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d151432073
When ZIL allocates space for new LWBs without knowing how much it will require, it can use new metaslab_alloc_range() function to allocate slightly more or less than it predicted. It allows to improve space efficiency by allocating bigger LWBs on RAIDZ/dRAID instead of padding and possibly packing more ZIL records there. It may also allow to reduce ganging in some cases by allowing to allocate smaller LWBs when we are not sure we'll need bigger. On the opposite side, when we allocate space for already closed LWBs, when we precisely know how much space we need, we may just allocate what we need instead of relying on writing less than allocated, that does not work for RAIDZ. Space for LWBs in open state (still being filled) is allocated same as before. Reviewed-by: Rob Norris <robn@despairlabs.com> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Alexander Motin <alexander.motin@TrueNAS.com> Closes #17613 |
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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.