Date: Tue, 14 Jun 2011 09:19:32 +0200 From: Per von Zweigbergk <pvz@itassistans.se> To: freebsd-fs@freebsd.org Subject: Disk usage and ZFS deduplication Message-ID: <9544F7B9-E286-4266-86E3-B4D1A667CBBD@itassistans.se>
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I've been following the "Impossible compression ratio on ZFS" thread = with some interest, and it made me ask myself this: Let us say we have a hypothetical zfs filesystem with the equally = hypothetical files A and B. The filesystem has deduplication enabled. = Both files have an apparent file size of 100 MB, but 50 MB of that data = is common between the two files and thus can be deduplicated. This would = mean that total disk usage would be 150 MB. If you use "du" to determine disk size for a deduplication, what would = be the result? Which file would the common data be accounted to? Or = would it be accounted to both files somehow, in part or in full?=
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