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13 drives: Difference between revisions
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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. | 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. | ||
<b>MinFail</b>: This many failures will kill the array in the worst case.<br> | |||
<b>MaxTol</b>: This many failures can be tolerated in the best case. | |||
{| class="wikitable" | {| class="wikitable" | ||
Revision as of 12:13, 7 February 2022
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.
MinFail: This many failures will kill the array in the worst case.
MaxTol: This many failures can be tolerated in the best case.
| Name | Setup | Availability | MaxTol | MinFail | Max Rebuild | Perf |
|---|---|---|---|---|---|---|
| raid3z | 10 data, 3 parity | 76.9% (10) | 3 | 4 | 100% + fail | |
| raid3z + HS | 9 data, 3 parity, 1 spare | 69.2% (9) | 3 | 4 | 92.3% | |
| raid2z | 11 data, 2 parity | 84.6% (11) | 2 | 3 | 84.6% + fail | |
| raid2z + HS | 10 data, 2 parity, 1 spare | 76.9% (10) | 2 | 3 | 76.9% | |
| striped raid2z + HS | 2x(4 data, 2 parity), 1 spare | 61.5% (8) | 2 + 2 | 3 | 30.8% | |
| striped raidz + HS | 2x(5 data, 1 parity), 1 spare | 76.9% (10) | 1 + 1 | 2 | 46.2% | |
| striped raidz + HS | 4x(2 data, 1 parity), 1 spare | 61.5% (8) | 1 + 1 + 1 + 1 | 2 | 25% | |
| mirrored raid2z + HS | 2x(4 data, 2 parity), 1 spare | 30.8% (4) | 6 + 2 | 6 | 46.2% | |
| mirrored raidz + HS | 2x(5 data, 1 parity), 1 spare | 38.5% (5) | 6 + 1 | 4 | 46.2% |
14 disks
14 disks might be more attractive. I only list solutions without a hot spare.
| Name | Setup | Availability | MaxTol | MinFail | Max Rebuild | Perf |
|---|---|---|---|---|---|---|
| raid3z | 11 data, 3 parity | 78.6% (11) | 3 | 4 | 100% + fail | |
| raid2z | 12 data, 2 parity | 85.7% (12) | 2 | 3 | 85.7% + fail | |
| striped raid3z | 2x(4 data, 3 parity) | 57.1% (8) | 3 + 3 | 4 | 50% + fail | |
| striped raid2z | 2x(5 data, 2 parity) | 71.4% (10) | 2 + 2 | 3 | 50% + fail | |
| striped raidz | 2x(6 data, 1 parity) | 85.7% (12) | 1 + 1 | 2 | 50% + fail | |
| mirrored raid3z | 2x(4 data, 3 parity) | 28.6% (4) | 7 + 3 | 8 | 50% + fail | |
| mirrored raid2z | 2x(5 data, 2 parity) | 35.7% (5) | 7 + 2 | 6 | 50% + fail | |
| mirrored raidz | 2x(6 data, 1 parity) | 42.9% (6) | 7 + 1 | 4 | 50% + fail |
