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Mike Gerdts f3f46b0e45 OpenZFS 9318 - vol_volsize_to_reservation does not account for raidz skip blocks 
When a volume is created in a pool with raidz vdevs and
volblocksize != 128k, the volume can reference more space than is
reserved with the automatically calculated refreservation.  There
are two deficiencies in vol_volsize_to_reservation that contribute
to this:

  1) Skip blocks may be added to keep each allocation a multiple
     of parity + 1. This is the dominating factor when volblocksize
     is close to 2^ashift.

  2) raidz deflation for 128 KB blocks is different for most other
     block sizes.

See "The theory of raidz space accounting" comment in
libzfs_dataset.c for a full explanation.

Authored by: Mike Gerdts <mike.gerdts@joyent.com>
Reviewed by: Richard Elling <Richard.Elling@RichardElling.com>
Reviewed by: Sanjay Nadkarni <sanjay.nadkarni@nexenta.com>
Reviewed by: Jerry Jelinek <jerry.jelinek@joyent.com>
Reviewed by: Matt Ahrens <matt@delphix.com>
Reviewed by: Kody Kantor <kody.kantor@joyent.com>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Approved by: Dan McDonald <danmcd@joyent.com>
Ported-by: Mike Gerdts <mike.gerdts@joyent.com>

Porting Notes:
* ZTS: wait for zvols to exist before writing
* ZTS: use log_must_busy with {zpool|zfs} destroy

OpenZFS-issue: https://www.illumos.org/issues/9318
OpenZFS-commit: https://github.com/illumos/illumos-gate/commit/b73ccab0
Closes #8973
2020-01-22 13:48:56 -08:00
.github Update CONTRIBUTING to point users to IRC as well as mailing list 2019-03-13 11:57:57 -07:00
cmd OpenZFS 9318 - vol_volsize_to_reservation does not account for raidz skip blocks 2020-01-22 13:48:56 -08:00
config Minor style cleanup 2019-09-25 11:27:49 -07:00
contrib Fix Plymouth passphrase prompt in initramfs script 2019-09-25 11:27:50 -07:00
etc New service that waits on zvol links to be created 2019-09-25 11:27:51 -07:00
include OpenZFS 9318 - vol_volsize_to_reservation does not account for raidz skip blocks 2020-01-22 13:48:56 -08:00
lib OpenZFS 9318 - vol_volsize_to_reservation does not account for raidz skip blocks 2020-01-22 13:48:56 -08:00
man looping in metaslab_block_picker impacts performance on fragmented pools 2020-01-22 13:48:56 -08:00
module Concurrent small allocation defeats large allocation 2020-01-22 13:48:56 -08:00
rpm BuildRequires libtirpc-devel needed for RHEL 8 2019-09-25 11:27:51 -07:00
scripts kmodtool: depmod path 2019-09-25 11:27:51 -07:00
tests OpenZFS 9318 - vol_volsize_to_reservation does not account for raidz skip blocks 2020-01-22 13:48:56 -08:00
udev Add enclosure_symlinks option to vdev_id 2018-12-14 17:27:49 -08:00
.gitignore Linux 5.3 compat: Makefile subdir-m no longer supported 2019-09-25 11:27:50 -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 New service that waits on zvol links to be created 2019-09-25 11:27:51 -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-0.8.2 2019-09-25 11:27:51 -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.