ZFS overhead calc.xlsx
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total disksdata disksraidz levelrecordsize (bytes)sector size (bytes)sectorstheoretical sectors per diskfull stripespartial stripe sectorstotal theoretical sectorstotal actual sectorsallocation paddingallocation overhead % (before ZFS copy-on-write reservation, AKA slop_shift)
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128KiB records
ashift=12
Hover here for a walkthrough of the calculation
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422131072409632161606464663.125
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53213107240963210.6666666710253.3333333354541.25
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6421310724096328804848480
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7521310724096326.46244.846487.142857143
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8621310724096325.3333333335242.6666666744455.46875
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9721310724096324.5714285714441.1428571442422.083333333
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10821310724096324404040425
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11921310724096323.5555555563539.1111111140427.386363636
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121021310724096323.23238.440429.375
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131121310724096322.90909090921037.8181818238393.125
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141221310724096322.6666666672837.3333333338394.464285714
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151321310724096322.4615384622636.9230769238395.625
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161421310724096322.2857142862436.5714285738396.640625
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171521310724096322.1333333332236.2666666738397.536764706
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181621310724096322203636360
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191721310724096321.88235294111535.7647058836360.6578947368
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201821310724096321.77777777811435.5555555636361.25
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211921310724096321.68421052611335.3684210536361.785714286
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222021310724096321.611235.236362.272727273
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232121310724096321.52380952411135.0476190536362.717391304
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242221310724096321.45454545511034.9090909136363.125
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1MiB records
ashift=12
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4221048576409625612812805125125130.1953125
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5321048576409625685.33333333851426.66666674284290.546875
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64210485764096256646403843843840
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7521048576409625651.2511358.43603600.4464285714
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8621048576409625642.66666667424341.33333333423420.1953125
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9721048576409625636.57142857364329.14285713303300.2604166667
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108210485764096256323203203203210.3125
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11921048576409625628.44444444284312.88888893143150.6747159091
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121021048576409625625.6256307.23083090.5859375
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131121048576409625623.27272727233302.54545453043061.141826923
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141221048576409625621.33333333214298.66666673003000.4464285714
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151321048576409625619.69230769199295.38461542962970.546875
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161421048576409625618.28571429184292.57142862942940.48828125
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171521048576409625617.06666667171290.13333332922941.332720588
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1816210485764096256161602882882880
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191721048576409625615.05882353151286.11764712882880.6578947368
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201821048576409625614.22222222144284.44444442862881.25
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211921048576409625613.47368421139282.94736842842850.7254464286
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222021048576409625612.81216281.62822820.1420454545
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232121048576409625612.19047619124280.38095242822820.5774456522
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242221048576409625611.636363641114279.27272732802820.9765625
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128KiB records
ashift=9
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42213107251225612812805125125130.1953125
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53213107251225685.33333333851426.66666674284290.546875
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642131072512256646403843843840
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75213107251225651.2511358.43603600.4464285714
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86213107251225642.66666667424341.33333333423420.1953125
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97213107251225636.57142857364329.14285713303300.2604166667
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1082131072512256323203203203210.3125
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119213107251225628.44444444284312.88888893143150.6747159091
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1210213107251225625.6256307.23083090.5859375
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1311213107251225623.27272727233302.54545453043061.141826923
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1412213107251225621.33333333214298.66666673003000.4464285714
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1513213107251225619.69230769199295.38461542962970.546875
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1614213107251225618.28571429184292.57142862942940.48828125
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1715213107251225617.06666667171290.13333332922941.332720588
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18162131072512256161602882882880
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1917213107251225615.05882353151286.11764712882880.6578947368
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2018213107251225614.22222222144284.44444442862881.25
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2119213107251225613.47368421139282.94736842842850.7254464286
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2220213107251225612.81216281.62822820.1420454545
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2321213107251225612.19047619124280.38095242822820.5774456522
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2422213107251225611.636363641114279.27272732802820.9765625
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