diff options
Diffstat (limited to 'man/pvcreate.8')
| -rw-r--r-- | man/pvcreate.8 | 67 |
1 files changed, 62 insertions, 5 deletions
diff --git a/man/pvcreate.8 b/man/pvcreate.8 index 681e3978..5bec86fd 100644 --- a/man/pvcreate.8 +++ b/man/pvcreate.8 @@ -7,8 +7,15 @@ pvcreate \- initialize a disk or partition for use by LVM .RB [ \-f [ f ]| \-\-force " [" \-\-force ]] .RB [ \-y | \-\-yes ] .RB [ \-h | \-\-help ] +.RB [ \-t | \-\-test ] .RB [ \-v | \-\-verbose ] -.RB [ \-V | \-\-version ] +.RB [ \-\-labelsector ] +.RB [ \-M | \-\-metadatatype type ] +.RB [ \-\-metadatacopies #copies ] +.RB [ \-\-metadatasize size ] +.RB [ \-\-restorefile file ] +.RB [ \-\-setphysicalvolumesize size ] +.RB [ \-\-version ] .IR PhysicalVolume " [" PhysicalVolume ...] .SH DESCRIPTION .B pvcreate @@ -17,7 +24,7 @@ initializes for later use by the Logical Volume Manager (LVM). Each .I PhysicalVolume can be a disk partition, whole disk, meta device, or loopback file. -For DOS disk partitions, the partition id must be set to 0x8e using +For DOS disk partitions, the partition id should be set to 0x8e using .BR fdisk "(8), " cfdisk "(8), " or a equivalent. For .B whole disk devices only @@ -47,11 +54,61 @@ In an emergency you can override this behaviour with -ff. Specify the uuid for the device. Without this option, \fBpvcreate\fP generates a random uuid. All of your physical volumes must have unique uuids. -You need to use this option to restore a backup of LVM metadata onto -a replacement device - see \fBvgcfgrestore\fP(8). +You need to use this option before restoring a backup of LVM metadata +onto a replacement device - see \fBvgcfgrestore\fP(8). .TP .BR \-y ", " \-\-yes Answer yes to all questions. +.SH NEW METADATA OPTIONS +LVM2 introduces a new format for storing metadata on disk. +This new format is more efficient and resilient than the format the +original version of LVM used and offers the advanced user greater +flexibility and control. +.sp +The new format may be selected on the command line with \fB-M2\fP or by +setting \fBformat = "lvm2"\fP in the \fBglobal\fP section of \fBlvm.conf\fP. +Each physical volume in the same volume group must use the same format, but +different volume groups on a machine may use different formats +simultaneously: the tools can handle both formats. +Additional formats can be added as shared libraries. +.sp +Additional tools for manipulating the locations and sizes of metadata areas +will be written in due course. Use the verbose/debug options on the tools +to see where the metadata areas are placed. +.TP +.BR \-\-metadatasize " size" +The approximate amount of space to be set aside for each metadata area. +(The size you specify may get rounded.) +.TP +.BR \-\-metadatacopies " copies" +The number of metadata areas to set aside on each PV. Currently +this can be 0, 1 or 2. +If set to 2 (the default), two copies of the volume group metadata +are held on the PV, one at the front of the PV and one at the end. +If set to 1, one copy is kept at the front of the PV (starting in the +5th sector). +If set to 0, no copies are kept on this PV - you might wish to use this +with VGs containing large numbers of PVs. But if you do this and +then later use \fBvgsplit\fP you must ensure that each VG is still going +to have a suitable number of copies of the metadata after the split! +.TP +.BR \-\-restorefile " file" +In conjunction with \fB--uuid\fP, this extracts the location and size +of the data on the PV from the file (produced by \fBvgcfgbackup\fP) +and ensures that the metadata that the program produces is consistent +with the contents of the file i.e. the physical extents will be in +the same place and not get overwritten by new metadata. This provides +a mechanism to upgrade the metadata format or to add/remove metadata +areas. Use with care. See also \fBvgconvert\fP(8). +.TP +.BR \-\-labelsector " sector" +By default the PV is labelled with an LVM2 identifier in its second +sector (sector 1). This lets you use a different sector near the +start of the disk (between 0 and 3 inclusive - see LABEL_SCAN_SECTORS +in the source). Use with care. +.TP +.BR \-\-setphysicalvolumesize " size" +Overrides the automatically-detected size of the PV. Use with care. .SH Example Initialize partition #4 on the third SCSI disk and the entire fifth SCSI disk for later use by LVM: @@ -61,4 +118,4 @@ SCSI disk for later use by LVM: .SH SEE ALSO .BR lvm "(8), " vgcreate "(8), " vgextend "(8), " lvcreate "(8), " .BR cfdisk "(8), " fdisk "(8), " losetup "(8), " mdadd "(8), " -.BR vgcfgrestore "(8)" +.BR vgcfgrestore "(8), " vgconvert "(8)" |