OpenZFS deduplication is good now and you shouldn't use it

Nice work!<p>I found setup worked well on my ZFS device. The main issue with ZFS that I ran into was slow writes even with caches when dealing with a lot of disks. It just felt like I wasn’t making the most of my hardware even with bulk not modifying writes.<p>I guess it may be the result of needing to do random writes to update directory structures or similar?<p>I had an array of 10 8GB drives and large writes would get &lt;100MB&#x2F;s even on 10GBE and the bottleneck wasn’t cpu or memory either.

Everybody talks about OpenZFS block level dedup. The real gem is to use file level deduplication in copy-on-write transactional filesystems like ZFS.<p><pre><code> cp --reflink=auto </code></pre> The commands above perform a lightweight copy (zfs clone in file level), where the data blocks are copied only when modified.