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Re: WAPBL/cache flush and mfi(4)

It seems that after issuing a cache flush we should hold operations that
write new data until the cache flush is complete.

Also, it seems like flush is a big hammer and we really want to ask that
all writes before a barrier be done instead.  But I'm unclear on the

I've seen problems with WD Elements disks where a cache flush takes
400ms (apparently always).

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