Yes there are.
Network Appliance filers (intel or alpha machines doing disk serving) use
NVRAM boards for that exact reason (to replay disk requests after a dirty
shutdown)
I actually have a few old EISA NVRAM boards, and of course they've been
using PCI for a few years, so you can also buy those nowadays.
Unfortunately the board I have doesn't have any markings, so I'm not sure
what company sells them.
Marc
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