topic Re: de activate the inactive cores - how to in Operating System - HP-UX

de activate the inactive cores - how to

silusan — Fri, 30 Nov 2012 02:56:37 GMT

How can we de activate the inactive cores in a superdome(ia64 hp superdome server SD32B)

Local nPartition Status
-----------------------
Total number of configured cores:                                           24
Number of Intended Active cores:                                             3
Number of active cores:                                                      3
Number of inactive cores:                                                   21
Additional cores that can be activated with current usage rights:            1
Number of cores that could be activated with additional usage rights:       12
Number of cores that can be activated with temporary capacity:               0
Number of cores that are deconfigured or attached to inactive cells:         8

Temporary capacity available: (negative) <a few thousand>days, 14 hours, 0 minutes

We have a code to reduce this negative capacity to zero days.

Before applying that we need to deactivate the cores.

# icapmodify -d 21

Does the abover command suffice or do I need to identify the cores to be de activated ?

Thanks

P.S. This thread has been moved from HP-UX > Virtualization to HP-UX > Workload/Resource Management - HP forums Moderator

Re: de activate the inactive cores - how to

Torsten. — Fri, 30 Nov 2012 07:12:26 GMT

A complete "icapstatus" output will probably give more information.

Re: de activate the inactive cores - how to

silusan — Wed, 05 Dec 2012 17:50:46 GMT

vmhost1 has 4 guests - off, with one v cpu each - 10% entitlement

vmhost2 also has 4 guests - off, with one vCPU each - 10% entitlement

vpar rack1 has four vpars - off

vpar rack2 has four vpars - off

vmhost 1:/ # icapmodify -s 1

ERROR: A minimum of 2 cores must always be active on this system.

This request would result in fewer than the minimum number of

cores being active.

vmhost1:/ #

same is the error we get on vmhost 2

What we intend to do ....

we have code to apply, which makes negative TCAp to zero days.

before that we want to make 10 RTUs in spare.

Assign just one core to each nPar (total four nPars)

apply code to make tcap = 0

then transfer RTU licenses to another superdome.

but we are stuck at making intended active cores to 1 in all these nPars.

vPars wont boot after we made intended actual core=1. ( do we need to delete three vpars from each vpar rack)?

Start CIM cimserver subsystem ....................................... OK

Initialize Instant Capacity ......................................... BOOT
ERROR: This virtual partition is not being allowed to boot because doing
   so would take the complex out of compliance from an Instant Capacity
   perspective. The number of cores assigned to this vPar database (/stand/vpdb)
   exceeds the number of intended active cores by 3. To correct this,
   boot this partition back into an nPartition and modify the vPars assigned
   to this database or modify the number of intended active cores for this
   nPartition.

Re: de activate the inactive cores - how to

Torsten. — Thu, 06 Dec 2012 07:17:15 GMT

Looks like your system is using ICAp CPUs or even cells. Usually you have to pay in order to use them. If HP give you steps to do anything, you should contact them if you have problems.
Remember, each cell needs an active CPU. If you want to have a single CPU per nPar, you need to remove the other cells from the nPar.