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 !! Availability !! | ! Name !! Setup !! Availability !! MaxTol !! MinFail !! Max Rebuild !! Perf | ||
|- | |- | ||
| raid3z | | raid3z | ||
| 76.9% | | 10 data, 3 parity | ||
| 76.9% (10) | |||
| 3 | | 3 | ||
| 100% | | 4 | ||
| 100% + fail | |||
| | | | ||
|- | |- | ||
| raid3z + HS | | raid3z + HS | ||
| 69.2% | | 9 data, 3 parity, 1 spare | ||
| 69.2% (9) | |||
| 3 | | 3 | ||
| 4 | |||
| 92.3% | | 92.3% | ||
| | | | ||
|- | |||
| raid2z | |||
| 11 data, 2 parity | |||
| 84.6% (11) | |||
| 2 | |||
| 3 | |||
| 84.6% + fail | |||
| | |||
|- | |- | ||
| raid2z + HS | | raid2z + HS | ||
| 76.9% | | 10 data, 2 parity, 1 spare | ||
| 76.9% (10) | |||
| 2 | | 2 | ||
| 3 | |||
| 76.9% | | 76.9% | ||
| | | | ||
|- | |- | ||
| striped raid2z + HS | | 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% | | 46.2% | ||
| | | | ||
|- | |- | ||
| striped raidz + HS | | striped raidz + HS | ||
| 61.5% | | 4x(2 data, 1 parity), 1 spare | ||
| | | 61.5% (8) | ||
| 1 + 1 + 1 + 1 | |||
| 2 | |||
| 25% | | 25% | ||
| | | | ||
|- | |- | ||
| mirrored raid2z + HS | | mirrored raid2z + HS | ||
| 30.8% | | 2x(4 data, 2 parity), 1 spare | ||
| 6+2 | | 30.8% (4) | ||
| 6 + 2 | |||
| 6 | |||
| 46.2% | | 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 [[Schwarzgerat_III|over here]]. | |||