Regarding the error checking, as others suggested you're best buying two devices and mirroring them. ZFS has great error checking, why not use it :D http://blogs.sun.com/perrin/entry/slog_blog_or_blogging_on And regarding the memory loss after the battery runs down, that's no different to any hardware raid controller with battery backed cache, which is exactly how this should be seen. ZFS clears the ZIL on a clean shutdown, the only time you need to worry about battery life is if you have a sudden power failure, and in that situation I'd much rather have my data being written to the iRAM than to disk: With the greater speed, there's a far greater chance of the system having had time to finish it's writes, and a far better chance that I can power it on again and have ZFS recover all my data. I do agree the iRAM looks like a fringe product, but to me it's a fringe product that works very well for ZFS if you can fit it in your chassis. Btw, your wishlist is pretty much a word for word description of the high end model of the 'hyperdrive'. It supports up to eight 2GB ECC DDR chips, it's got a 6 hour backup battery (with optional external power too), and it supports copying the data to a laptop or compact flash disk on power fail. The only downside for me is the price. Around £1,700 to get your hands on a 16GB one: http://www.hyperossystems.co.uk/
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