This document describes the steps required to replace both of the faulty HDD drives in a server in an Ultra-M setup that hosts StarOS Virtual Network Functions (VNFs).
Ultra-M is a pre-packaged and validated virtualized mobile packet core solution designed to simplify the deployment of VNFs. OpenStack is the Virtualized Infrastructure Manager (VIM) for Ultra-M and consists of these node types:
Object Storage Disk - Compute (OSD - Compute)
OpenStack Platform - Director (OSPD)
The high-level architecture of Ultra-M and the components involved are depicted in this image:
This document is intended for the Cisco personnel familiar with Cisco Ultra-M platform and it details the steps required to be carried out at OpenStack and CPS VNF level at the time of the Controller Server Replacement.
Note: Ultra M 5.1.x release is considered in order to define the procedures in this document.
Virtual Network Function
Elastic Service Controller
Method of Procedure
Object Storage Disks
Hard Disk Drive
Solid State Drive
Virtual Infrastructure Manager
Ultra Automation Services
Universally Unique IDentifier
Both HDD Failure
1. Each Baremetal server will be provisioned with two HDD drives to act as BOOT DISK in Raid 1 configuration. In case of single HDD failure, since there is RAID 1 level redundancy, the faulty HDD drive can be hot swapped. But when both the HDD drives fail, the server will be down and the access to the server will be lost. So, to restore the access to the server and the services, it is required to replace both the HDD drives and add the server to the existing overcloud stack.
3. In case of both HDD failure, replace only these two faulty HDDs in the same UCS 240M4 server. BIOS upgrade procedure is not required after you replace new disks.
4. In OpenStack based (Ultra-M) solution, UCS 240M4 Baremetal server can take up one of these roles: Compute, OSD-Compute, Controller and OSPD. The steps required in order to handle both HDD failures in each of these server roles are mentioned in these sections.
Note: In scenarios where both HDD disks are healthy but some other hardware is faulty in UCS 240M4 server, replace the UCS 240M4 with new hardware but re-use the same HDD drives. However, in this case, if only the HDD drives are faulty, re-use the same UCS 240M4 and replace faulty HDD drives with new HDD drives.