This error may be seen in the SANtricity software. Other possible errors that may show up in the Recovery Guru file are as follows:
Either the cache battery or the whole controller needs to be replaced.
Generate a support log bundle using the following KB: How to generate a support bundle for Dell MD3860 or NetApp attached storage
This will most likely require a controller replacement. Each storage array has two controllers for redundancy and losing or replacing one controller should not cause any data loss or system downtime.