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ZFS Capacity Calculator

1 minute read.

Last Modified 2023-12-13 16:02 EST

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):

Minimum Spares:
OpenZFS 2.0.7 Slop:		New vdev Type:
ZFS recordsize value:		New vdev Width:
ZFS ashift value:
Disk Swap Size:
Decimal Places:		Table Data:	Usable Capacity
Show Deflate Ratio:			Capacity Efficiency
Show Pool AFR:			ZFS Overhead
Disk AFR (%):			Cap. w/ Reservation
Assume Resilver:		Reservation (%):
Resilver Time (hrs):

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

Raw, Stripes, & Mirrors

RAIDZ1

RAIDZ2

RAIDZ3

dRAID

Calculation Values

(Click table cells above to freeze/unfreeze)

ZFS Capacity Calculator originally created by Jason Rose.

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