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Michael Niewöhner 6d1599c1e1 Increase default zcmd allocation to 256K 
When creating hundreds of clones (for example using containers with
LXD) cloning slows down as the number of clones increases over time.
The reason for this is that the fetching of the clone information
using a small zcmd buffer requires two ioctl calls, one to determine
the size and a second to return the data. However, this requires
gathering the data twice, once to determine the size and again to
populate the zcmd buffer to return it to userspace.
These are expensive ioctl() calls, so instead, make the default buffer
size much larger: 256K.

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: George Melikov <mail@gmelikov.ru>
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Signed-off-by: Michael Niewöhner <foss@mniewoehner.de>
Closes #9084
2019-09-25 11:27:50 -07:00
.github Update CONTRIBUTING to point users to IRC as well as mailing list 2019-03-13 11:57:57 -07:00
cmd zed crashes when devid not present 2019-09-25 11:27:50 -07:00
config Minor style cleanup 2019-09-25 11:27:49 -07:00
contrib Fix out-of-tree build failures 2019-09-25 11:27:48 -07:00
etc Race between zfs-share and zfs-mount services 2019-09-25 11:27:50 -07:00
include Race condition between spa async threads and export 2019-09-25 11:27:50 -07:00
lib Increase default zcmd allocation to 256K 2019-09-25 11:27:50 -07:00
man systemd encryption key support 2019-09-25 11:27:49 -07:00
module Improve performance by using dmu_tx_hold_*_by_dnode() 2019-09-25 11:27:50 -07:00
rpm pkg-utils python sitelib for SLES15 2019-09-25 11:27:49 -07:00
scripts Fix out-of-tree build failures 2019-09-25 11:27:48 -07:00
tests Implement secpolicy_vnode_setid_retain() 2019-09-25 11:27:50 -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 Implement secpolicy_vnode_setid_retain() 2019-09-25 11:27:50 -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 Fix out-of-tree build failures 2019-09-25 11:27:48 -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

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.