Forum Discussion
mshoaib
Cirrus
CirrusAdding New BigIP Units Using Free CPUs on i7800 (LB13 & LB14) to an existing HA Pair
Hello, We have a pair of i7800 devices, each running two guests with the following configuration: i7800 Unit 1: LB09 & LB11 i7800 Unit 2: LB10 & LB12 Current Setup: LB09 & LB10: These are par...
Hi mshoaib,
To my understanding i7800 supports only 12 vCPU not 14 vCPU, as per written in f5 Documentation.
Can you please check again and share the vCMP host , and number of vCPU supported, is it 12 or is it 14.
Please refer:
https://my.f5.com/manage/s/article/K14218
https://wtit.com/f5-resources/vcmp-guest-memory-cpu-core-allocation-matrix/
Please mark it as solution in case if you feel your query has been responded and saved your time and giving pointers toward resolving your issue, as it will help other to use your query scenario to solve their similar issue.
Best Regards,
F5 Design Engineer
Hi mshoaib,
About your questions:
- Can we bring up new BigIP units (LB13 & LB14) using the 2 free CPUs on each i7800 unit? Yes it´s possible, this link shows you the Possible vCPU allocation per guest per slot/appliance https://my.f5.com/manage/s/article/K14218
- Can these new units join the existing HA pair of LB11 & LB12 and sync configuration to each other? Yes, it´s possible, but in the case of the fail of the nodes LB11 & LB12 with 6 CPUs, is possible new LB13 & LB14 in the traffic group can´t support the load with only 2 CPU.
- Can the new Units serve their own traffic groups ( as shown below in the diagram ) ? Yes, you can select the preferred device to run the traffic, and the failover order in case something fails.
- Is there any potential limitation or issue with utilizing the remaining CPUs for this purpose? No, the VCMP is a virtualization platform so you can use all the resources available, take in mind that the system has its exclusive CPUs to run the F5-VCMP system.
- Will i7800 run out of memory or go low in memory ?No, the same answer as the last one for this topic.
About your goals.
- Offload 20% of the traffic (a handful of VIPs) to the newly created LB13 & LB14 units. In my opinion is better if you deploy the new devices without introducing them to the existing traffic group, and then you can migrate the applications to these new devices.
- All LBxx ( 11,12,13 & 14 ) should back each other up and sync configuration across. As I mentioned, in the case of a failure in nodes 11,12, the load couldn´t be supported for nodes 13 and 14.
Hope it works.
mshoaibCirrus
CirrusThank you Sebastiansierra for the detail response.
As you mentioned, vCMP has dedicated CPUs for running the system. Do you think the two CPUs shown after the initial 12 are the ones reserved for vCMP? Another user also mentioned that the i7800 model supports only 12 CPUs, rather than 14.
Hi mshoaib,
The VCMP Guest menu only shows you the available CPU to be deployed, so you can create a new VCMP guest without worrying because these devices are designed to run 1 vcmp guest with 1, 2, 4, or 6 CPU and a maximum of 12 VCMP guest, please review this article
https://my.f5.com/manage/s/article/K14218
In the case you open a support case, they probably redirect you to the same article.