[linux-lvm] How do I properly backup and restore / on LVM2

[Alan Pek]

Hi Folks,

Read through the doc and tried to create a snapshot lv for rootlv by 
doing, but failed. 

singmrecfp1001:~ # lvcreate -L 2.5g -s -n rsnap rootvg
  Path required for Logical Volume "rootvg"
  The origin name should include the volume group.
  lvcreate: Create a logical volume
lvcreate
        [-A|--autobackup {y|n}]
        [--addtag Tag]
        [--alloc AllocationPolicy]
        [-C|--contiguous {y|n}]
        [-d|--debug]
        [-h|-?|--help]
        [-i|--stripes Stripes [-I|--stripesize StripeSize]]
        {-l|--extents LogicalExtentsNumber |
         -L|--size LogicalVolumeSize[kKmMgGtT]}
        [-M|--persistent {y|n}] [--major major] [--minor minor]
        [-m|--mirrors Mirrors]
        [-n|--name LogicalVolumeName]
        [-p|--permission {r|rw}]
        [-r|--readahead ReadAheadSectors]
        [-R|--regionsize MirrorLogRegionSize]
        [-t|--test]
        [--type VolumeType]
        [-v|--verbose]
        [-Z|--zero {y|n}]
        [--version]
        VolumeGroupName [PhysicalVolumePath...]

lvcreate -s|--snapshot
        [-c|--chunksize]
        [-A|--autobackup {y|n}]
        [--addtag Tag]
        [--alloc AllocationPolicy]
        [-C|--contiguous {y|n}]
        [-d|--debug]
        [-h|-?|--help]
        [-i|--stripes Stripes [-I|--stripesize StripeSize]]
        {-l|--extents LogicalExtentsNumber |
         -L|--size LogicalVolumeSize[kKmMgGtT]}
        [-M|--persistent {y|n}] [--major major] [--minor minor]
        [-n|--name LogicalVolumeName]
        [-p|--permission {r|rw}]
        [-r|--readahead ReadAheadSectors]
        [-t|--test]
        [-v|--verbose]
        [--version]
        OriginalLogicalVolume[Path] [PhysicalVolumePath...]


singmrecfp1001:~ # lvcreate -L 2.5g -s -n rsnap /dev/mapper/rootvg-rootlv
  Volume group "mapper" doesn't exist

singmrecfp1001:~ #  lvcreate -L 2.5g -s -n rsnap /dev/md1
  "/dev/md1": Invalid path for Logical Volume
  The origin name should include the volume group.
  lvcreate: Create a logical volume

lvcreate
        [-A|--autobackup {y|n}]
        [--addtag Tag]
        [--alloc AllocationPolicy]
        [-C|--contiguous {y|n}]
        [-d|--debug]
        [-h|-?|--help]
        [-i|--stripes Stripes [-I|--stripesize StripeSize]]
        {-l|--extents LogicalExtentsNumber |
         -L|--size LogicalVolumeSize[kKmMgGtT]}
        [-M|--persistent {y|n}] [--major major] [--minor minor]
        [-m|--mirrors Mirrors]
        [-n|--name LogicalVolumeName]
        [-p|--permission {r|rw}]
        [-r|--readahead ReadAheadSectors]
        [-R|--regionsize MirrorLogRegionSize]
        [-t|--test]
        [--type VolumeType]
        [-v|--verbose]
        [-Z|--zero {y|n}]
        [--version]
        VolumeGroupName [PhysicalVolumePath...]

lvcreate -s|--snapshot
        [-c|--chunksize]
        [-A|--autobackup {y|n}]
        [--addtag Tag]
        [--alloc AllocationPolicy]
        [-C|--contiguous {y|n}]
        [-d|--debug]
        [-h|-?|--help]
        [-i|--stripes Stripes [-I|--stripesize StripeSize]]
        {-l|--extents LogicalExtentsNumber |
         -L|--size LogicalVolumeSize[kKmMgGtT]}
        [-M|--persistent {y|n}] [--major major] [--minor minor]
        [-n|--name LogicalVolumeName]
        [-p|--permission {r|rw}]
        [-r|--readahead ReadAheadSectors]
        [-t|--test]
        [-v|--verbose]
        [--version]
        OriginalLogicalVolume[Path] [PhysicalVolumePath...]


singmrecfp1001:~ #


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