Reorganize zpool(8) man page into sections

Moved subcommand topics into individual manpages. Reordered and 
grouped the list of subcommands by topic.

Moved concepts overview to `zpoolconcepts.8` and the long list of
available pool properties to `zpoolprops.8`.

Internal cross-references copied from `zpool.8` needed to be 
converted to `.Xr` external references to new subcommand manual 
pages.

Move `autotrim` into lexical order, autotrim tacked onto the end
of a list. Now it is in alphabetical order.

Clarify attach/detach description. Description was too specific to
command syntax. Overview clarifies reason for attaching or detaching
a device.

Clarify replace description, don't refer to subcommand arguments.

Clarify split command description, say what split actually does and
why you'd want to do it.

Clarify description of upgrade, and simplify the zpool.8 wording of
the zpool-upgrade(8) description.

Clarify description of import, detail what zpool-import(8) actually 
does.

Add appropriate SEE ALSO sections. Divided zpool subcommand manual 
pages need their own SEE ALSO sections. Also modified fsck.zfs.8 
to point directly to zfs-scrub.8 and zed.8.in to include a direct
reference to zfs-events.8

Reviewed-by: Matt Ahrens <[email protected]>
Reviewed-by: Kjeld Schouten <[email protected]>
Reviewed-by: Brian Behlendorf <[email protected]>
Signed-off-by: Ross Williams <[email protected]>
Closes #9564 

1 files changed, 124 insertions, 0 deletions

diff --git a/man/man8/zpool-split.8 b/man/man8/zpool-split.8
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+.\"
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+.\" Copyright (c) 2007, Sun Microsystems, Inc. All Rights Reserved.
+.\" Copyright (c) 2012, 2018 by Delphix. All rights reserved.
+.\" Copyright (c) 2012 Cyril Plisko. All Rights Reserved.
+.\" Copyright (c) 2017 Datto Inc.
+.\" Copyright (c) 2018 George Melikov. All Rights Reserved.
+.\" Copyright 2017 Nexenta Systems, Inc.
+.\" Copyright (c) 2017 Open-E, Inc. All Rights Reserved.
+.\"
+.Dd August 9, 2019
+.Dt ZPOOL-SPLIT 8
+.Os Linux
+.Sh NAME
+.Nm zpool Ns Pf - Cm split
+.Nd Split devices off a ZFS storage pool creating a new pool
+.Sh SYNOPSIS
+.Nm
+.Cm split
+.Op Fl gLlnP
+.Oo Fl o Ar property Ns = Ns Ar value Oc Ns ...
+.Op Fl R Ar root
+.Ar pool newpool
+.Oo Ar device Oc Ns ...
+.Sh DESCRIPTION
+.Bl -tag -width Ds
+.It Xo
+.Nm
+.Cm split
+.Op Fl gLlnP
+.Oo Fl o Ar property Ns = Ns Ar value Oc Ns ...
+.Op Fl R Ar root
+.Ar pool newpool
+.Op Ar device ...
+.Xc
+Splits devices off
+.Ar pool
+creating
+.Ar newpool .
+All vdevs in
+.Ar pool
+must be mirrors and the pool must not be in the process of resilvering.
+At the time of the split,
+.Ar newpool
+will be a replica of
+.Ar pool .
+By default, the
+last device in each mirror is split from
+.Ar pool
+to create
+.Ar newpool .
+.Pp
+The optional device specification causes the specified device(s) to be
+included in the new
+.Ar pool
+and, should any devices remain unspecified,
+the last device in each mirror is used as would be by default.
+.Bl -tag -width Ds
+.It Fl g
+Display vdev GUIDs instead of the normal device names. These GUIDs
+can be used in place of device names for the zpool
+detach/offline/remove/replace commands.
+.It Fl L
+Display real paths for vdevs resolving all symbolic links. This can
+be used to look up the current block device name regardless of the
+.Pa /dev/disk/
+path used to open it.
+.It Fl l
+Indicates that this command will request encryption keys for all encrypted
+datasets it attempts to mount as it is bringing the new pool online. Note that
+if any datasets have a
+.Sy keylocation
+of
+.Sy prompt
+this command will block waiting for the keys to be entered. Without this flag
+encrypted datasets will be left unavailable until the keys are loaded.
+.It Fl n
+Do dry run, do not actually perform the split.
+Print out the expected configuration of
+.Ar newpool .
+.It Fl P
+Display full paths for vdevs instead of only the last component of
+the path. This can be used in conjunction with the
+.Fl L
+flag.
+.It Fl o Ar property Ns = Ns Ar value
+Sets the specified property for
+.Ar newpool .
+See the
+.Xr zpoolprops
+manual page for more information on the available pool properties.
+.It Fl R Ar root
+Set
+.Sy altroot
+for
+.Ar newpool
+to
+.Ar root
+and automatically import it.
+.El
+.El
+.Sh SEE ALSO
+.Xr zpool-import 8 ,
+.Xr zpool-list 8 ,
+.Xr zpool-remove 8