Dell PowerStore Importing External Storage to PowerStore Guide

Exception case

Most times, in cases of a single failure, such as a PowerStore node failure during import with host I/O, both import and I/Os are not impacted. The other node takes over. In rare cases, if import is not able to continue due to such failures, automatic cancel occurs and I/Os are redirected back to the source volume.

Sometimes, the node recovery time might be long and host I/Os might experience latency issues. In worst cases, the I/O timeout expires, leading to temporary data unavailability. Recovery for such cases occurs once the node that went down recovers fully.

If the node cannot reboot or the recovery of the node is taking too long, an option exists to go back to the source. Select Force Stop as part of an Import Actions Cancel action for the import. Some manual intervention may be required at the host side that is based on the I/O load and platform. After the host recovery step, I/Os can resume at the source again. Once the PowerStore node has recovered and PowerStore cluster is healthy, you can attempt imports again. If you run into a problem in this procedure, it is recommended that you contact your service provider.