74230a5bc1
Before this change for every valid parity column raidz_parity_verify() allocated new buffer and copied there existing data, then recalculated the parity and compared the result with the copy. This patch removes the memory copy, simply swapping original buffer pointers with newly allocated empty ones for parity recalculation and comparison. Original buffers with potentially incorrect parity data are then just freed, while new recalculated ones are used for repair. On a pool of 12 4-wide raidz vdevs, storing 1.5TB of 16MB blocks, this change reduces memory traffic during scrub by 17% and total unhalted CPU time by 25%. Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Alexander Motin <mav@FreeBSD.org> Sponsored-By: iXsystems, Inc. Closes #13613 |
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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 12.2-RELEASE.