Apr
15

NOS 4.0 – When is it safe to upgrade the hypevisor?

Prior to NOS 4.0 you had to run a the NCLI (Nutanix Command Line) if you wanted to check the cluster status if you were rebooting the CVM’s (Controller Virtual Machine) when upgrading the Hypervisor.

Today it’s front and center.

Nutanix

How many hosts you can take down before the cluster is impacted.

By clicking on the image you get lots of information that may be affecting the fault domains of the cluster. That information includes:

Fault Domain Type: Component

Extent Groups – Based on placement of extent group replicas the cluster can tolerate a maximum of X node failure(s)

Oplop – Based on the placement of oplog episodes the cluster can tolerate a maximum of X node failure(s)

Metadata – All metadata ring partitions are fault tolerant

Free Space – Cluster has enough free space (X TB) to tolerate X node failure(s)

Fault Domain Type: Block

Extent Groups – Rackable unit aware data placement is disabled – Not enough rackable units in the cluster (Need 3 blocks for availability domains to work)

Oplog – Rackable unit aware data placement is disabled – Not enough rackable units in the cluster

Metadata – Metadata ring partitions with nodes: X,X,X,X are not fault tolerant.

ZooKeeper – Rackable unit aware Zookeeper placement is disabled – Not enough rackable units in the cluster
Free Space – Rackable unit aware data placement is disabled – Not enough rackable units in the cluster

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