mount: Structure needs cleaning

[MikeJeezy]

> You want the individual drive write caches disabled.  Leaving their read
caches enabled is fine.
>
>The reason is that a power drop, kernel panic, or hardware lockup
>(thermal etc) clears the drive write caches before the blocks are
>written to the platters.  It is suspected that many/most of these free
>space btree corruptions, such as yours here, are caused by data in
>caches not being flushed to the platters.  SAN/RAID controllers with
>BBWC usually guarantee data in the write cache gets properly flushed to
>the platters when the system comes back up. 

Makes total sense. Thanks so much.
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