I believe that ZFS clocks in at fewer lines of code than competing filesystem + volume manager combos. That certainly was touted as a benefit of ZFS's "rampant layering violation" when first introduced.
end point: ZFS packs a huge quantity of functionality into 80K lines of code (probably closer to 90 or 100 now), which is quite a bit smaller than the combined size of (less featureful) file system + volume manager implemenations that it replaces.
See [1] for a comparison of ZFS vs. UFS+SVM. See [2] for Jeff Bonwick's discussion of the complexity win in ZFS.
end point: ZFS packs a huge quantity of functionality into 80K lines of code (probably closer to 90 or 100 now), which is quite a bit smaller than the combined size of (less featureful) file system + volume manager implemenations that it replaces.
See [1] for a comparison of ZFS vs. UFS+SVM. See [2] for Jeff Bonwick's discussion of the complexity win in ZFS.
[1] http://www.mail-archive.com/zfs-discuss@opensolaris.org/msg0...
[2] https://blogs.oracle.com/bonwick/entry/rampant_layering_viol...