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ZPOOL RAID calculator

Determine the usable capacity and other metrics of a ZFS storage pool and compare layouts including stripe, mirror, RAIDZ1, RAIDZ2, RAIDZ3, and dRAID.

Total Disks in Pool:

Add Disk (TB):

100

102

Minimum Spares:

New vdev Type:

OpenZFS 2.0.7 Slop:

New Vdev Width:

ZFS recordsize value:

ZFS ashift value:

Disk Swap Size:

Table Data:

Usable Capacity (TiB)

Decimal Places:

Usable Capacity (TB)

Show Deflate Ratio:

Capacity Efficiency

Show Pool AFR:

ZFS Overhead

Disk AFR (%):

Cap. w/ Reservation

Fast dRAID Calculation:

Reservation (%):

Show Only:

Shelf Count	12-Bay Head	24-Bay Head	48-Bay Head
24-Bay Shelf	1 (12 free)	0 (0 free)	0 (24 free)
60-Bay Shelf	1 (48 free)	0 (0 free)	0 (24 free)
102-Bay Shelf	1 (90 free)	0 (0 free)	0 (24 free)

See Zpool/OpenZFS Cheatsheet

Click on the section titles to expand/collapse and view calculated data. Hovering over a table cell loads the relevant data into the Calculation Values section below. You can click table cells to freeze or unfreeze those values.

Common Layouts

	2-Way Mirror	3-Wide Z1	4-Wide Z1	5-Wide Z1	5-Wide Z2	6-Wide Z2	10-Wide Z2	11-Wide Z2
	12 vdev + 0 spare	8 vdev + 0 spare	6 vdev + 0 spare	4 vdev + 4 spare	4 vdev + 4 spare	4 vdev + 0 spare	2 vdev + 4 spare	2 vdev + 2 spare
4TB	43.375 TiB	57.985 TiB	63.29 TiB	57.99 TiB	42.928 TiB	57.985 TiB	55.29 TiB	60.836 TiB
8TB	87.063 TiB	116.095 TiB	126.706 TiB	116.104 TiB	85.981 TiB	116.136 TiB	110.705 TiB	121.798 TiB
12TB	130.75 TiB	174.288 TiB	190.121 TiB	174.219 TiB	129.035 TiB	174.288 TiB	166.12 TiB	182.759 TiB
18TB	196.188 TiB	261.536 TiB	285.278 TiB	261.391 TiB	193.615 TiB	261.536 TiB	249.266 TiB	274.213 TiB
22TB	239.875 TiB	319.646 TiB	348.761 TiB	319.506 TiB	236.668 TiB	319.687 TiB	304.682 TiB	335.174 TiB
24TB	261.625 TiB	348.701 TiB	380.435 TiB	348.563 TiB	258.194 TiB	348.742 TiB	332.389 TiB	365.643 TiB
26TB	283.563 TiB	377.839 TiB	412.177 TiB	377.621 TiB	279.721 TiB	377.839 TiB	360.097 TiB	396.135 TiB
1.92TB	20.688 TiB	27.764 TiB	30.323 TiB	27.734 TiB	20.514 TiB	27.764 TiB	26.464 TiB	29.13 TiB
3.84TB	41.688 TiB	55.654 TiB	60.77 TiB	55.643 TiB	41.19 TiB	55.695 TiB	53.076 TiB	58.385 TiB
7.68TB	83.688 TiB	111.516 TiB	121.665 TiB	111.461 TiB	82.542 TiB	111.516 TiB	106.278 TiB	116.918 TiB
15.36TB	167.5 TiB	223.157 TiB	243.455 TiB	223.048 TiB	165.208 TiB	223.157 TiB	212.68 TiB	233.961 TiB
30.72TB	335.125 TiB	446.438 TiB	487.035 TiB	446.22 TiB	330.542 TiB	446.438 TiB	425.509 TiB	468.07 TiB
61.44TB	670.375 TiB	893.002 TiB	974.263 TiB	892.615 TiB	661.245 TiB	893.044 TiB	851.143 TiB	936.289 TiB
122.88TB	1.309 PiB	1.744 PiB	1.903 PiB	1.744 PiB	1.292 PiB	1.744 PiB	1.663 PiB	1.829 PiB

Raw, Stripes, & Mirrors

	Raw	Stripe	2-Way Mirror	3-Way Mirror
	24 disks	24 vdev + 0 spare	12 vdev + 0 spare	8 vdev + 0 spare
4TB	96 TB	86.875 TiB	43.375 TiB	28.875 TiB
8TB	192 TB	174.25 TiB	87.063 TiB	58 TiB
12TB	288 TB	261.625 TiB	130.75 TiB	87.125 TiB
18TB	432 TB	392.5 TiB	196.188 TiB	130.75 TiB
22TB	528 TB	479.875 TiB	239.875 TiB	159.875 TiB
24TB	576 TB	523.375 TiB	261.625 TiB	174.375 TiB
26TB	624 TB	567.25 TiB	283.563 TiB	189 TiB
1.92TB	46.08 TB	41.5 TiB	20.688 TiB	13.75 TiB
3.84TB	92.16 TB	83.5 TiB	41.688 TiB	27.75 TiB
7.68TB	184.32 TB	167.5 TiB	83.688 TiB	55.75 TiB
15.36TB	368.64 TB	335.125 TiB	167.5 TiB	111.625 TiB
30.72TB	737.28 TB	670.375 TiB	335.125 TiB	223.375 TiB
61.44TB	1.475 PB	1.309 PiB	670.375 TiB	446.875 TiB
122.88TB	2.949 PB	2.619 PiB	1.309 PiB	893.875 TiB

RAIDZ1

	3-Wide Z1	4-Wide Z1	5-Wide Z1	6-Wide Z1	7-Wide Z1	8-Wide Z1	9-Wide Z1	10-Wide Z1
	8 vdev + 0 spare	6 vdev + 0 spare	4 vdev + 4 spare	4 vdev + 0 spare	3 vdev + 3 spare	3 vdev + 0 spare	2 vdev + 6 spare	2 vdev + 4 spare
4TB	57.985 TiB	63.29 TiB	57.99 TiB	69.573 TiB	64.154 TiB	73.348 TiB	58.055 TiB	64.526 TiB
8TB	116.095 TiB	126.706 TiB	116.104 TiB	139.32 TiB	128.473 TiB	146.861 TiB	116.235 TiB	129.177 TiB
12TB	174.288 TiB	190.121 TiB	174.219 TiB	209.068 TiB	192.791 TiB	220.334 TiB	174.443 TiB	193.828 TiB
18TB	261.536 TiB	285.278 TiB	261.391 TiB	313.715 TiB	289.269 TiB	330.583 TiB	261.728 TiB	290.832 TiB
22TB	319.646 TiB	348.761 TiB	319.506 TiB	383.462 TiB	353.548 TiB	404.095 TiB	319.936 TiB	355.483 TiB
24TB	348.701 TiB	380.435 TiB	348.563 TiB	418.311 TiB	385.707 TiB	440.832 TiB	349.012 TiB	387.808 TiB
26TB	377.839 TiB	412.177 TiB	377.621 TiB	453.21 TiB	417.867 TiB	477.608 TiB	378.116 TiB	420.133 TiB
1.92TB	27.764 TiB	30.323 TiB	27.734 TiB	33.326 TiB	30.732 TiB	35.152 TiB	27.785 TiB	30.895 TiB
3.84TB	55.654 TiB	60.77 TiB	55.643 TiB	66.827 TiB	61.589 TiB	70.428 TiB	55.722 TiB	61.943 TiB
7.68TB	111.516 TiB	121.665 TiB	111.461 TiB	133.779 TiB	123.343 TiB	140.981 TiB	111.598 TiB	124.011 TiB
15.36TB	223.157 TiB	243.455 TiB	223.048 TiB	267.682 TiB	246.811 TiB	282.087 TiB	223.32 TiB	248.148 TiB
30.72TB	446.438 TiB	487.035 TiB	446.22 TiB	535.489 TiB	493.747 TiB	564.339 TiB	446.794 TiB	496.448 TiB
61.44TB	893.002 TiB	974.263 TiB	892.615 TiB	1.046 PiB	987.658 TiB	1.102 PiB	893.712 TiB	993.021 TiB
122.88TB	1.744 PiB	1.903 PiB	1.744 PiB	2.092 PiB	1.929 PiB	2.205 PiB	1.746 PiB	1.94 PiB

RAIDZ2

	5-Wide Z2	6-Wide Z2	7-Wide Z2	8-Wide Z2	9-Wide Z2	10-Wide Z2	11-Wide Z2	12-Wide Z2
	4 vdev + 4 spare	4 vdev + 0 spare	3 vdev + 3 spare	3 vdev + 0 spare	2 vdev + 6 spare	2 vdev + 4 spare	2 vdev + 2 spare	2 vdev + 0 spare
4TB	42.928 TiB	57.985 TiB	50.732 TiB	61.927 TiB	49.744 TiB	55.29 TiB	60.836 TiB	66.359 TiB
8TB	85.981 TiB	116.136 TiB	101.619 TiB	124.011 TiB	99.613 TiB	110.705 TiB	121.798 TiB	132.866 TiB
12TB	129.035 TiB	174.288 TiB	152.507 TiB	186.063 TiB	149.505 TiB	166.12 TiB	182.759 TiB	199.374 TiB
18TB	193.615 TiB	261.536 TiB	228.839 TiB	279.173 TiB	224.32 TiB	249.266 TiB	274.213 TiB	299.135 TiB
22TB	236.668 TiB	319.687 TiB	279.695 TiB	341.258 TiB	274.213 TiB	304.682 TiB	335.174 TiB	365.643 TiB
24TB	258.194 TiB	348.742 TiB	305.139 TiB	372.284 TiB	299.135 TiB	332.389 TiB	365.643 TiB	398.897 TiB
26TB	279.721 TiB	377.839 TiB	330.583 TiB	403.343 TiB	324.082 TiB	360.097 TiB	396.135 TiB	432.15 TiB
1.92TB	20.514 TiB	27.764 TiB	24.289 TiB	29.668 TiB	23.798 TiB	26.464 TiB	29.13 TiB	31.796 TiB
3.84TB	41.19 TiB	55.695 TiB	48.702 TiB	59.46 TiB	47.744 TiB	53.076 TiB	58.385 TiB	63.717 TiB
7.68TB	82.542 TiB	111.516 TiB	97.561 TiB	119.046 TiB	95.637 TiB	106.278 TiB	116.918 TiB	127.558 TiB
15.36TB	165.208 TiB	223.157 TiB	195.247 TiB	238.217 TiB	191.4 TiB	212.68 TiB	233.961 TiB	255.241 TiB
30.72TB	330.542 TiB	446.438 TiB	390.618 TiB	476.592 TiB	382.948 TiB	425.509 TiB	468.07 TiB	510.631 TiB
61.44TB	661.245 TiB	893.044 TiB	781.392 TiB	953.309 TiB	766.021 TiB	851.143 TiB	936.289 TiB	1021.411 TiB
122.88TB	1.292 PiB	1.744 PiB	1.526 PiB	1.862 PiB	1.496 PiB	1.663 PiB	1.829 PiB	1.995 PiB

RAIDZ3

	7-Wide Z3	8-Wide Z3	9-Wide Z3	10-Wide Z3	11-Wide Z3	12-Wide Z3	13-Wide Z3	14-Wide Z3
	3 vdev + 3 spare	3 vdev + 0 spare	2 vdev + 6 spare	2 vdev + 4 spare	2 vdev + 2 spare	2 vdev + 0 spare	1 vdev + 11 spare	1 vdev + 10 spare
4TB	43.424 TiB	49.653 TiB	40.154 TiB	48.328 TiB	58.023 TiB	63.29 TiB	34.228 TiB	36.873 TiB
8TB	86.999 TiB	99.457 TiB	80.432 TiB	96.78 TiB	116.17 TiB	126.728 TiB	68.592 TiB	73.882 TiB
12TB	130.575 TiB	149.234 TiB	120.73 TiB	145.233 TiB	174.318 TiB	190.166 TiB	102.956 TiB	110.88 TiB
18TB	195.938 TiB	223.928 TiB	181.158 TiB	217.933 TiB	261.551 TiB	285.323 TiB	154.497 TiB	166.394 TiB
22TB	239.486 TiB	273.732 TiB	221.456 TiB	266.385 TiB	319.699 TiB	348.761 TiB	188.861 TiB	203.392 TiB
24TB	261.274 TiB	298.621 TiB	241.585 TiB	290.612 TiB	348.761 TiB	380.48 TiB	206.037 TiB	221.897 TiB
26TB	283.062 TiB	323.536 TiB	261.734 TiB	314.838 TiB	377.846 TiB	412.199 TiB	223.225 TiB	240.401 TiB
1.92TB	20.781 TiB	23.775 TiB	19.197 TiB	23.123 TiB	27.78 TiB	30.323 TiB	16.359 TiB	17.63 TiB
3.84TB	41.686 TiB	47.674 TiB	38.539 TiB	46.392 TiB	55.684 TiB	60.77 TiB	32.854 TiB	35.397 TiB
7.68TB	83.524 TiB	95.474 TiB	77.221 TiB	92.909 TiB	111.516 TiB	121.665 TiB	65.845 TiB	70.919 TiB
15.36TB	167.173 TiB	191.072 TiB	154.568 TiB	185.943 TiB	223.157 TiB	243.455 TiB	131.814 TiB	141.963 TiB
30.72TB	334.47 TiB	382.296 TiB	309.28 TiB	372.032 TiB	446.461 TiB	487.058 TiB	263.765 TiB	284.063 TiB
61.44TB	669.092 TiB	764.718 TiB	618.685 TiB	744.189 TiB	893.07 TiB	974.263 TiB	527.666 TiB	568.263 TiB
122.88TB	1.307 PiB	1.494 PiB	1.209 PiB	1.454 PiB	1.744 PiB	1.903 PiB	1.031 PiB	1.11 PiB

dRAID

	draid1:4d:24c:0s	draid1:8d:24c:0s	draid2:8d:24c:0s	draid2:16d:24c:0s	draid3:8d:24c:0s	draid3:16d:24c:0s
	1 vdev + 0 spare	1 vdev + 0 spare	1 vdev + 0 spare	1 vdev + 0 spare	1 vdev + 0 spare	1 vdev + 0 spare
4TB	69.61 TiB	77.453 TiB	69.61 TiB	77.453 TiB	63.302 TiB	73.361 TiB
8TB	139.358 TiB	155.045 TiB	139.358 TiB	155.045 TiB	126.74 TiB	146.86 TiB
12TB	209.105 TiB	232.637 TiB	209.105 TiB	232.637 TiB	190.177 TiB	220.359 TiB
18TB	313.727 TiB	349.025 TiB	313.727 TiB	349.025 TiB	285.334 TiB	330.608 TiB
22TB	383.474 TiB	426.617 TiB	383.474 TiB	426.616 TiB	348.772 TiB	404.107 TiB
24TB	418.348 TiB	465.413 TiB	418.348 TiB	465.412 TiB	380.491 TiB	440.857 TiB
26TB	453.222 TiB	504.209 TiB	453.222 TiB	504.208 TiB	412.21 TiB	477.606 TiB
1.92TB	33.351 TiB	37.116 TiB	33.351 TiB	37.116 TiB	30.322 TiB	35.151 TiB
3.84TB	66.827 TiB	74.357 TiB	66.827 TiB	74.357 TiB	60.77 TiB	70.428 TiB
7.68TB	133.778 TiB	148.838 TiB	133.778 TiB	148.838 TiB	121.665 TiB	140.981 TiB
15.36TB	267.694 TiB	297.816 TiB	267.694 TiB	297.815 TiB	243.466 TiB	282.099 TiB
30.72TB	535.526 TiB	595.77 TiB	535.526 TiB	595.769 TiB	487.069 TiB	564.337 TiB
61.44TB	1.046 PiB	1.164 PiB	1.046 PiB	1.164 PiB	974.262 TiB	1.102 PiB
122.88TB	2.092 PiB	2.328 PiB	2.092 PiB	2.328 PiB	1.903 PiB	2.205 PiB

Calculation Values

(Click table cells above to freeze/unfreeze)

7-wide RAIDZ2 (18 TB disks)
3 vdevs (24 disks, 3 spares)
disk_size	18
vdev_width	7
parity_level	2
raid_type	z
vdev_count	3
disks_in_pool	21
spares_count	3
pool_raw_capacity	378000000000000
zfs_partition_size	18000000000000
vdev_label_size	262144
boot_block_size	4194304
zfs_usable_partition_size	17999994757120
zfs_osize	17999994552320
vdev_asize	125999961866240
metaslab_shift	34
ms_count_max	131072
highbit	30
metaslab_size	17179869184
ms_count	7334
vdev_raw_size	125997160595456
zfs_pool_size	377991481786368
sector_size	4096
recordsize_bytes	131072
min_sector_count	3
num_data_sectors	32
data_stripes	6.4
data_stripes_rounded	7
num_parity_sectors	14
data_plus_parity_sectors	46
total_sector_count	48
reduction_ratio	0.6666666666666666
vdev_deflate_ratio	0.666015625
vdev_usable_capacity	83916077662208
pool_usable_pre_slop	251748232986624
slop_max	137438953472
slop_min	134217728
slop_computed	7867132280832
slop_actual	137438953472
pool_usable_bytes	251610794033152
pool_usable_gib	234330.8125
pool_usable_tib	228.83868408203125
pool_usable_pib	0.22347527742385864
pool_usable_eib	0.00021823757560923696
pool_usable_gb	251610.794033152
pool_usable_tb	251.610794033152
pool_usable_pb	0.251610794033152
pool_usable_eb	0.000251610794033152
storage_efficiency	66.56370212517248
simple_capacity	245.56356947869062
zfs_overhead	6.81081702475852