CoW = copy on write, a ZFS feature, which makes snapshots easier to maintain.

However it also introduces file fragmentation in database datafiles.

> Sorry, I just cannot tell how is this name related to
> Sun, IMHO.
> 
> In my days and enterprise environments, lots of CoWs
> are stored in 
> relational databases.
> I dunno where the hell you come from.
> 
> best,
> z
>
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