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тАО01-31-2008 12:38 PM
тАО01-31-2008 12:38 PM
Thanks
Solved! Go to Solution.
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тАО01-31-2008 12:45 PM
тАО01-31-2008 12:45 PM
Re: difference between vpar and npar
vPar is a softer hard partition, the partitions are not electically isolated but assignment of specifically IO is by LBA ( i.e. by card) a failure of a component could effect another vPar.
I am sure there is a better way to explain. Most likely in the book :)
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тАО01-31-2008 11:03 PM
тАО01-31-2008 11:03 PM
Re: difference between vpar and npar
Npar : Hard partitioning - Partitioned at SBA level -Hardware failure won't affect the other partition
VPar : Soft Patitioning - Partitioned at LBA level : Hardware failure can affect other partition - Software failure wont affect other partition.
Thanks & Regards
Ramesh
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тАО02-01-2008 12:45 AM
тАО02-01-2008 12:45 AM
SolutionEssentials things have been said. Some precisions.
You can have partitionning nPar and/or vPar only with mid-range or high-end boxes, from RX7.../RP7.... to superdome.
nPars ares are electrically isolated from each others. So you can't tink to them in term of independant boxes though they share the same complex.
With nPars granularity is weak : you can't share a cell or an IO chassis between 2 nPars.
You can build vPar in an nPar. An intermediate software between hardware and kernel, /stand/vpmon, will manage nPar hardware and devide it in units to vPar.
Granularity is better : for IO, partionning is done on LBA, you can think to it in term of slot, for CPU it's the core itself, and for memory you can divide to Mo.
For both technologies theres is no sharing of any ressources. They can be used with PA-RISC or Itanium architectures.
There is now a third technology : HP Integrity Virtual Machines. It is Itanium specific and it works on all boxes, from the lowest end to the highest.
This technology permits sharing of ressources like CPU, IO cards, ... If you have heard of VMWare ESX, it's about the same idea ... less enhanced for the moment :-( In ESX the hypervisor is a Linux OS, with Integrity VM it's HP-UX 11iv2.
In an Integrity VM guest, you can have different OS : HP-UX 11iv2, 11iv3, Windows Itanium 64 bits, Linux RH and SL.
You can have HP Integrity VM in an nPar, not in a vPar.
"Would appreciate a short summary rather than been given pdf links." I can understand that but you will find more detailled informations in documentations ;-)
Regards
Eric
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тАО02-01-2008 12:49 AM
тАО02-01-2008 12:49 AM
Re: difference between vpar and npar
"So you can't tink to them in term of independant boxes though they share the same complex"
you must read :
"So you CAN think to them in term of independant boxes though they share the same complex"
No point needed for this clarification
Eric
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тАО02-01-2008 03:16 AM
тАО02-01-2008 03:16 AM
Re: difference between vpar and npar
http://docs.hp.com/en/T1335-90083/ch02s01.html
(it's not a pdf-link)
;-)
Hope this helps!
Regards
Torsten.
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тАО02-01-2008 07:59 AM
тАО02-01-2008 07:59 AM
Re: difference between vpar and npar
I can guarentee you on a rp74xx that with either nPar or vPar in place if you have a VRM ( Voltage Regulator Module ) failure the entire server will come down.
Has happened three times to three different servers over the last 3 years ( hmmm.. 3 must not be a lucky number ).
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тАО02-04-2008 01:39 PM
тАО02-04-2008 01:39 PM
Re: difference between vpar and npar
Actually, when using vpars, you can share the CPU resources either by manually moving the processors or using WLM to monitor and move CPU resources automatically. I have seen an implementation where they shared CPU across npars using GWLM. This effectively used ICOD processors that GWLM turned on and off depending on the dynamics of the load.
Rob...
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тАО02-06-2008 10:55 AM
тАО02-06-2008 10:55 AM
Re: difference between vpar and npar
You are perfectly right to underline that we can move CPU ressources between vPars belonging to the same nPar and simulate this move between nPars through deactivation / activation of core cpu unit.
When I said that "theres is no sharing of any ressources" I meant that you can't have nPars or vPars that use at the SAME MOMENT the SAME RESOURCE vs VM technology.
It was just to clarify my post, nothing else, and of course, KHILARI, no point for this post (more exactly assign 0 point to it)
Best regards
Eric