AIX VIO vs multipath

Posted on 2011-10-28
Medium Priority
Last Modified: 2013-11-17
What is the differnce between VIO and multipath in AIX ?
will a server with 2 VIO's has problems with Oracle asm disks if they still have the pvid?
Question by:it-rex
LVL 68

Accepted Solution

woolmilkporc earned 2000 total points
ID: 37044973
VIO and multipath are not (closely) related.

VIO in regard to disks means the concept of making disk resources available to a logical partition over virtual SCSI adapters and Virtual I/O Server(s). Only the VIO machine(s) need(s) real I/O, the mapping between real disks (or logical volumes on those disks) and the client disks (or what it sees as "disks") is done by VIO and PowerVM hypervisor functionalities.

MPIO is the concept of accessing disks over multiple (load-balanced or failover-enabled or both) paths.

To bring both concepts together - you can indeed configure two or more VIO servers to make the same real disk(s) available to a single client partition over two or more virtual SCSI connections, and this client partition will then use MPIO to manage these multiple paths to the same device.

I'm not aware of any problems with Oracle ASM - the client will assume one "real" disk regardless of the number of paths to it due to MPIO, and will see one PVID.


LVL 11

Author Closing Comment

ID: 37045226
great thanks

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