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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" | ||
! Name !! Setup !! Availability !! | ! Name !! Setup !! Availability !! MaxTol !! MinFail !! Max Rebuild !! Perf | ||
|- | |- | ||
| raid3z | | raid3z | ||
| Line 8: | Line 11: | ||
| 76.9% (10) | | 76.9% (10) | ||
| 3 | | 3 | ||
| 4 | |||
| 100% + fail | | 100% + fail | ||
| | | | ||
| Line 15: | Line 19: | ||
| 69.2% (9) | | 69.2% (9) | ||
| 3 | | 3 | ||
| 4 | |||
| 92.3% | | 92.3% | ||
| | | | ||
| Line 22: | Line 27: | ||
| 84.6% (11) | | 84.6% (11) | ||
| 2 | | 2 | ||
| 3 | |||
| 84.6% + fail | | 84.6% + fail | ||
| | | | ||
| Line 29: | Line 35: | ||
| 76.9% (10) | | 76.9% (10) | ||
| 2 | | 2 | ||
| 3 | |||
| 76.9% | | 76.9% | ||
| | | | ||
| Line 35: | Line 42: | ||
| 2x(4 data, 2 parity), 1 spare | | 2x(4 data, 2 parity), 1 spare | ||
| 61.5% (8) | | 61.5% (8) | ||
| 2+2 | | 2 + 2 | ||
| 3 | |||
| 30.8% | | 30.8% | ||
| | | | ||
| Line 42: | Line 50: | ||
| 2x(5 data, 1 parity), 1 spare | | 2x(5 data, 1 parity), 1 spare | ||
| 76.9% (10) | | 76.9% (10) | ||
| 1+1 | | 1 + 1 | ||
| 2 | |||
| 46.2% | | 46.2% | ||
| | | | ||
| Line 49: | Line 58: | ||
| 4x(2 data, 1 parity), 1 spare | | 4x(2 data, 1 parity), 1 spare | ||
| 61.5% (8) | | 61.5% (8) | ||
| 1+1+1+1 | | 1 + 1 + 1 + 1 | ||
| 2 | |||
| 25% | | 25% | ||
| | | | ||
| Line 56: | Line 66: | ||
| 2x(4 data, 2 parity), 1 spare | | 2x(4 data, 2 parity), 1 spare | ||
| 30.8% (4) | | 30.8% (4) | ||
| 6+2 | | 6 + 2 | ||
| 6 | |||
| 46.2% | | 46.2% | ||
| | | | ||
| Line 64: | Line 75: | ||
| 38.5% (5) | | 38.5% (5) | ||
| 6 + 1 | | 6 + 1 | ||
| 4 | |||
| 46.2% | | 46.2% | ||
| | | | ||
|} | |} | ||
14 disks might be more attractive; I work that out [[Schwarzgerat_III|over here]]. | |||
Latest revision as of 21:15, 12 March 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 might be more attractive; I work that out over here.
