FreeBSD src
1ac7d194e5
Issuing several scrub reads for a block we may use the parent ZIO buffer for one of child ZIOs. If that read complete successfully, then we won't need to copy the data explicitly. If block has only one copy (typical for root vdev, which is also a mirror inside), then we never need to copy -- succeed or fail as-is. Previous code also copied data from buffer of every successfully completed child ZIO, but that just does not make any sense. On healthy N-wide mirror this saves all N+1 (or even more in case of ditto blocks) memory copies for each scrubbed block, allowing CPU to focus mostly on check-summing. For other vdev types it should save one memory copy per block copy at root vdev. Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Reviewed-by: Mark Maybee <mark.maybee@delphix.com> Signed-off-by: Alexander Motin <mav@FreeBSD.org> Sponsored-By: iXsystems, Inc. Closes #13606 |
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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 12.2-RELEASE.