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I strongly recommend adding a fourth drive and using two mirrored pairs (similar to RAID-10). Less capacity overall, but much better performance. and easier to upgrade (when you upgrade a raid-z, you have to upgrade all drives in the vdev before you get any extra storage available. To upgrade a pool made of mirrored pairs, you can either upgrade just one mirrored pair at a time, OR add an extra mirrored pair of drives. technically you could also add a mirrored pair vdev to a pool that has a raidz vdev but performance will still suck)cas– cas2016-05-01 10:42:23 +00:00Commented May 1, 2016 at 10:42
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FYI: btrfs.wiki.kernel.org and zfsonlinux.orgcas– cas2016-05-01 10:46:23 +00:00Commented May 1, 2016 at 10:46
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sorry, i got that second sentence wrong. a 3-drive RAID-Z (or RAID-5) would have the same capacity as a 4-drive pool of two mirrored pairs (or RAID-10). the mirrored pairs would be much faster for both reads and writes. with mirrored pairs, you also have the option of starting with two drives now, and adding two more later when you need the extra space. and then two more some time later again.cas– cas2016-05-01 10:51:01 +00:00Commented May 1, 2016 at 10:51
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Interesting discussion here: reddit.com/r/linux/comments/32cu9w/zfs_vs_btrfsAndrew Henle– Andrew Henle2016-05-01 17:58:09 +00:00Commented May 1, 2016 at 17:58
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3BTRFS had some issues with the built in RAID5/ RAID6-code in 2016: phoronix.com/… -- might be fixed now. Note that BTRFS is younger than ZFS. Also, in a 2016 filesystem fuzzing, BTRFS died quite early: blog.fefe.de/?ts=a9f560e2Golar Ramblar– Golar Ramblar2017-04-13 15:25:39 +00:00Commented Apr 13, 2017 at 15:25
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