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Alan Somers 2d8f72d76c
zpool: speed up importing large pools (#11469)
The ZFS_IOC_POOL_TRYIMPORT ioctl returns an nvlist from the kernel to a
preallocated buffer in  userland.  Userland must guess how large the
buffer should be.  If it undersizes it, it must reallocate and try
again.  That can cost a lot of time for large pools.

OpenZFS commit 28b40c8a6e set the guess at "zc.zc_nvlist_conf_size * 4"
without explanation.  On my system, that is too small.  From experiment,
x 32 is a better multiplier.  But I don't know how to calculate it
theoretically.

Sponsored by:	Axcient
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: Alek Pinchuk <apinchuk@axcient.com>
Signed-off-by:	Alan Somers <asomers@gmail.com>
Closes #11469
2021-01-21 12:55:54 -08:00
.github Forward questions to github discussions 2020-12-21 20:09:02 -08:00
cmd allow callers to allocate and provide the abd_t struct 2021-01-20 11:24:37 -08:00
config Autoconf 2.70 compatibility 2021-01-02 16:55:55 -08:00
contrib ZTS: avoid piping to special devices 2021-01-19 11:53:35 -08:00
etc Verify zfs module loaded before starting services 2020-11-28 11:11:18 -08:00
include Extending FreeBSD UIO Struct 2021-01-20 21:27:30 -08:00
lib zpool: speed up importing large pools (#11469) 2021-01-21 12:55:54 -08:00
man Only examine best metaslabs on each vdev 2020-12-16 14:40:05 -08:00
module Linux 5.10 compat: restore custom uio_prefaultpages() 2021-01-21 10:43:39 -08:00
rpm zfs-kmods: install to /lib/modules instead of /usr/lib/modules 2020-12-21 20:14:32 -08:00
scripts DKMS: Disable weak modules 2020-12-15 09:22:30 -08:00
tests Extending FreeBSD UIO Struct 2021-01-20 21:27:30 -08:00
udev Centralize variable substitution 2020-07-14 17:33:44 -07:00
.editorconfig Add an .editorconfig; document git whitespace settings 2020-01-27 13:32:52 -08:00
.gitignore Add FreeBSD support to OpenZFS 2020-04-14 11:36:28 -07:00
.gitmodules Add zimport.sh compatibility test script 2014-02-21 12:10:31 -08:00
AUTHORS Add zstd support to zfs 2020-08-20 10:30:06 -07:00
autogen.sh Cause autogen.sh to fail if autoreconf fails 2018-07-06 09:27:37 -07:00
CODE_OF_CONDUCT.md Replace ZFS on Linux references with OpenZFS 2020-10-08 20:10:13 -07:00
configure.ac Autoconf 2.70 compatibility 2021-01-02 16:55:55 -08:00
copy-builtin Replace ZFS on Linux references with OpenZFS 2020-10-08 20:10:13 -07:00
COPYRIGHT Fix typos 2020-06-09 21:24:09 -07:00
cppcheck-suppressions.txt Import ZStandard v1.4.5 2020-08-20 10:30:06 -07:00
LICENSE Update build system and packaging 2018-05-29 16:00:33 -07:00
Makefile.am dracut: use /bin/sh instead of bash as the intepreter 2020-11-28 11:02:08 -08:00
META Linux 5.10 compat: META 2020-12-23 08:55:02 -08:00
NEWS Fix NEWS file 2020-08-26 21:44:41 -07:00
NOTICE Update build system and packaging 2018-05-29 16:00:33 -07:00
README.md docs: update README's installation link 2020-10-08 09:33:53 -07:00
TEST Remove CI builder customization from TEST 2020-03-16 10:46:03 -07:00
zfs.release.in Move zfs.release generation to configure step 2012-07-12 12:22:51 -07:00

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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.

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Official Resources

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 META file contains the officially recognized supported Linux kernel versions.
  • Supported FreeBSD versions are 12-STABLE and 13-CURRENT.