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spa_preferred_class() selects a storage class based on (among other things) the DMU object type. This only works for old-style object types that match only one specific kind of thing. For DMU_OTN_ types we need another way to signal the storage class. This commit allows the object type to be overridden in the IO policy for the purposes of choosing a storage class. It then adds the ability to set the storage type on a dnode hold, such that all writes generated under that hold will get it. This method has two shortcomings: - it would be better if we could "name" a set of storage class preferences rather than it being implied by the object type. - it would be better if this info were stored in the dnode on disk. In the absence of those things, this seems like the smallest possible change. Reviewed-by: Alexander Motin <mav@FreeBSD.org> Reviewed-by: Tony Hutter <hutter2@llnl.gov> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Rob Norris <rob.norris@klarasystems.com> Sponsored-by: Klara, Inc. Sponsored-by: iXsystems, Inc. Closes #15894 |
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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 12.4-RELEASE.