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
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.gitignore	Ignore *.o.ur-safe build artifacts	2018-05-13 18:59:02 -07:00
fsck.zfs.8	Reorganize zpool(8) man page into sections	2019-11-13 09:21:07 -08:00
Makefile.am	Systemd mount generator: Generate noauto units; add control properties	2020-02-14 15:32:55 -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