Dell PowerStore Importing External Storage to PowerStore Guide

Single fault

Any single fault in the middle of an import is handled without any impact to host I/Os as described in the following examples:

• If the destination loses the back-end connection with the source system in the SAN path during a non-disruptive import, the import is automatically canceled by the PowerStore import orchestrator. I/Os from the host are redirected back to the source. In most situations, this process occurs without any I/O disruption. However, the import fails and must be retried after you fix the SAN paths from the PowerStore cluster to the source system.
• If one of the source SPs reboots but the surviving SP can service the source volume, both import and I/Os continue without any impact.

Depending on the nature of the fault, the import orchestrator handles them so that there is minimum impact on the host I/Os. In all these cases, error messages, or alerts, or both describe the issue to the user.

Based on system load, it is possible that the errors between the PowerStore cluster and the source network result in I/O errors to a user application, even when an automatic cancel occurs. For such rare cases, user intervention may be required to restart the I/Os to the source volumes. If the problem persists, contact your service provider for resolution.