SANtricity or Dell MDSM is complaining that there are unreadable sectors detected on the storage array. You may see this the following error as well:
Failure Entry 1: USM_UNREADABLE_SECTORS_EXIST-Recovery Failure Type Code: 75
Generate a storage log bundle and open a technical support case so that the storage array can be diagnosed by support. Most likely a hard drive will need to be replaced.