Licensing : VPU needed ?
A user planning to run Informix 11.50 Ultimate in a VM asked whether he must license 2 or 4 cores when assigning virtual cores on a 4-core host. Responses pointed to IBM's PVU calculator and sub-capacity licensing FAQ/guide documents, and clarified that under IBM-supported sub-capacity licensing you license the PVUs only for the virtual CPUs actually assigned to the VM (2 in his case). Art Kagel also warned that VM I/O throughput can be roughly half that of bare metal, so VMs may be unsuitable for heavy OLTP/DW workloads, and advised using an up-to-date hypervisor. The poster was satisfied.
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Hello, I want to install Informix 11.50 ultimate on a virtual machine, and i will give 4 virtual cores for informix. knowing that 1 physical core = 2 virtual cores, how many cores i need to purshase 2 or 4 ? thanks in advance
The calculation of the VPU depends on the processor, the IBM computer can be found here: https://www-112.ibm.com/software/howtobuy/passportadvantage/valueunitcalculator/ vucalc.wss To understand the sub-capacity licensing, you can look at these two sites: http://www-01.ibm.com/software/lotus/passportadvantage/subcapfaqov.html ftp://ftp.software.ibm.com/software/smb/pdfs/SubcapacityGuide.pdf Greetings. Paolo Il 28/02/2014 10:47, SMITH JOHN ha scritto: > Hello, > > I want to install Informix 11.50 ultimate on a virtual machine, and i will > give 4 virtual cores for informix. > > knowing that 1 physical core = 2 virtual cores, how many cores i need to > purshase 2 or 4 ? > > thanks in advance > > > ******************************************************************************* > Forum Note: Use "Reply" to post a response in the discussion forum. >
What do you mean by "1 physical core = 2 virtual cores"? Do you mean that you are assigning 4 virtual cores but the physical machine only has two physical cores or are you just making a logical equivalency saying that it takes two virtual cores to perform like a single physical core? Art Art S. Kagel, Principal Consultant ASK Database Management Blog: http://informix-myview.blogspot.com/ Disclaimer: Please keep in mind that my own opinions are my own opinions and do not reflect on the IIUG, nor any other organization with which I am associated either explicitly, implicitly, or by inference. Neither do those opinions reflect those of other individuals affiliated with any entity with which I am affiliated nor those of the entities themselves. On Fri, Feb 28, 2014 at 4:47 AM, SMITH JOHN <daylight@webmails.com> wrote: > Hello, > > I want to install Informix 11.50 ultimate on a virtual machine, and i will > give 4 virtual cores for informix. > > knowing that 1 physical core = 2 virtual cores, how many cores i need to > purshase 2 or 4 ? > > thanks in advance > > > > ******************************************************************************* > Forum Note: Use "Reply" to post a response in the discussion forum. > > --001a1132f47cb7f9c304f375abc4
thanks, very useful
the machine has 4 physical cores, and i want to use only 2. but i i also need to understand if it has only 2 physical
OK, so, you have to license the PVUs for the two virtual CPUs that are assigned to the VM. That is called sub-capacity licensing and is supported by IBM. FYI, PLEASE be aware that IO performance under virtual machines is about 50% of the IO rate for the same machine and storage system using bar iron and the same OS. So, if this is a high transaction rate OLTP server or a large DW server that will be performing complex analytics, I would strongly recommend against using a VM. The VM will be fine if you can live within its IO limitations otherwise. Also if you are using Vmware, make sure you are using the latest VSphere hypervisor. IO performance under the older hypervisors, or without one, is much worse. Art Art S. Kagel, Principal Consultant ASK Database Management Blog: http://informix-myview.blogspot.com/ Disclaimer: Please keep in mind that my own opinions are my own opinions and do not reflect on the IIUG, nor any other organization with which I am associated either explicitly, implicitly, or by inference. Neither do those opinions reflect those of other individuals affiliated with any entity with which I am affiliated nor those of the entities themselves. On Fri, Feb 28, 2014 at 6:32 AM, SMITH JOHN <daylight@webmails.com> wrote: > the machine has 4 physical cores, and i want to use only 2. > but i i also need to understand if it has only 2 physical > > > > ******************************************************************************* > Forum Note: Use "Reply" to post a response in the discussion forum. > > --001a11c3ce322c032104f375ed0e
Thanks a lot for your precious help and advices