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Update extent size information in vgchange and vgcreate man pages

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Alasdair Kergon 2006-04-06 21:15:14 +00:00
parent 823a36448f
commit 76f97cd75d
3 changed files with 38 additions and 9 deletions
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1
WHATS_NEW
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@ -1,5 +1,6 @@
Version 2.02.03 -
===================================
Update extent size information in vgchange and vgcreate man pages.
Introduce origin_from_cow().
pvremove without -f now fails if there's no PV label.
Support lvconvert -s.

23
man/vgchange.8
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@ -17,6 +17,8 @@ vgchange \- change attributes of a volume group
.RB [ \-l | \-\-logicalvolume
.IR MaxLogicalVolumes ]
.RB [ \-P | \-\-partial]
.RB [ \-s | \-\-physicalextentsize
.IR PhysicalExtentSize [ \fBkKmMgGtT\fR ]]
.RB [ -t | \-\-test]
.RB [ \-v | \-\-verbose]
.RB [ \-\-version ]
@ -59,6 +61,27 @@ exclusively because they can only be used on one node at once.
Changes the maximum logical volume number of an existing inactive
volume group.
.TP
.BR \-s ", " \-\-physicalextentsize " " \fIPhysicalExtentSize\fR[\fBkKmMgGtT\fR]
Changes the physical extent size on physical volumes of this volume group.
A size suffix (k for kilobytes up to t for terabytes) is optional, megabytes
is the default if no suffix is present.
The default is 4 MB and it must be at least 1 KB and a power of 2.
Before increasing the physical extent size, you might need to use lvresize,
pvresize and/or pvmove so that everything fits. For example, every
contiguous range of extents used in a logical volume must start and
end on an extent boundary.
If the volume group metadata uses lvm1 format, extents can vary in size from
8KB to 16GB and there is a limit of 65534 extents in each logical volume. The
default of 4 MB leads to a maximum logical volume size of around 256GB.
If the volume group metadata uses lvm2 format those restrictions do not apply,
but having a large number of extents will slow down the tools but have no
impact on I/O performance to the logical volume. The smallest PE is 1KB.
The 2.4 kernel has a limitation of 2TB per block device.
.TP
.BR \-x ", " \-\-resizeable { y | n }
Enables or disables the extension/reduction of this volume group
with/by physical volumes.

23
man/vgcreate.8
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@ -59,17 +59,22 @@ as described in \fBpvcreate(8)\fP.
.BR \-s ", " \-\-physicalextentsize " " \fIPhysicalExtentSize\fR[\fBkKmMgGtT\fR]
Sets the physical extent size on physical volumes of this volume group.
A size suffix (k for kilobytes up to t for terabytes) is optional, megabytes
is the default if no suffix is present. Values can be from 8 KB to 16 GB in
powers of 2. The default is 4 MB.
is the default if no suffix is present.
The default is 4 MB and it must be at least 1 KB and a power of 2.
Once this value has been set, it is difficult to change it without recreating
the volume group which would involve backing up and restoring data on any
logical volumes.
If the volume group metadata uses lvm1 format, there is a limit of 65534
extents in each logical volume, so the default of 4 MB leads to a maximum
logical volume size of around 256GB.
If the volume group metadata uses lvm2 format there is no such restriction,
although having a large number of extents will slow down
the tools but have no impact on I/O performance to the logical volume.
logical volumes. However, if no extents need moving for the new
value to apply, it can be altered using vgchange \-s.
If the volume group metadata uses lvm1 format, extents can vary in size from
8KB to 16GB and there is a limit of 65534 extents in each logical volume. The
default of 4 MB leads to a maximum logical volume size of around 256GB.
If the volume group metadata uses lvm2 format those restrictions do not apply,
but having a large number of extents will slow down the tools but have no
impact on I/O performance to the logical volume. The smallest PE is 1KB.
The 2.4 kernel has a limitation of 2TB per block device.
.SH EXAMPLES
To create a volume group named