Online upgrade support for protocols and performance monitoring

Online upgrade support for protocol nodes depends on which services are enabled and deployed. Different protocol services have different levels of online upgrade support.

• NFS: If there are different NFS versions on protocol nodes in a cluster, then performing an online upgrade on one node at a time can be tolerated. .
• SMB: All protocol nodes running the SMB service must have the same version installed at any time. In addition, to a brief outage of the SMB service, this also requires a brief outage of the NFS service in case Active Directory (AD) authentication is being used. SMB upgrade in an IBM Storage Scale cluster is done in two phases. The protocol nodes in the cluster are divided in two halves and SMB is upgraded on each half one by one.
• Object: All object nodes must be at the same level as object operations interact with all nodes. Therefore, object services need to be stopped across the cluster for the duration of the upgrade. Other protocol services can continue to be run.
• Performance monitoring: Having two different versions on collector nodes will result in a loss of communication and could potentially result in missing performance metrics until collector versions match. This limitation is not applicable if the source and the target versions are later than 5.0.1.