Message-ID: <d593f33f.0205122148.dfd6f58@posting.google.com>

Check for HBA with dual-ported disks 

    from the boot prom:

Note you should reset system  before probing it

       ok> reset-all


       ok> probe-scsi-all

    For example:

       ok> probe-scsi-all
       /pci@6,4000/scsi@3,1

       /pci@6,4000/scsi@3
       Target 2
       Unit 0   Disk     Disk Vendor
       Target 3
       Unit 0   Disk     Disk Vendor

       /pci@6,4000/scsi@2,1
       Target 2
       Unit 0   Disk     Disk Vendor
       Target 3
       Unit 0   Disk     Disk Vendor

    Identify which disks are the dual-hosted disk and note the
    SCSI adaptors they are attached to.  Using the above example, one
    connection would be "/pci@6,4000/scsi@3" and the other
    "/pci@6,4000/scsi@2,1"


 2) Update the nvramrc to set the scsi-initiator-id to 6 for these 
device.

    From the boot prom type:

       ok> nvedit
       0: probe-all install-console banner
       1: cd /pci@6,4000/scsi@3
       2: 6 " scsi-initiator-id" integer-property
       3: device-end
       4: cd /pci@6,4000/scsi@2,1
       5: 6 " scsi-initiator-id" integer-property
       6: device-end

 3) Store the nvramrc.

    From the boot prom type:

       ok>nvstore

 4) Evaluate the nvramrc:

    From the boot prom type:

       ok>nvramrc evaluate

 5) Set the system to use the nvramrc:

    From the boot prom type:

       ok>setenv use-nvramrc? true

 6) Do a reset:

    From the boot prom type:

       ok>reset-all


 7) Edit the /etc/system file (on both nodes) to set fast/wide SCSI
    (disable Ultra SCSI):

    set scsi_options=0x3f8


 8) Boot both systems and verify that you can see the multi-hosted 
    disks from both nodes.

Message-ID: <1021590517.52281@nntp1.acecape.com>

>Great but how about file locking ?
>does it work automagically ?

No file locking. You need to use disk suite disk sets or
Veritas Volume Manager disk groups to control access if
you want to try something like this (not that I would
recommend it)