mastering_zfs/ch07

ch07

dz / mastering_zfs / ch07

Summary

Chapter 7: Snapshots and Clones

Node Tree

clone
snapshot
zfs_cli

Nodes

snapshot
content	snapshot
children	accessing, automatic_snapshot_regimen, bookmarks, copy_on_write, creating_snaps, deleting, diffing, fork_fs_snap, holds, keeps_track_version_blocks (how it works), list_of_blocks, mounting, read_only, recursive_snaps, revert, underpin_repl, using, view

read_only
content	read-only
parents	snapshot

underpin_repl
content	Underpinnings of replication in ZFS
parents	snapshot

copy_on_write
content	Copy-on-Write
children	change_file_identify_blocks (how it works), never_overwrites_blocks
parents	snapshot

clone
content	clone
children	clone_create, clone_delete, clone_view, fork_fs_snap (description), fork_of_fs, initially_no_disk_space, new_fs_from_snap (description), promoting, receive_no_updates_from_dataset, writable

fork_fs_snap
content	Fork of filesystem based on snapshot
parents	clone, snapshot

never_overwrites_blocks
content	ZFS never overwrites blocks
parents	copy_on_write

change_file_identify_blocks
content	When a change is made to a file, it identifies the changed blocks, then copies those blocks to a new location
children	keeps_track_version_blocks
parents	copy_on_write

keeps_track_version_blocks
content	created by keeping track of deduplicated versions of changed blocks
parents	snapshot, change_file_identify_blocks

creating_snaps
content	Creating
children	copies_fs_top_block, dead_list
parents	snapshot

copies_fs_top_block
content	copies filesystem top-level metadata block
children	live_uses_copy_snap_orig
parents	creating_snaps

dead_list
content	dead list
children	block_freed_when, delete_snap_update_deadlist
parents	creating_snaps

live_uses_copy_snap_orig
content	Live system uses copy, snap shot uses original
parents	copies_fs_top_block

delete_snap_update_deadlist
content	Deleting the most recent snapshot will update the deadlist. It will remove blocks that were only required by that snapshot.
parents	dead_list

block_freed_when
content	Block is only freed when no filesystem, volume, or snapshot is using it.
parents	dead_list

list_of_blocks
content	List of blocks used inthe live dataset when snapshot was taken.
parents	snapshot

zfs_cli
content	zfs
children	zfs_clone, zfs_clone_destroy, zfs_destroy, zfs_diff, zfs_list, zfs_list_t_snapshot, zfs_promote, zfs_rollback, zfs_snapshot

mounting
content	Mounting
parents	snapshot

deleting
content	deleting
children	dry_runs, range, recursive
parents	zfs_destroy, snapshot

zfs_destroy
content	destroy
children	dash_n, dash_r, dash_vn, deleting
parents	zfs_cli

dash_n
content	-n
children	dry_runs
parents	zfs_destroy

dash_vn
content	-vn
children	dry_runs (a little bit more verbose)
parents	zfs_destroy

dry_runs
content	Dry Runs
parents	dash_vn, deleting, dash_n

recursive
content	recursive
parents	dash_r, deleting

dash_r
content	-r
children	recursive, recursive_snaps (snapshot -r)
parents	zfs_destroy, zfs_snapshot

range
content	range
children	range_notation (notation(ish))
parents	deleting

range_notation
content	[from snapshot] % [to snapshot[
parents	range

revert
content	revert
children	only_rollback_most_recent
parents	zfs_rollback, snapshot

only_rollback_most_recent
content	Can only roll back to most recent snapshot. No forward/backward
parents	revert

zfs_rollback
content	rollback
children	revert
parents	zfs_cli

diffing
content	Diffing
children	file_states
parents	zfs_diff, snapshot

zfs_diff
content	diff
children	diffing, file_states
parents	zfs_cli

file_states
content	File States
children	state_added, state_modified, state_removed, state_renamed
parents	diffing, zfs_diff

state_removed
content	"-" = removed
parents	file_states

state_added
content	"+" = added
parents	file_states

state_modified
content	"M" = modified
parents	file_states

state_renamed
content	"R" = renamed
parents	file_states

holds
content	Holds
parents	snapshot

automatic_snapshot_regimen
content	automatic snapshot regimen
parents	snapshot

bookmarks
content	bookmarks
parents	snapshot

using
content	using
children	create
parents	snapshot

create
content	create
parents	zfs_snapshot, using

zfs_snapshot
content	snapshot
children	create, dash_r
parents	zfs_cli

view
content	view
children	by_type, control_output, per_snap_space_use, scriptable_output
parents	zfs_list_t_snapshot, snapshot

zfs_list_t_snapshot
content	zfs list -t snapshot
children	view
parents	zfs_cli

zfs_list
content	list
children	dash_o, dash_p, dash_t
parents	zfs_cli

recursive_snaps
content	recursive snapshots
parents	dash_r, snapshot

by_type
content	by type
parents	view, dash_t

dash_t
content	-t
children	by_type, zfs_all, zfs_snapshot_option
parents	zfs_list

control_output
content	control_output
parents	view, dash_o

dash_o
content	-o
children	control_output, written_prop
parents	zfs_list

scriptable_output
content	scriptable output
parents	view, dash_p

dash_p
content	-p
children	scriptable_output
parents	zfs_list

zfs_all
content	all
parents	dash_t

zfs_snapshot_option
content	snapshot
parents	dash_t

per_snap_space_use
content	per-snapshot space use
children	written_prop
parents	view

written_prop
content	"written" property
parents	dash_o, per_snap_space_use

accessing
content	accessing
children	snapdir
parents	snapshot

snapdir
content	snapshot directory/snapdir
children	snapdir_prop
parents	accessing

snapdir_prop
content	snapdir property
children	hidden, visible
parents	snapdir

visible
content	visible
parents	snapdir_prop

hidden
content	hidden
parents	snapdir_prop

new_fs_from_snap
content	new filesystem created from snapshot
parents	clone

writable
content	writable
parents	clone

fork_of_fs
content	fork or branch of filesystem
parents	clone

initially_no_disk_space
content	no disk space initially
parents	clone

receive_no_updates_from_dataset
content	receives no updates made in original dataset
parents	clone

clone_create
content	creating
parents	clone, zfs_clone

zfs_clone
content	clone
children	clone_create
parents	zfs_cli

clone_view
content	viewing
children	origin_prop_tells_if_clone
parents	clone

origin_prop_tells_if_clone
content	the "origin" property is the only way to tell if it is clone or not
parents	clone_view

clone_delete
content	deleting
children	clone_exists_prevents_snap_removal
parents	clone, zfs_clone_destroy

clone_exists_prevents_snap_removal
content	Existence of clone prevents source snap from being deleted
parents	clone_delete, dash_big_r

zfs_clone_destroy
content	destroy
children	clone_delete, dash_big_r
parents	zfs_cli

dash_big_r
content	-R
children	clone_exists_prevents_snap_removal (removes dependent clones)
parents	zfs_clone_destroy

promoting
content	promoting
children	reverse_parent_child
parents	clone

reverse_parent_child
content	reverse parent/child relationship original/clone
parents	promoting

zfs_promote
content	promote
parents	zfs_cli