hpvm & vpar

[WW451512]

Hi All,

What is the difference between vPar and hpvm in terms of sharing of resources?

Any links describing differences between hpvm and vpar?

Thanks

[Kapil Jha]

Basically difference is in the way hardware is assigned to the vPar or HPVM.
vPar would have its own hardware like CPU, memory from a nPar but in HPVM all the VM can share the CPU.

There are so many difference it would be better if you read manuals vpar and hpvm to understand how they work.

BR,
Kapil+

[Torsten.]

The basics are totally different.
With vPars each virtual partition has its own resources, not shared.

With HPVM the host owns all of the resources, they can be assigned to the guests and can be shared too.

I suggest to review the introduction chapters of vPars and HPVM manuals for more details.


http://www.hp.com/go/hpux-vpars-docs

http://www.hp.com/go/hpux-hpvm-docs

[WW451512]

Thanks for your replies.

Another doubt..
1. Is it possible to share a resource (say DVD drive) simultaneously among VM guests?

2. If not, is possible to assign it from one guest to another without restaring the related guests.

Thanks Again.

[Eric SAUBIGNAC]

Bonjour,

1) Yes, provided that the attribut SHAREABLE=YES is activated with hpvmdevmgmt. But if you can share simultaneously, I don't know what's happen if you use it simultaneously.

2) You can dynamically assign devices to a VM provided you already have a device assigned to the VM on the same virtual bus/device. For example if you want to assign a cdrom at virtual hardware path 3,2,4 (Bus 3, device 2, target 4), you can do it on line if you have a compatible device assigned to bus 3, device 2, for exemple 3,2,1

Eric

[Bhadresh]

Virtual partitions (vPars) are separate operating system instances on the same nPartition or server, with O/S, application and resource isolation.

Integrity Virtual machines have their own separate 'guest' operating system instances, on the same nPartition or server, with different OSs, versions, applications and users, in a fully isolated environment. Integrity Virtual Machines software provides shared processor (with sub-core granularity), shared I/O and dynamic resource allocation based on demand and entitlement.

HP Integrity Virtual Machines (Integrity VM) â an extension of the existing Partitioning Continuum that blends the benefits of HP-UX Virtual Partitions (vPars) and HP Process Resource Manager (PRM). Virtual partitions allow you to create partitions to the granularity of the hardware (CPU, I/O card) with each partition running its own version of an operating system.

Have a look at following:
http://h71028.www7.hp.com/enterprise/downloads/Intro_VM_WP_12_Sept%2005.pdf

http://docs.hp.com/en/7948/VparToVMMigration.pdf

Regards,
Bhadresh

[Bhadresh · Accepted solution]

>>> Is it possible to share a resource (say DVD drive) simultaneously among VM guests?
Yes, you can share DVD drive simultaneously among VM guests.

If multiple guests need to share devices, then the SHARE attribute for those devices must be changed to SHARE=YES using the modify option (-m) with the hpvmdevmgmt command.

For example, to make the HP-UX iso.* images shareable so that two virtual machines (host1
and host2) can use them to install at the same time, enter the following commands:
# hpvmdevmgmt -m gdev:/var/opt/hpvm/ISO-images/hpux/:attr:SHARE=YES
# hpvmmodify -P host1 -a dvd:scsi::null:/var/opt/hpvm/ISO-images/hpux/
# hpvmmodify -P host2 -a dvd:scsi::null:/var/opt/hpvm/ISO-images/hpux/

Have a look at the section 9.9 of HPVM installation guide for more details:
http://bizsupport1.austin.hp.com/bc/docs/support/SupportManual/c02023903/c02023903.pdf

Regards,
Bhadresh

[WW451512]

Thanks to all..