In Dell EMC PowerScale clusters, upgrades can be performed using different methods, each with its
own impact on cluster availability and performance.
Simultaneous Upgrade:
Definition:
A simultaneous upgrade involves rebooting all nodes in the cluster at the same time.
Characteristics:
The entire cluster is taken offline during the upgrade process.
Downtime is required, making it suitable for non-production environments or maintenance windows.
Why Other Options Are Incorrect:
Rolling Upgrade (Option B):
Nodes are upgraded one at a time, allowing the cluster to remain online.
Side-by-Side Upgrade (Option C):
Involves building a new cluster and migrating data; nodes are not rebooted simultaneously.
In-Place Upgrade (Option D):
Refers to upgrading software on the existing hardware but does not imply simultaneous reboots.
Dell PowerScale Reference:
Dell EMC PowerScale OneFS Upgrade Guide:
Chapter on Upgrade Methods:
Describes simultaneous upgrades and their impact on cluster availability.
Provides guidelines on when to choose this method.
Best Practices:
Schedule simultaneous upgrades during planned downtime.
Notify users of the expected service interruption.
