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13 drives

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Revision as of 12:04, 7 February 2022 by Dank (talk | contribs) (→‎14 disks)

What's the best setup for 13 drives? I don't need high performance (this will be mostly for archiving media), but very much do not want to lose my data. The drives are 18TB, and ZFS will be used exclusively.

Name Setup Availability Tolerance Max Rebuild Perf
raid3z 10 data, 3 parity 76.9% (10) 3 100% + fail
raid3z + HS 9 data, 3 parity, 1 spare 69.2% (9) 3 92.3%
raid2z 11 data, 2 parity 84.6% (11) 2 84.6% + fail
raid2z + HS 10 data, 2 parity, 1 spare 76.9% (10) 2 76.9%
striped raid2z + HS 2x(4 data, 2 parity), 1 spare 61.5% (8) 2 + 2 30.8%
striped raidz + HS 2x(5 data, 1 parity), 1 spare 76.9% (10) 1 + 1 46.2%
striped raidz + HS 4x(2 data, 1 parity), 1 spare 61.5% (8) 1 + 1 + 1 + 1 25%
mirrored raid2z + HS 2x(4 data, 2 parity), 1 spare 30.8% (4) 6 + 2 46.2%
mirrored raidz + HS 2x(5 data, 1 parity), 1 spare 38.5% (5) 6 + 1 46.2%

14 disks

14 disks might be more attractive. I only list solutions without a hot spare.

Name Setup Availability Tolerance Max Rebuild Perf
raid3z 11 data, 3 parity 78.6% (11) 3 100% + fail
raid2z 12 data, 2 parity 85.7% (12) 2 85.7% + fail
striped raid3z 2x(4 data, 3 parity) 57.1% (8) 3 + 3 50% + fail
striped raid2z 2x(5 data, 2 parity) 71.4% (10) 2 + 2 50% + fail
striped raidz 2x(6 data, 1 parity) 85.7% (12) 1 + 1 50% + fail
mirrored raid3z 2x(4 data, 3 parity) 28.6% (4) 7 + 3 50% + fail
mirrored raid2z 2x(5 data, 2 parity) 35.7% (5) 7 + 2 50% + fail
mirrored raidz 2x(6 data, 1 parity) 42.9% (6) 7 + 1 50%