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John Poduska c161360dce Resilver restarts unnecessarily when it encounters errors 
When a resilver finishes, vdev_dtl_reassess is called to hopefully
excise DTL_MISSING (amongst other things). If there are errors during
the resilver, they are tracked in DTL_SCRUB, as spelled out in the
block comment in vdev.c. DTL_SCRUB is in-core only, so it can only
be used if the pool was online for the whole resilver. This state is
tracked with the spa_scrub_started flag, which only gets set when
the scan is initialized. Unfortunately, this flag gets cleared right
before vdev_dtl_reassess gets called, so if there are any errors
during the scan, DTL_MISSING will never get excised and the resilver
will just continually restart. This fix simply moves clearing that
flag until after the call to vdev_dtl_reasses.

In addition, if a pool is imported and already has scn_errors > 0,
this change will restart the resilver immediately instead of doing
the rest of the scan and then restarting it from the beginning. On
the other hand, if scn_errors == 0 at import, then no errors have
been encountered so far, so the spa_scrub_started flag can be safely
set.

A test has been added to verify that resilver does not restart when
relevant DTL's are available.

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: Paul Zuchowski <pzuchowski@datto.com>
Signed-off-by: John Poduska <jpoduska@datto.com>
Closes #10291
2020-09-22 11:33:35 -07:00
.github Fix typos 2020-01-22 13:49:00 -08:00
cmd ZED: Do not offline a missing device if no spare is available 2020-09-16 14:48:22 -07:00
config Linux 5.9 compat: NR_SLAB_RECLAIMABLE (#10865) 2020-09-15 21:16:58 +00:00
contrib Fix zfs-functions packaging bug 2020-05-12 10:53:32 -07:00
etc Fix zfs-functions packaging bug 2020-05-12 10:53:32 -07:00
include Appease GCC sprintf warnings found on Fedora 32/GCC 10.0.1 2020-09-15 23:43:12 +00:00
lib Appease GCC sprintf warnings found on Fedora 32/GCC 10.0.1 2020-09-15 23:43:12 +00:00
man ICP: Improve AES-GCM performance 2020-05-12 10:53:32 -07:00
module Resilver restarts unnecessarily when it encounters errors 2020-09-22 11:33:35 -07:00
rpm lib/libzfs, rpm: Install pkgconfig files in the correct directory (#10628) 2020-09-15 21:16:58 +00:00
scripts Fix typos 2020-01-22 13:49:00 -08:00
tests Resilver restarts unnecessarily when it encounters errors 2020-09-22 11:33:35 -07:00
udev Restore :: in Makefile.am 2020-05-12 10:53:32 -07:00
.gitignore Adapt gitignore for modules 2020-01-22 13:49:05 -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 Linux 5.9 compat: add linux/blkdev.h include 2020-09-15 21:16:58 +00:00
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 Fix zfs-functions packaging bug 2020-05-12 10:53:32 -07:00
copy-builtin Allow copy-builtin to work with modified sources 2018-10-17 12:06:05 -07:00
COPYRIGHT ICP: Improve AES-GCM performance 2020-05-12 10:53:32 -07:00
LICENSE Update build system and packaging 2018-05-29 16:00:33 -07:00
Makefile.am Perform KABI checks in parallel 2020-01-22 13:49:01 -08:00
META Tag zfs-0.8.4 2020-05-12 10:53:32 -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.