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man: update lvcreate with sparse

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Document sparse device creation and its default segtype selection.
This commit is contained in:
Zdenek Kabelac 2014-10-30 19:44:42 +01:00
parent e6e647489d
commit 651613e9a4
1 changed files with 14 additions and 8 deletions
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22
man/lvcreate.8.in
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@ -155,7 +155,7 @@ Normally the \fB\-\-zero\fP \fIn\fP argument has to be supplied too because
zeroing (the default behaviour) also requires activation.
If autoactivation option is used (\fB\-a\fIay\fR), the logical volume is
activated only if it matches an item in the
.BR activation / auto_activation_volume_list
.IR activation / auto_activation_volume_list
set in \fBlvm.conf\fP(5).
For autoactivated logical volumes, \fB\-\-zero\fP \fIn\fP and
\fB\-\-wipesignatures\fP \fIn\fP is always assumed and it can't
@ -291,7 +291,9 @@ The default is "\fIraid1\fP". See the
legacy "\fImirror\fP" segment type. See
.BR lvm.conf (5)
settings
.BR global / mirror_segtype_default
.IR global / mirror_segtype_default
and
.IR global / raid10_segtype_default
to configure default mirror segment type.
The options
\fB\-\-mirrorlog\fP and \fB\-\-corelog\fP apply
@ -316,9 +318,9 @@ Starts or avoids monitoring a mirrored, snapshot or thin pool logical volume wit
dmeventd, if it is installed.
If a device used by a monitored mirror reports an I/O error,
the failure is handled according to
.BR activation / mirror_image_fault_policy
.IR activation / mirror_image_fault_policy
and
.BR activation / mirror_log_fault_policy
.IR activation / mirror_log_fault_policy
set in \fBlvm.conf\fP(5).
.TP
.IR \fB\-n ", " \fB\-\-name " " LogicalVolume { Name | Path }
@ -531,8 +533,12 @@ or
Default type is \fIlinear\fP.
.TP
.BR \-V ", " \-\-virtualsize " " \fIVirtualSize [ \fIbBsSkKmMgGtTpPeE ]
Creates a sparse device of the given size (in MiB by default) using a snapshot
or thinly provisioned device when thin pool is specified.
Creates a thinly provisioned device or a sparse device of the given size (in MiB by default).
See
.BR lvm.conf (5)
settings
.IR global / sparse_segtype_default
to configure default sparse segment type.
See \fBlvmthin\fP(7) for more info about thin provisioning support.
Anything written to a sparse snapshot will be returned when reading from it.
Reading from other areas of the device will return blocks of zeros.
@ -546,12 +552,12 @@ Controls wiping of detected signatures on newly created Logical Volume.
If this option is not specified, then by default signature wiping is done
each time the zeroing (\fB\-Z\fP/\fB\-\-zero\fP) is done. This default behaviour
can be controlled by
.BR allocation / wipe_signatures_when_zeroing_new_lvs
.IR allocation / wipe_signatures_when_zeroing_new_lvs
setting found in
.BR lvm.conf (5).
.br
If blkid wiping is used
.BR allocation / use_blkid_wiping
.IR allocation / use_blkid_wiping
setting in
.BR lvm.conf (5))
and LVM2 is compiled with blkid wiping support, then \fBblkid\fP(8) library is used