PLN-Power Loss Notification
SSSTC PLN(Power Loss Notification)
SSSTC's Power Loss Notification is an efficient and cost-effective power loss protection solution, particularly well-suited for system environments capable of providing advance warning of power outages.
PLN allows the host to send a power loss warning signal to the SSD via the PCIe interface when a power failure is imminent. Upon receiving this signal, the SSD immediately initiates internal data protection processes, such as flushing the cache, updating the mapping table, and completing pending write commands, thereby maximizing data integrity before the power loss occurs.
How PLN Works
(1)Warning Signal Transmission: When the host detects an impending power loss (e.g., a low UPS battery or power anomaly), it sends a power loss warning signal to the SSD through a specific pin on the PCIe interface (such as the PLN# Pin on M.2 PCIe).
(2)SSD Response: Upon receiving the warning signal, the SSD promptly executes the following actions:
- Flushes cached data to NAND Flash.
- Updates the mapping table and critical system metadata.
- Completes all pending write commands.
(3)Safe Shutdown: After completing these operations, the SSD powers down safely.
By utilizing the power loss warning signal sent by the host, the SSD can complete essential data protection operations before power is fully loss, reducing the risk of data loss. When sufficient warning time is available, PLN can deliver protection comparable to Hardware PLP— without the need for additional capacitors—thereby lowering hardware costs. This makes PLN a cost-effective and highly reliable solution, especially well-suited for industrial automation, data centers, and automotive systems equipped with UPS or power monitoring capabilities.
SSSTC's PJ1 and CA8 series have implemented support for PLN technology, enabling rapid execution of data protection processes upon receiving warning signals from the host, ensuring data integrity.
Read more>>What is PLP(Power Loss Protection)?
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