One feature they have which is rather cool, is snapshots: they
can take a static copy of the file system at any time and keep it
on line as a backup. Further writes are done via COW techniques;
new data is written to new blocks and the old data is preserved.
The only problem is that this complicates things like memory-mapped
files (which NetApp's NFS server doesn't have to worry about).
I'm wondering whether it's a valuable feature worth trying to
implement or not.
I suppose big-linux would be a better place to ask, but does anyone here
have any opinions? If it were free, obviously I'd put it in, but
there's significant hassle involved in some of the bookkeeping.
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