As Wolfgang Lonien recently pointed out , Solaris isn't the only systemwith ZFS, as you can also get it in at least FreeBSD. Despite theseports, I believe that Solaris generally remains your only solid choiceif you need ZFS.

The problem is that ZFS is currently incomplete, with both missingfeatures and significant problems . Thismeans that the work of integrating ZFS into other systems is notcomplete, and there are two potential issues with the remaining work.

The first is the most straightforward: you are taking

Here's something that I've seen illustrated more than once : layering buffering on top ofbuffering is almost always a bad idea .

One of the reasons is that it can be tricky to write a correct version.For example, consider all the things that you have to get right if youwrite a file IO buffering layer on Unix, including:

• you must remember that you've seen an EOF, and return this indicationto the next level up without doing another underlying read() .
• you must return