Date: Thu, 20 Sep 2012 08:46:24 -0700 (PDT) From: Jason Usher <jusher71@yahoo.com> To: freebsd-fs@freebsd.org Subject: ZFS stats output - used, compressed, deduped, etc. Message-ID: <1348155984.52722.YahooMailClassic@web121204.mail.ne1.yahoo.com>
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Hi, I have a ZFS filesystem with compression turned on. Does the "used" property show me the actual data size, or the compressed data size ? If it shows me the compressed size, where can I see the actual data size ? I also wonder about checking status of dedupe - I created my pool without dedupe, and continue to NOT enable dedupe - from zpool history, we see: zpool create -f -O atime=off -O setuid=off -O exec=off -m /mnt/pool pool raidz3 da0 da1 da2 da3 da4 da5 da6 da7 da8 da9 da10 da11 Later, I enabled dedup for just a single filesystem on this pool: zfs set dedup=on pool/dataset and now, I see in 'zpool list' a value for dedupratio: pool dedupratio 1.65x - Why do I see a value here ? Isn't dedupe still OFF for the pool as a whole ? I do NOT want to enable dedupe for the entire pool. Also, why do I not see any dedupe stats for the individual filesystem ? I see compressratio, and I see dedup=on, but I don't see any dedupratio for the filesystem itself... Did turning on dedupe for a single filesystem turn it on for the entire pool ?
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