916d9de158
During sorted scrub multiple threads (one per vdev) are issuing many ZIOs same time, all using the same scn->scn_zio_root ZIO as parent. It causes huge lock contention on the single global lock on that ZIO. Improve it by introducing per-queue null ZIOs, children to that one, and using them instead as proxy. For 12 SSD pool storing 1.5TB of 4KB blocks on 80-core system this dramatically reduces lock contention and reduces scrub time from 21 minutes down to 12.5, while actual read stages (not scan) are about 3x faster, reaching 100K blocks per second per vdev. Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Alexander Motin <mav@FreeBSD.org> Sponsored-By: iXsystems, Inc. Closes #13553 |
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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.