As of 2014, Solid state storage is dominated by NAND-flash and most articles on solid state storage focus on it exclusively. As of 2014, the most popular form of flash storage used with ZFS involve drives with SATA interfaces. Enterprise models with SAS interfaces are beginning to become available.
== Power Failure Protection ==
Flash drives used for top-level vdevs or SLOG devices should have power failure protection. A non-exhaustive list of drives with power failure protection is as follows:
* Crucial MX200
* Samsung PM853T
ZFS only expects storage to protect flushed data. Consequently, solid state drives whose power loss protection only protects flushed data is sufficient for ZFS to ensure that data remains safe. This is why the Crucial drives are on this list, despite Anandtech's description of them not having true power loss protection because their design allows in-flight data (i.e. unflushed data) to be lost.[http://www.anandtech.com/show/8528/micron-m600-128gb-256gb-1tb-ssd-review-nda-placeholder]
=== Background ===
On-flash data structures are highly complex and consequently, vulnerable to corruption. Such corruption can result in the loss of *all* drive data and an event such as a PSU failure can result in multiple drives simultaneously failing. Since the drive firmware is not available for review, the only reasonable conclusion is that all drives that lack hardware features to avoid power failure events cannot be trusted. Therefore, such drives are only suitable for use as L2ARC.
== Flash pages ==