Per Baatrup wrote:
I would like to to concatenate N files into one big file taking advantage of
ZFS copy-on-write semantics so that the file concatenation is done without
actually copying any (large amount of) file content.
cat f1 f2 f3 f4 f5 > f15
Is this already possible when source and target are on the same ZFS filesystem?
Am looking into the ZFS source code to understand if there are sufficient (private)
interfaces to make a simple "zcat -o f15 f1 f2 f3 f4 f5" userland application
in C code. Does anybody have advice on this?
The answer to this is likely deduplication which ZFS now has.
The reason dedup should help here is that after the 'cat' f15 will be
made up of blocks that match the blocks of f1 f2 f3 f4 f5.
Copy-on-write isn't what helps you here it is dedup.
--
Darren J Moffat
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