Even Intel, behemoth of reliable server hardware, wasnt able to fix Sandforce problems. According to Intel representative Graceful Failover of SSD drive means

Even Intel, behemoth of reliable server hardware, wasnt able to fix Sandforce problems. According to Intel representative Graceful Failover of SSD drive means you _kill_ the drive in software during a reboot :DDD and not switch it to read only mode (like you promise in the documentation).