How to differentiate between a standalone LPAR and a VIOC (which again is a lpar)? Post: 302949916

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Operating Systems AIX How to differentiate between a standalone LPAR and a VIOC (which again is a lpar)? Post 302949916 by blackrageous on Friday 17th of July 2015 01:33:56 PM

07-17-2015

Registered User

I have never heard the term standalone LPAR. The very name Logical Paritition means it is not a physical contruct. An IBM stand alone server is a physical entity that cannot be partitioned (these are usually older models, current models with appropriate licensing support virtualization). Perhaps you mean the case where an IBM server that supports partitioning has only 1 LPAR that has all they physical resources. A VIOS (virtual IO server) is a custom LPAR that can be used to give other LPARS virtual resources. The VIOS is assigned the physical resources of the IBM server (like a physical adapter) and then the VIOS can create a virtual adapter (like vSCSI) and map it to a client LPAR.

The "real magic" in Virtual Based systems is what is know as the hypervisor. IBM servers support PHYP and OpenKVM (for linux OpenPower). The hypervisor is a layer between physical resources of a server and the logical partitons (LPARS).

---------- Post updated at 12:33 ---------- Previous update was at 12:27 ----------

about the prtconf command:, a physical system would return "-1 NULL"

-L
Displays LPAR partition number and partition name if this is an LPAR partition, otherwise returns
"-1 NULL".

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LEARN ABOUT NETBSD

viomb

VIOMB(4)						   BSD Kernel Interfaces Manual 						  VIOMB(4)

NAME

     viomb -- VirtIO memory ballooning driver

SYNOPSIS

     virtio* at pci? dev ? function ?
     viomb*  at virtio?

DESCRIPTION

     virtio(4) defines an interface for efficient, standard, and extensible I/O between the hypervisor and the virtual machine.  The viomb driver
     supports the virtio-compliant memory ballooning device.

     Memory ballooning works as follows:

     1.   The host operator requests a guest to return some amount of memory to the host (via e.g. Qemu monitor balloon command).
     2.   The hypervisor sends the request via VirtIO memory ballooning device.
     3.   The guest viomb driver requests allocation of that amount of physical memory from the NetBSD memory management system.
     4.   The viomb device tells the hypervisor the guest physical memory address of the allocated memory via VirtIO memory ballooning device.

     The sysctl node hw.viomb.npages shows the requested number of memory pages to return to the hypervisor, while hw.viomb.actual shows the
     actual number of memory pages that are already returned to the hypervisor.

SEE ALSO

     virtio(4), sysctl(8)

     Rusty Russell, IBM Corporation, Virtio PCI Card Specification, http://ozlabs.org/~rusty/virtio-spec/.

HISTORY

     The viomb device driver appeared in NetBSD 6.0.

BUGS

     The userland interface should be same as the Xen ballooning device.

BSD
								 November 26, 2011							       BSD

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