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OpenZFS on Linux and FreeBSD
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Serapheim Dimitropoulos c853f382db Change target size of metaslabs from 256GB to 16GB 
= Old behavior

For vdev sizes 100GB to 50TB we keep ~200 metaslabs per
vdev and the metaslab size grows from 512MB to 256GB.
For vdev's bigger than that we start increasing the
number of metaslabs until we hit the 128K limit.

= New Behavior

For vdev sizes 100GB to 3TB we keep ~200 metaslabs per
vdev and the metaslab size grows from 512MB to 16GB.
For vdev's bigger than that we start increasing the
number of metaslabs until we hit the 128K limit.

= Reasoning

The old behavior makes metaslabs grow in size when
the vdev range is between 3TB (ms_size 16GB) and
32PB (ms_size 256GB). Even though keeping the number
of metaslabs is good in terms of potential number of
I/Os per TXG, these bigger metaslabs take longer
to be loaded and after they are loaded they can
take up a lot of memory because of their range trees.

This change tries to put a boundary in memory and
loading time for the specific range of vdev sizes.

Reviewed-by: Matt Ahrens <mahrens@delphix.com>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: Don Brady <don.brady@delphix.com>
Signed-off-by: Serapheim Dimitropoulos <serapheim@delphix.com>
Closes #8324
 		2019-01-25 16:38:27 -08:00
.github Bump commit subject length to 72 characters 2019-01-08 09:23:05 -08:00
cmd Rename range_tree_verify to range_tree_verify_not_present 2019-01-25 09:51:24 -08:00
config pyzfs: python3 support (build system) 2019-01-06 10:39:41 -08:00
contrib Add contrib/pyzfs/setup.py to .gitignore 2019-01-13 10:04:38 -08:00
etc Add enclosure_symlinks option to vdev_id 2018-12-14 17:27:49 -08:00
include Rename range_tree_verify to range_tree_verify_not_present 2019-01-25 09:51:24 -08:00
lib Include third party licenses in dist tarballs 2019-01-08 09:29:34 -08:00
man Change target size of metaslabs from 256GB to 16GB 2019-01-25 16:38:27 -08:00
module Change target size of metaslabs from 256GB to 16GB 2019-01-25 16:38:27 -08:00
rpm Add pyzfs BuildRequires for mock(1) 2019-01-13 10:02:33 -08:00
scripts dkms: Enable debuginfo option to be set with zfs sysconfig file 2019-01-18 10:10:24 -08:00
tests Change target size of metaslabs from 256GB to 16GB 2019-01-25 16:38:27 -08:00
udev Add enclosure_symlinks option to vdev_id 2018-12-14 17:27:49 -08:00
.gitignore Verify .gitignore entries 2019-01-15 11:56:29 -08:00
.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
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
META Tag 0.8.0-rc3 2019-01-14 12:40:42 -08:00
Makefile.am Verify .gitignore entries 2019-01-15 11:56:29 -08:00
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
autogen.sh Cause autogen.sh to fail if autoreconf fails 2018-07-06 09:27:37 -07:00
configure.ac Use ZFS version for pyzfs & drop unused reqs file 2019-01-08 15:56:42 -08:00
copy-builtin Allow copy-builtin to work with modified sources 2018-10-17 12:06:05 -07:00
zfs.release.in Move zfs.release generation to configure step 2012-07-12 12:22:51 -07:00

README.md

img

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.