@FreeBSD.org> Reviewed-by: Tony Hutter <hutter2@llnl.gov> |
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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.
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 13.0-RELEASE.