Date: Sun, 23 Nov 2014 23:26:23 +0100 From: Christian Baer <christian.baer@uni-dortmund.de> To: freebsd-questions@freebsd.org Subject: How much space does raidz2 'eat'? Message-ID: <20141123232623.39d46c80@falbala.rz1.convenimus.net>
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Good evening dear users! :-) I just installed my first file server with zfs/zpool. Until now I only ever used UFS. My pool consists of 7 HDDs of the type WDC WD40EFRX-68WT0N0. smart tells me the user capacity is: 4,000,787,030,016 bytes. After creating a raidz2 pool, I get this: Filesystem Size Used Avail Capacity iused ifree %iused Mounted on /dev/ufs/root 992M 491M 421M 54% 2.2k 129k 2% / devfs 1.0K 1.0K 0B 100% 0 0 100% /dev /dev/ufs/var 34G 1.1G 30G 4% 2.1k 4.7M 0% /var /dev/ufs/usr 58G 6.0G 47G 11% 269k 7.6M 3% /usr arc1 16T 192K 16T 0% 7 35G 0% /arc1 Notes: #1 I did not use phyiscal drives but geli-providers. I want an encrypted pool. #2 This pool is mainly for cold storage. I do not need extremely high performance, but I'd rather optimize it for space. Now I know that while WD works with kB, FreeBSD works with KiB (factor 1024). However, if I break this drive down to that and multiply that by 5, I get 18.19TiB, while df gives me 16TiB. Sure, there is some overhead and all, but certainly (hopefully) not 2 whole TiB! That would be more than 10%. Is this normal or am I missing something? Regards, Chris
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