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 = HA-NFS =
 * Highly Available NFS with DRBD and Pacemaker

 * Ubuntu 10.04 Lucid 2.6.32-30-generic-pae
  * mdadm 2.6.7.1-1ubuntu15
  * lvm2 2.02.54-1ubuntu4.1
  * drbd8-utils 2:8.3.7-1ubuntu2.1
  * nfs-kernel-server 1:1.2.0-4ubuntu4.1
  * pacemaker 1.0.8+hg15494-2ubuntu2

 * Tested with VMware Workstation 7.1.3

 == DRBD on LVM with RAID1 ==
 * Primary
  * /dev/sd[bc]1 -> /dev/md0 (RAID1)
  * /dev/md0 -> /dev/vgnfs/drbd (LVM)
 * Secondary
  * /dev/sdb1 -> /dev/vgnfs/drbd (LVM)

 * 全体図
{{{
                             drbd/Primary (ubuntu-haa)
           --------------------------------------------------------------
           |                   -------------------------                |
           |               sda | system[ / ]  |  swap  |                |
           |                   -------------------------                |
           |                                                            |
  NIC(192.168.234.101)      sdb                     sdc                 |
   ||      |   ||      --------------          --------------           |
   ||      ----||------|            |----------|            |------------
   ||          ||      |   Linux    |          |   Linux    |
   ||          ||      |   raid     |          |   raid     |
   ||          ||      | autodetect<=== RAID1 ==>autodetect |
   ||          ||      |------------|    |     |------------|
   ||          ||      --------------    |     --------------
   ||          ||                        |
   ||          ||             ----------LVM----------
   ||          ||             |                 |   |
   ||          ======================drbd       |*1 |  *1: snapshot
   ||                         |                 |   |
   ||                         -----------------------
   ||
   ||
   ||
   ||
   ||
   ||         drbd/Secondar (ubuntu-hab)
   ||      -----------------------------------
   ||      |      -------------------------  |
   ||      |  sda | system[ / ]  |  swap  |  |
   ||      |      -------------------------  |
   ||      |                                 |
  NIC(192.168.234.102)      sdb              |
           |   ||      |------------|        |
           ----||------|            |---------
               ||      |    LVM     |
               ||      |            |----|
               ||      |------------|    |
               ||      --------------    |
               ||                        |
               ||             ----------LVM----------
               ||             |                 |   |
               ======================drbd       |*1 |  *1: snapshot
                              |                 |   |
                              -----------------------
}}}