Archive-Team
/
zfs
2
0
Fork 0
Code Issues Pull Requests Packages Projects Releases 103 Wiki Activity
zfs/man/man8
History
Matthew Ahrens 652bdc9b0e
Deprecate deduplicated send streams 
Dedup send can only deduplicate over the set of blocks in the send
command being invoked, and it does not take advantage of the dedup table
to do so. This is a very common misconception among not only users, but
developers, and makes the feature seem more useful than it is. As a
result, many users are using the feature but not getting any benefit
from it.

Dedup send requires a nontrivial expenditure of memory and CPU to
operate, especially if the dataset(s) being sent is (are) not already
using a dedup-strength checksum.

Dedup send adds developer burden. It expands the test matrix when
developing new features, causing bugs in released code, and delaying
development efforts by forcing more testing to be done.

As a result, we are deprecating the use of `zfs send -D` and receiving
of such streams.  This change adds a warning to the man page, and also
prints the warning whenever dedup send or receive are used.

In a future release, we plan to:
1. remove the kernel code for generating deduplicated streams
2. make `zfs send -D` generate regular, non-deduplicated streams
3. remove the kernel code for receiving deduplicated streams
4. make `zfs receive` of deduplicated streams process them in userland
   to "re-duplicate" them, so that they can still be received.

Reviewed-by: Paul Dagnelie <pcd@delphix.com>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: George Melikov <mail@gmelikov.ru>
Signed-off-by: Matthew Ahrens <mahrens@delphix.com>
Closes #7887 
Closes #10117
 		2020-03-18 13:31:10 -07:00
..
.gitignore Ignore *.o.ur-safe build artifacts 2018-05-13 18:59:02 -07:00
Makefile.am Systemd mount generator: Generate noauto units; add control properties 2020-02-14 15:32:55 -08:00
fsck.zfs.8 Reorganize zpool(8) man page into sections 2019-11-13 09:21:07 -08:00
mount.zfs.8 zfs.8 & mount.zfs.8: fix a few typos 2016-05-16 12:26:31 -07:00
vdev_id.8 vdev_id support for device link aliases 2012-12-03 14:04:47 -08:00
zdb.8 Fix zdb -R with 'b' flag 2020-02-10 14:00:05 -08:00
zed.8.in Change http://zfsonlinux.org links to https://zfsonlinux.org 2020-01-13 16:43:59 -08:00
zfs-allow.8 Reorganize zfs(8) man page into sections 2019-11-12 11:17:40 -08:00
zfs-bookmark.8 Implement bookmark copying 2020-02-11 13:19:12 -08:00
zfs-change-key.8 Reorganize zfs(8) man page into sections 2019-11-12 11:17:40 -08:00
zfs-clone.8 Reorganize zfs(8) man page into sections 2019-11-12 11:17:40 -08:00
zfs-create.8 Reorganize zfs(8) man page into sections 2019-11-12 11:17:40 -08:00
zfs-destroy.8 Reorganize zfs(8) man page into sections 2019-11-12 11:17:40 -08:00
zfs-diff.8 Reorganize zfs(8) man page into sections 2019-11-12 11:17:40 -08:00
zfs-get.8 Reorganize zfs(8) man page into sections 2019-11-12 11:17:40 -08:00
zfs-groupspace.8 Reorganize zfs(8) man page into sections 2019-11-12 11:17:40 -08:00
zfs-hold.8 Reorganize zfs(8) man page into sections 2019-11-12 11:17:40 -08:00
zfs-inherit.8 Reorganize zfs(8) man page into sections 2019-11-12 11:17:40 -08:00
zfs-jail.8 Add FreeBSD jail support hooks 2019-12-11 11:58:37 -08:00
zfs-list.8 Reorganize zfs(8) man page into sections 2019-11-12 11:17:40 -08:00
zfs-load-key.8 Document zfs change-key caveats 2020-01-14 10:11:07 -08:00
zfs-mount-generator.8.in Systemd mount generator: Generate noauto units; add control properties 2020-02-14 15:32:55 -08:00
zfs-mount.8 Add notice that forcefully unmount is not supported on Linux 2020-02-18 13:36:23 -08:00
zfs-program.8 Support setting user properties in a channel program 2020-02-14 13:41:42 -08:00
zfs-project.8 Reorganize zfs(8) man page into sections 2019-11-12 11:17:40 -08:00
zfs-projectspace.8 Reorganize zfs(8) man page into sections 2019-11-12 11:17:40 -08:00
zfs-promote.8 Reorganize zfs(8) man page into sections 2019-11-12 11:17:40 -08:00
zfs-receive.8 Deprecate deduplicated send streams 2020-03-18 13:31:10 -07:00
zfs-recv.8 Reorganize zfs(8) man page into sections 2019-11-12 11:17:40 -08:00
zfs-redact.8 Reorganize zfs(8) man page into sections 2019-11-12 11:17:40 -08:00
zfs-release.8 Reorganize zfs(8) man page into sections 2019-11-12 11:17:40 -08:00
zfs-rename.8 Reorganize zfs(8) man page into sections 2019-11-12 11:17:40 -08:00
zfs-rollback.8 Reorganize zfs(8) man page into sections 2019-11-12 11:17:40 -08:00
zfs-send.8 Deprecate deduplicated send streams 2020-03-18 13:31:10 -07:00
zfs-set.8 Reorganize zfs(8) man page into sections 2019-11-12 11:17:40 -08:00
zfs-share.8 Reorganize zfs(8) man page into sections 2019-11-12 11:17:40 -08:00
zfs-snapshot.8 Reorganize zfs(8) man page into sections 2019-11-12 11:17:40 -08:00
zfs-unallow.8 Reorganize zfs(8) man page into sections 2019-11-12 11:17:40 -08:00
zfs-unjail.8 Add FreeBSD jail support hooks 2019-12-11 11:58:37 -08:00
zfs-unload-key.8 Reorganize zfs(8) man page into sections 2019-11-12 11:17:40 -08:00
zfs-unmount.8 Reorganize zfs(8) man page into sections 2019-11-12 11:17:40 -08:00
zfs-upgrade.8 Reorganize zfs(8) man page into sections 2019-11-12 11:17:40 -08:00
zfs-userspace.8 Reorganize zfs(8) man page into sections 2019-11-12 11:17:40 -08:00
zfs.8 Implement bookmark copying 2020-02-11 13:19:12 -08:00
zfsconcepts.8 Reorganize zfs(8) man page into sections 2019-11-12 11:17:40 -08:00
zfsprops.8 Change default to overlay=on 2020-03-06 09:28:19 -08:00
zgenhostid.8 Correct man page dates 2019-05-08 10:59:32 -07:00
zinject.8 Multiple DVA Scrubbing Fix 2019-03-15 14:14:31 -07:00
zpool-add.8 Reorganize zpool(8) man page into sections 2019-11-13 09:21:07 -08:00
zpool-attach.8 Reorganize zpool(8) man page into sections 2019-11-13 09:21:07 -08:00
zpool-checkpoint.8 Reorganize zpool(8) man page into sections 2019-11-13 09:21:07 -08:00
zpool-clear.8 Reorganize zpool(8) man page into sections 2019-11-13 09:21:07 -08:00
zpool-create.8 Reorganize zpool(8) man page into sections 2019-11-13 09:21:07 -08:00
zpool-destroy.8 Reorganize zpool(8) man page into sections 2019-11-13 09:21:07 -08:00
zpool-detach.8 Reorganize zpool(8) man page into sections 2019-11-13 09:21:07 -08:00
zpool-events.8 Reorganize zpool(8) man page into sections 2019-11-13 09:21:07 -08:00
zpool-export.8 Add notice that forcefully unmount is not supported on Linux 2020-02-18 13:36:23 -08:00
zpool-get.8 Reorganize zpool(8) man page into sections 2019-11-13 09:21:07 -08:00
zpool-history.8 Reorganize zpool(8) man page into sections 2019-11-13 09:21:07 -08:00
zpool-import.8 Reorganize zpool(8) man page into sections 2019-11-13 09:21:07 -08:00
zpool-initialize.8 Reorganize zpool(8) man page into sections 2019-11-13 09:21:07 -08:00
zpool-iostat.8 Reorganize zpool(8) man page into sections 2019-11-13 09:21:07 -08:00
zpool-labelclear.8 Reorganize zpool(8) man page into sections 2019-11-13 09:21:07 -08:00
zpool-list.8 Reorganize zpool(8) man page into sections 2019-11-13 09:21:07 -08:00
zpool-offline.8 Reorganize zpool(8) man page into sections 2019-11-13 09:21:07 -08:00
zpool-online.8 Reorganize zpool(8) man page into sections 2019-11-13 09:21:07 -08:00
zpool-reguid.8 Reorganize zpool(8) man page into sections 2019-11-13 09:21:07 -08:00
zpool-remove.8 Reorganize zpool(8) man page into sections 2019-11-13 09:21:07 -08:00
zpool-reopen.8 Reorganize zpool(8) man page into sections 2019-11-13 09:21:07 -08:00
zpool-replace.8 Reorganize zpool(8) man page into sections 2019-11-13 09:21:07 -08:00
zpool-resilver.8 Reorganize zpool(8) man page into sections 2019-11-13 09:21:07 -08:00
zpool-scrub.8 Reorganize zpool(8) man page into sections 2019-11-13 09:21:07 -08:00
zpool-set.8 Reorganize zpool(8) man page into sections 2019-11-13 09:21:07 -08:00
zpool-split.8 Reorganize zpool(8) man page into sections 2019-11-13 09:21:07 -08:00
zpool-status.8 Reorganize zpool(8) man page into sections 2019-11-13 09:21:07 -08:00
zpool-sync.8 Reorganize zpool(8) man page into sections 2019-11-13 09:21:07 -08:00
zpool-trim.8 Add trim support to zpool wait 2020-03-04 15:07:11 -08:00
zpool-upgrade.8 Reorganize zpool(8) man page into sections 2019-11-13 09:21:07 -08:00
zpool-wait.8 Add trim support to zpool wait 2020-03-04 15:07:11 -08:00
zpool.8 Fix ZPOOL_VDEV_NAME_PATH option description 2020-01-06 10:43:32 -08:00
zpoolconcepts.8 Reorganize zpool(8) man page into sections 2019-11-13 09:21:07 -08:00
zpoolprops.8 Reorganize zpool(8) man page into sections 2019-11-13 09:21:07 -08:00
zstreamdump.8 Eliminate useless double-bolding in man pages 2019-04-24 17:04:35 -07:00