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EMC Technical Advisory: EMC282741: CLARiiON and VNX: Managing dual solid state drive (SSD) issues

There has been a technical advisory floating around that deserves a little more attention. First released I believe in December, the advisory focuses on SSD soft media issues. If you have a CX, VNX or NS with SSD drives in any configuration please take heed to this information below. Although remote, it needs to be addressed as soon as possible. So please reach out to the EMC support line to get scheduled. Here is more info on the issue…

EMC has become aware that there is a rare possibility that some solid state disk drives contained in your CLARiiON CX4, VNX and Celerra NS storage systems, including those used in mirrored FAST Cache applications, may experience media errors resulting in the following appearing in the Storage Processor (SP) event logs: “Date Stamp” “Time Stamp” Bus1 Enc1 Dsk0 820 Soft Media Error [Bad block] EMC’s CLARiiON CX4, VNX and Celerra NS products contain redundant solid state drives. This redundant design protects data in the event that a single drive becomes unavailable. In the very rare event that a second disk drive in the same RAID group were to encounter similar media events before the system automatically retires the first drive, a dual faulted RAID Group could occur resulting in data unavailability and potential data loss in RAID groups, Storage Pools, and in FAST Cache configurations. In order to mitigate risk of a dual failure, EMC is proactively installing a software patch on your CLARiiON CX4, VNX and Celerra NS storage systems. Further, please be aware that dual SSD events in a RAID group will necessitate engineering procedures to recover the system.