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Here is a list of issues (and hopefully resolutions) encountered while getting Linux-HA to run on an OpenPower 720:

1. Sharing DASD between two LPARs
   1. Shut down all affected LPARs, including Virtual I/O Server
   2. On HMC, create two virtual SCSI server adapters for Virtual I/O Server LPAR with unique slot numbers (i.e. 31 and 41)
   3. On HMC, create a virtual SCSI client adapter for each Linux LPAR that connects to the slot numbers from previous step (i.e. VIO.31 on first LPAR, VIO.41 on second)
   4. Activate Virtual I/O Server LPAR and login
   5. Assign the same backing DASD to both of the newly created vhosts using different device names; for example (assuming dasdvg volume group exists, shared data is to be 20GB, and vhost5 and vhost6 represent slots 31 and 41, respectively):
      • mklv -lv my_shared_data dasdvg 20G mkvdev -vdev my_shared_data -vadapter vhost5 -dev dev_LPAR1_shared mkvdev -vdev my_shared_data -vadapter vhost6 -dev dev_LPAR2_shared
   6. Activate both Linux LPARs and login
   7. From first Linux LPAR (assuming shared data will be JFS partition on /dev/sdb):
      • mkfs.jfs /dev/sdb mkdir /shared_data mount -t jfs /dev/sdb /shared_data

        echo Hello shared world! > /shared_data/my_file umount /dev/sdb

   8. From second Linux LPAR (again assuming shared data will be JFS partition on /dev/sdb):
      • mkdir /shared_data mount -t jfs /dev/sdb /shared_data blockdev --flushbufs /dev/sdb cat /shared_data/my_file
   Hopefully at this point "Hello shared world!" is displayed on your terminal.
2. HMC and VIOS command complexity

   Command line syntax for both the HMC and Virtual I/O Server are extremely complex. See for yourself, here is the 1375-line script used to setup the LPARs on the HMC (LWE-HMCScript.sh) and here is the 300-line script used to setup the LPARs' virtual Ethernet and SCSI adapters on the VIOS (LWE-VIOSScript.sh).

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