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How your system is affected when you apply a hotfix

Contributors netapp-lhalbert
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You must understand how your StorageGRID system will be affected when you apply a hotfix.

StorageGRID hotfixes are non-disruptive

The StorageGRID system can ingest and retrieve data from client applications throughout the hotfix process. If you approve all nodes of the same type to hotfix (for example, Storage Nodes), the nodes are brought down one at a time, so there is no time when all grid nodes or all grid nodes of a certain type are unavailable.

To allow for continued availability, ensure that your ILM policy contains rules that specify storing multiple copies of each object. You must also ensure that all external S3 or Swift clients are configured to send requests to one of the following:

  • A high availability (HA) group virtual IP address

  • A high availability third-party load balancer

  • Multiple Gateway Nodes for each client

  • Multiple Storage Nodes for each client

Client applications might experience short-term disruptions

The StorageGRID system can ingest and retrieve data from client applications throughout the hotfix process; however, client connections to individual Gateway Nodes or Storage Nodes might be disrupted temporarily if the hotfix needs to restart services on those nodes. Connectivity will be restored after the hotfix process completes and services resume on the individual nodes.

You might need to schedule downtime to apply a hotfix if loss of connectivity for a short period is not acceptable. You can use selective approval to schedule when certain nodes are updated.

Note You can use multiple gateways and high availability (HA) groups to provide automatic failover during the hotfix process. See the instructions for configuring high availability groups.

Alerts and SNMP notifications might be triggered

Alerts and SNMP notifications might be triggered when services are restarted and when the StorageGRID system is operating as a mixed-version environment (some grid nodes running an earlier version, while others have been upgraded to a later version). In general, these alerts and notifications will clear when the hotfix completes.

Configuration changes are restricted

When applying a hotfix to StorageGRID:

  • Don't make any grid configuration changes (for example, specifying Grid Network subnets or approving pending grid nodes) until the hotfix has been applied to all nodes.

  • Don't update the ILM configuration until the hotfix has been applied to all nodes.