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Serapheim Dimitropoulos b63ed49c29 Reduced IOPS when all vdevs are in the zfs_mg_fragmentation_threshold 
Historically while doing performance testing we've noticed that IOPS
can be significantly reduced when all vdevs in the pool are hitting
the zfs_mg_fragmentation_threshold percentage. Specifically in a
hypothetical pool with two vdevs, what can happen is the following:
Vdev A would go above that threshold and only vdev B would be used.
Then vdev B would pass that threshold but vdev A would go below it
(we've been freeing from A to allocate to B). The allocations would
go back and forth utilizing one vdev at a time with IOPS taking a hit.

Empirically, we've seen that our vdev selection for allocations is
good enough that fragmentation increases uniformly across all vdevs
the majority of the time. Thus we set the threshold percentage high
enough to avoid hitting the speed bump on pools that are being pushed
to the edge. We effectively disable its effect in the majority of the
cases but we don't remove (at least for now) just in case we hit any
weird behavior in the future.

Reviewed-by: George Melikov <mail@gmelikov.ru>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: Matt Ahrens <mahrens@delphix.com>
Signed-off-by: Serapheim Dimitropoulos <serapheim@delphix.com>
Closes #8859
2019-09-25 11:27:46 -07:00
.github Update CONTRIBUTING to point users to IRC as well as mailing list 2019-03-13 11:57:57 -07:00
cmd grammar: it is / plural agreement 2019-09-25 11:27:46 -07:00
config Remove vn_set_fs_pwd()/vn_set_pwd() (no need to be at / during insmod) 2019-09-25 11:27:46 -07:00
contrib If $ZFS_BOOTFS contains guid, replace the guid portion with $pool 2019-06-07 12:45:40 -07:00
etc Fix zfs-mount-generator for datasets with spaces 2019-05-07 09:32:23 -07:00
include Remove vn_set_fs_pwd()/vn_set_pwd() (no need to be at / during insmod) 2019-09-25 11:27:46 -07:00
lib Refactor parent dataset handling in libzfs zfs_rename() 2019-09-25 11:27:46 -07:00
man Reduced IOPS when all vdevs are in the zfs_mg_fragmentation_threshold 2019-09-25 11:27:46 -07:00
module Reduced IOPS when all vdevs are in the zfs_mg_fragmentation_threshold 2019-09-25 11:27:46 -07:00
rpm Add diffutils dependency for dkms build 2019-02-20 10:04:05 -08:00
scripts Fix %post and %postun generation in kmodtool 2019-06-11 10:44:54 -07:00
tests hkdf_test binary should only have one icp instance 2019-06-07 12:45:40 -07:00
udev Add enclosure_symlinks option to vdev_id 2018-12-14 17:27:49 -08:00
.gitignore git ignore python 3.7 virtual environment directories 2019-03-25 15:05:26 -07:00
.gitmodules Add zimport.sh compatibility test script 2014-02-21 12:10:31 -08:00
.travis.yml Add .travis.yml 2017-11-13 09:18:18 -08:00
AUTHORS Update build system and packaging 2018-05-29 16:00:33 -07:00
autogen.sh Cause autogen.sh to fail if autoreconf fails 2018-07-06 09:27:37 -07:00
CODE_OF_CONDUCT.md Add CODE_OF_CONDUCT.md 2019-04-30 10:58:45 -07:00
configure.ac Add TRIM support 2019-03-29 09:13:20 -07:00
copy-builtin Allow copy-builtin to work with modified sources 2018-10-17 12:06:05 -07:00
COPYRIGHT Update build system and packaging 2018-05-29 16:00:33 -07:00
LICENSE Update build system and packaging 2018-05-29 16:00:33 -07:00
Makefile.am zfs-tests: fix warnings when packaging some .shlib files 2019-06-07 12:39:13 -07:00
META Tag zfs-0.8.1 2019-06-14 09:43:18 -07:00
NEWS Add NEWS file 2018-09-18 12:03:47 -07:00
NOTICE Update build system and packaging 2018-05-29 16:00:33 -07:00
README.md Explicitly state supported Linux versions 2018-05-30 20:11:19 -07:00
TEST Update build system and packaging 2018-05-29 16:00:33 -07:00
zfs.release.in Move zfs.release generation to configure step 2012-07-12 12:22:51 -07:00

README.md

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ZFS on Linux is an advanced file system and volume manager which was originally developed for Solaris and is now maintained by the OpenZFS community.

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Official Resources

Installation

Full documentation for installing ZoL on your favorite Linux distribution can be found at our site.

Contribute & Develop

We have a separate document with contribution guidelines.

Release

ZFS on Linux 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 kernel versions.