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===== Logical Volume Manager =====
==== Creating logical volumes ====
   1. enter lsdev -C -c disk to check disks available
   2. create volume group using: mkvg -y "vgname" hdiskn
   3. enter varyonvg vgname
   4. To create logical volume enter:mklv -y "lvname volgrp n
      e.g.mklv -y "testlv1" testvg 64 - will create a logical volume called
      testlv1 in volume group testvg of 64 logical partitions (to check the
      size of the physical partitions, run lsvg vgname)
   5. To create a mirrored logical volume enter:mklv -y "lvname -c n volgrp n
      disk1 disk2
      e.g.mklv -y "testlv2" -c 2 testvg 64 hdisk1 hdisk2 - will create a
      logical volume called testlv2 in volume group testvg with 2 copies of the
      64 logical partitions on disks hdisk1 and hdisk2
   6. create filesystem by entering crfs -v jfs -l lvname -m /mountdir -A yes
      This will dreate a filesystem the same size as the logical volume, create
      the mount directory and include the filesystem in /etc/filesystems so it
      will be automatically mounted when the system is rebooted.
==== Extending logical volumes ====
   1. enter extendlv lvname size - to extend the named logical volumes by the
      number of physical partitions named by the size parameter
   2. enter chfs -a size=+size /mountpoint - where size is in 512 byte blocks
      (can calculate this by (PP * 1000000)/512 ) and mountpoint is the
      physical mountpoint of the logical volume
==== Some useful LVM commands ====
    * lspv - list all disks on the system
    * lsvg - list all volume groups on the system
    * lsvg -l "vgname" - list all logical volumes in volume group
    * lsfs - list all filesystems in the system
    * mklvcopy -k lvname 2 pvname - will create a mirror copy of the named logical volume on named disk
    * lslv -m lvname - can be used to check logical volume mirrors
    * savevg - backup entire volume group, e.g.

      savevg -i volgrp /dev/rmt1

    * restvg - restore from savevg backup
    * mirrorvg - mirror an entire volume group, e.g.

      mirrorvg -s rootvg


  
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