[dizzzzz]

HI,

I have P570, there is need to make 1 LV accessible to 2 LPARS.

it's now mapped to 1 LPAR
when i try the same way map it to another LPAR (mkvdev ) i get error message that 1 LV can be mapped only to 1 virstual scsi adaptor.
Does anybody has idea how to do this ?

[cdelgadop]

Hi

you can make one Volume Group (VM) accessible to two LPARS, so all Logical Volumes (LV) belonging to that VG can be seen by those two LPARS.

You can do that with SAN based disks (LUNs) by assigning the same LUN device to both LPAR's zone configurations. But you want to do it at VIOS level so you will need to modify the reservation policy of those VIOS SCSI adapters to no reserve to you can map in the another VIOS LPAR.

developerWorks : AIX and UNIX : Virtualization Forum : VIO servers and EMC SAN disks need help ...

Hope this helps

[Administrator]

Just don't allow them to write to the LV at same time or you'll have a mess on your hands.

[ross.mather]

You cannot allow two disk backing devices to be accessed from 2 LPARS using the same VIO servers. You get the error message you have just described.

As you are using LVs there is no way to get what you want.

cdelgadop's comments on reservation policy is for LUNs allocated via I/O servers and not a logical volume. He is right though that if it was a full LUN and each LPAR had its own Fibre Connections you could do it that way,

This is done deliberately to avoid the kinds of mess the Adminstrator is suggesting.

If two LPARS both need to access the data concurrently then you are looking at GPFS. Information on that is here:

http://publib.boulder.ibm.com/infocenter/clresctr/vxrx/topic/com.ibm.cluster.gpfs.doc/gpfs_faqs/gpfsclustersfaq.pdf

If its for an HACMP environment then you still have a single point of failure in the Server you are located in.

The alternative option is to mount the LV in one LPAR and access via NFS on a private virtual network to the other LPAR - as you are on one box.