vgcreate



VGCREATE(8)                                                        VGCREATE(8)




NAME

       vgcreate - create a volume group


SYNOPSIS

       vgcreate  [--addtag  Tag]  [--alloc  AllocationPolicy] [-A|--autobackup
       {y|n}] [-d|--debug] [-h|--help] [-l|--maxlogicalvolumes  MaxLogicalVol-
       umes]  [-M|--metadatatypetype] [-p|--maxphysicalvolumes MaxPhysicalVol-
       umes]      [-s|--physicalextentsize       PhysicalExtentSize[kKmMgGtT]]
       [-t|--test]  [-v|--verbose]  [--version]  VolumeGroupName  PhysicalVol-
       umePath [PhysicalVolumePath...]


DESCRIPTION

       vgcreate creates a new volume group called  VolumeGroupName  using  the
       block  special  device PhysicalVolumePath previously configured for LVM
       with pvcreate(8).


OPTIONS

       See lvm for common options.

       -l, --maxlogicalvolumes MaxLogicalVolumes
              Sets the maximum number of logical volumes allowed in this  vol-
              ume  group.  The setting can be changed with vgchange.  For vol-
              ume groups with metadata in lvm1 format, the limit  and  default
              value  is  255.   If  the metadata uses lvm2 format, the default
              value is 0 which removes this  restriction:  there  is  then  no
              limit.

       -p, --maxphysicalvolumes MaxPhysicalVolumes
              Sets  the  maximum number of physical volumes that can belong to
              this volume group.  The setting can be  changed  with  vgchange.
              For  volume  groups  with metadata in lvm1 format, the limit and
              default value is 255.  If the metadata  uses  lvm2  format,  the
              default value is 0 which removes this restriction: there is then
              no limit.  If you have a large number of physical volumes  in  a
              volume  group with metadata in lvm2 format, for tool performance
              reasons, you should consider some use of --metadatacopies  0  as
              described in pvcreate(8).

       -s, --physicalextentsize PhysicalExtentSize[kKmMgGtT]
              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.   Once this value has been set, it is difficult to change
              it without recreating the volume group which would involve back-
              ing 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 vol-
              ume.  The 2.4 kernel has a limitation of 2TB per block device.


EXAMPLES

       To  create  a  volume  group  named  test_vg  using  physical   volumes
       /dev/hdk1, and /dev/hdl1 with default physical extent size of 4MB:

            vgcreate test_vg /dev/sdk1 /dev/sdl1



SEE ALSO

       lvm(8),  pvdisplay(8),  pvcreate(8),  vgdisplay(8),  vgextend(8), vgre-
       duce(8), lvcreate(8), lvdisplay(8), lvextend(8), lvreduce(8)



Sistina Software UK                LVM TOOLS                       VGCREATE(8)

Man(1) output converted with man2html