When it comes to certification exams, part of the process is going through the blueprint provided by Cisco and making a best guess at where to focus your time. Cisco provides a percentage to give an idea of where to focus your time. These notes fall into section four of the 642-999 Exam Blueprint - Provision Cisco UCS Compute Resources.
[alert-announce]This post is another in my series about the 642-999 DCUCI CCNP Data Center exam. It is not intended to be an all encompassing post, however a collection of the notes I have gathered during my studies. [/alert-announce]
Service Profiles hold all of the ingredients to provision a server. They contain identity and state information, which includes vUUIDs, vNIC, vHBA information and policy based information (boot order, scrub policies, etc.). Each compute node must have a service profile, allowing us to create a stateless compute instance.
There are two types of Service Profiles - stateful and stateless. Stateful service profiles tie the options to the specific server they are applied to. A Stateless profile allows us to use resource pools instead of tying configuration options to a specific server. To create a stateless service profile, you must use expert mode.
Expert Service Profile Wizard
The UCS Manager Service Profile wizard will walk you through creating a service profile. In expert mode, this wizard asks for the proper UUID, NIC, and storage resource pools to use for the Service Profile. You can also reference policies to further automate the wizard.
Service Profile Changes
The following service profile changes will force a server to reboot:
- Identity Changes
- Boot Targets
- Failover policies
The following are non-disruptive changes:
- VSAN Changes
- VLAN Changes
- Changing an access VLAN to Trunked
Service Profile Templates
Service profile templates allow you to automate the creation of service profiles. There are two types of templates, Initial and Updating.
Initial Templates - Templates used to create a service profile and then cut ties with the service profile template. Changes to the template will not pass down to the SP
Updating Templates - Updating templates are tied to the template. Therefore, when you update the template it will update all of the active service profiles as well.
Updating Templates make your service profiles read only, but can be dangerous. If a MAC pool is changed on an updating template, all blades would reboot to apply the new service profile.