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ZFS sometimes surprises how much space it reports as available directly after creation. As this is non-trivial and usually far from the standard RAID knowledge, the following tables should hopefully help a bit.
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[[_TOC_]]
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### raidz1 ###
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| vdev disks | z1 net | z1 int.loss | z1 full loss | | 12disk | 16disk | 24disk | 36disk |
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|-----------:|-------:|------------:|-------------:|---|-----:|-------:|-------:|-------:|
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| 4 | 2.56 | .147 | .360 | | 7.68 | 10.24 | 15.36 | 23.04 |
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| 5 | 3.52 | .120 | .296 | | 7.04 | 10.56 | 14.08 | 24.64 |
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| 6 | 4.22 | .156 | .297 | | 8.44 | 8.44 | 16.88 | 25.32 |
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| 7 | 5.19 | .135 | .259 | | 5.19 | 10.38 | 15.57 | 25.95 |
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| 8 | 5.93 | .153 | .259 | | 5.93 | 11.86 | 17.79 | 23.72 |
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| 9 | 7.05 | .119 | .217 | | 7.05 | 7.05 | 14.10 | 28.20 |
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| 10 | 7.83 | .130 | .217 | | 7.83 | 7.83 | 15.66 | 23.49 |
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| 11 | 8.61 | .139 | .218 | | 8.61 | 8.61 | 17.22 | 25.83 |
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| 12 | 9.40 | .146 | .217 | | 9.40 | 9.40 | 18.80 | 28.20 |
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| 13 | 10.18 | .152 | .217 | | ./. | 10.18 | 10.18 | 20.36 |
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| 14 | 10.96 | .157 | .218 | | ./. | 10.96 | 10.96 | 21.92 |
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| 15 | 11.75 | .161 | .217 | | ./. | 11.75 | 11.75 | 23.50 |
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| 16 | 12.53 | .165 | .217 | | ./. | 12.53 | 12.53 | 25.06 |
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| 17 | 14.07 | .121 | .173 | | ./. | ./. | 14.07 | 28.14 |
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| 18 | 14.90 | .124 | .173 | | ./. | ./. | 14.90 | 29.80 |
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| 19 | 15.73 | .127 | .173 | | ./. | ./. | 15.73 | 15.73 |
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| 20 | 16.55 | .129 | .173 | | ./. | ./. | 16.55 | 16.55 |
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| 21 | 17.38 | .131 | .173 | | ./. | ./. | 17.38 | 17.38 |
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| 22 | 18.21 | .133 | .173 | | ./. | ./. | 18.21 | 18.21 |
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| 23 | 19.04 | .135 | .173 | | ./. | ./. | 19.04 | 19.04 |
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| 24 | 19.87 | .137 | .173 | | ./. | ./. | 19.87 | 19.87 |
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| 25 | 20.69 | .138 | .173 | | ./. | ./. | ./. | 20.69 |
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| 26 | 21.52 | .140 | .173 | | ./. | ./. | ./. | 21.52 |
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| 27 | 22.35 | .141 | .173 | | ./. | ./. | ./. | 22.35 |
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| 28 | 23.18 | .142 | .173 | | ./. | ./. | ./. | 23.18 |
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| 29 | 24.00 | .143 | .173 | | ./. | ./. | ./. | 24.00 |
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| 30 | 24.83 | .144 | .173 | | ./. | ./. | ./. | 24.83 |
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| 31 | 25.66 | .145 | .173 | | ./. | ./. | ./. | 25.66 |
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| 32 | 26.49 | .146 | .173 | | ./. | ./. | ./. | 26.49 |
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| 33 | 27.32 | .147 | .173 | | ./. | ./. | ./. | 27.32 |
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| 34 | 28.14 | .148 | .173 | | ./. | ./. | ./. | 28.14 |
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| 35 | 28.97 | .148 | .173 | | ./. | ./. | ./. | 28.97 |
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| 36 | 29.80 | .149 | .173 | | ./. | ./. | ./. | 29.80 |
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### raidz2 ###
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| vdev disks | z2 net | z2 int.loss | z2 full loss | | 12disk | 16disk | 24disk | 36disk |
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|-----------:|-------:|------------:|-------------:|---|-----:|-------:|-------:|-------:|
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| 4 | 1.71 | .145 | .573 | | 5.13 | 6.84 | 10.26 | 15.39 |
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| 5 | 2.61 | .130 | .478 | | 5.22 | 7.83 | 10.44 | 18.27 |
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| 6 | 3.52 | .120 | .414 | | 7.04 | 7.04 | 14.08 | 21.12 |
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| 7 | 4.11 | .178 | .413 | | 4.11 | 8.22 | 12.33 | 20.55 |
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| 8 | 5.01 | .165 | .374 | | 5.01 | 10.02 | 15.03 | 20.04 |
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| 9 | 6.04 | .138 | .329 | | 6.04 | 6.04 | 12.08 | 24.16 |
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| 10 | 6.71 | .162 | .329 | | 6.71 | 6.71 | 13.42 | 20.13 |
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| 11 | 7.38 | .180 | .330 | | 7.38 | 7.38 | 14.76 | 22.14 |
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| 12 | 8.05 | .195 | .330 | | 8.05 | 8.05 | 16.10 | 24.15 |
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| 13 | 9.40 | .146 | .277 | | ./. | 9.40 | 9.40 | 18.80 |
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| 14 | 10.12 | .157 | .278 | | ./. | 10.12 | 10.12 | 20.24 |
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| 15 | 10.84 | .167 | .278 | | ./. | 10.84 | 10.84 | 21.68 |
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| 16 | 11.56 | .175 | .278 | | ./. | 11.56 | 11.56 | 23.12 |
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| 17 | 12.29 | .181 | .278 | | ./. | ./. | 12.29 | 24.58 |
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| 18 | 14.09 | .120 | .218 | | ./. | ./. | 14.09 | 28.18 |
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| 19 | 14.88 | .125 | .217 | | ./. | ./. | 14.88 | 14.88 |
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| 20 | 15.66 | .130 | .217 | | ./. | ./. | 15.66 | 15.66 |
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| 21 | 16.44 | .135 | .218 | | ./. | ./. | 16.44 | 16.44 |
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| 22 | 17.23 | .139 | .217 | | ./. | ./. | 17.23 | 17.23 |
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| 23 | 18.01 | .143 | .217 | | ./. | ./. | 18.01 | 18.01 |
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| 24 | 18.79 | .146 | .218 | | ./. | ./. | 18.79 | 18.79 |
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| 25 | 19.57 | .150 | .218 | | ./. | ./. | ./. | 19.57 |
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| 26 | 20.36 | .152 | .217 | | ./. | ./. | ./. | 20.36 |
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| 27 | 21.14 | .155 | .218 | | ./. | ./. | ./. | 21.14 |
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| 28 | 21.92 | .157 | .218 | | ./. | ./. | ./. | 21.92 |
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| 29 | 22.71 | .159 | .217 | | ./. | ./. | ./. | 22.71 |
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| 30 | 23.49 | .162 | .217 | | ./. | ./. | ./. | 23.49 |
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| 31 | 24.27 | .164 | .218 | | ./. | ./. | ./. | 24.27 |
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| 32 | 25.06 | .165 | .217 | | ./. | ./. | ./. | 25.06 |
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| 33 | 25.84 | .167 | .217 | | ./. | ./. | ./. | 25.84 |
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| 34 | 26.62 | .169 | .218 | | ./. | ./. | ./. | 26.62 |
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| 35 | 27.40 | .170 | .218 | | ./. | ./. | ./. | 27.40 |
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| 36 | 28.19 | .171 | .217 | | ./. | ./. | ./. | 28.19 |
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### raidz3 ###
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| vdev disks | z3 net | z3 int.loss | z3 full loss | | 12disk | 16disk | 24disk | 36disk |
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|-----------:|-------:|------------:|-------------:|---|-----:|-------:|-------:|-------:|
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| 4 | 0.88 | .120 | .780 | | 2.64 | 3.52 | 5.28 | 7.92 |
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| 5 | 1.76 | .120 | .648 | | 3.52 | 5.28 | 7.04 | 12.32 |
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| 6 | 2.48 | .174 | .587 | | 4.96 | 4.96 | 9.92 | 14.88 |
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| 7 | 3.52 | .120 | .498 | | 3.52 | 7.04 | 10.56 | 17.60 |
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| 8 | 4.02 | .196 | .498 | | 4.02 | 8.04 | 12.06 | 16.08 |
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| 9 | 4.88 | .187 | .458 | | 4.88 | 4.88 | 9.76 | 19.52 |
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| 10 | 5.87 | .162 | .413 | | 5.87 | 5.87 | 11.74 | 17.61 |
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| 11 | 7.04 | .120 | .360 | | 7.04 | 7.04 | 14.08 | 21.12 |
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| 12 | 7.68 | .147 | .360 | | 7.68 | 7.68 | 15.36 | 23.04 |
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| 13 | 8.32 | .168 | .360 | | ./. | 8.32 | 8.32 | 16.64 |
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| 14 | 8.96 | .186 | .360 | | ./. | 8.96 | 8.96 | 17.92 |
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| 15 | 9.60 | .200 | .360 | | ./. | 9.60 | 9.60 | 19.20 |
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| 16 | 10.24 | .213 | .360 | | ./. | 10.24 | 10.24 | 20.48 |
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| 17 | 10.88 | .223 | .360 | | ./. | ./. | 10.88 | 21.76 |
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| 18 | 11.52 | .232 | .360 | | ./. | ./. | 11.52 | 23.04 |
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| 19 | 13.37 | .165 | .297 | | ./. | ./. | 13.37 | 13.37 |
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| 20 | 14.08 | .172 | .296 | | ./. | ./. | 14.08 | 14.08 |
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| 21 | 14.78 | .179 | .297 | | ./. | ./. | 14.78 | 14.78 |
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| 22 | 15.48 | .186 | .297 | | ./. | ./. | 15.48 | 15.48 |
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| 23 | 16.19 | .191 | .297 | | ./. | ./. | 16.19 | 16.19 |
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| 24 | 16.89 | .196 | .297 | | ./. | ./. | 16.89 | 16.89 |
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| 25 | 17.60 | .200 | .296 | | ./. | ./. | ./. | 17.60 |
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| 26 | 18.30 | .205 | .297 | | ./. | ./. | ./. | 18.30 |
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| 27 | 19.00 | .209 | .297 | | ./. | ./. | ./. | 19.00 |
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| 28 | 19.71 | .212 | .297 | | ./. | ./. | ./. | 19.71 |
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| 29 | 20.41 | .215 | .297 | | ./. | ./. | ./. | 20.41 |
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| 30 | 21.12 | .218 | .296 | | ./. | ./. | ./. | 21.12 |
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| 31 | 21.82 | .221 | .297 | | ./. | ./. | ./. | 21.82 |
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| 32 | 22.52 | .224 | .297 | | ./. | ./. | ./. | 22.52 |
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| 33 | 23.23 | .226 | .297 | | ./. | ./. | ./. | 23.23 |
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| 34 | 23.93 | .229 | .297 | | ./. | ./. | ./. | 23.93 |
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| 35 | 27.40 | .144 | .218 | | ./. | ./. | ./. | 27.40 |
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| 36 | 28.19 | .146 | .217 | | ./. | ./. | ./. | 28.19 | |
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