I'm planning on upgrading my home NAS. I was wondering which would the best configuration for my DATA zpool. I'm not looking at ultrahigh performance. I'd be satisfied with let's say 300 MB/s read and writes. I'm not looking for >500 MB/s performances, although I wouldn't want less than 200 MB/s :e .
I'm planning on setting up the OS (ROOT pool) on 2x 240 GB mirror SSD. That leaves 8x 3.0 TB or 4.0 TB (still haven't decided yet) HDDs for the DATA pool. Now it seems eight disks isn't the best configuration for any RAID-Z implementations, since:
Therefore I'm wondering about what to do with an eight drives configuration. "Optimal" possibilities are (assuming 4.0 TB disks):
Obviously there are also others possibilities. Although sub-optimal I wonder how these would perform.
Of course I'm open to accept any other suggestions
I'm planning on setting up the OS (ROOT pool) on 2x 240 GB mirror SSD. That leaves 8x 3.0 TB or 4.0 TB (still haven't decided yet) HDDs for the DATA pool. Now it seems eight disks isn't the best configuration for any RAID-Z implementations, since:
- RAID-Z1 recommends 3, 5, 9, ..., (2N+1) drives
- RAID-Z2 recommends 4, 6, 10, ..., (2N+2) drives
- RAID-Z3 recommends 5, 7, 11, ..., (2N+3) drives
Therefore I'm wondering about what to do with an eight drives configuration. "Optimal" possibilities are (assuming 4.0 TB disks):
- 2 x RAID-Z2 (each vdev made of four HDDs) and no spare HDD (usable space: 16.0 TB, worst case redundancy: two HDDs failing)
- 1 x RAID-Z3 (one vdev made of seven HDDs) + one spare HDD (usable space: 16.0 TB, worst case redundancy: three HDDs failing)
- 4 x mirror (each mirror made of two HDDs) and no spare HDD (usable space: 16.0 TB , worst case redundancy: one HDD failing)
Obviously there are also others possibilities. Although sub-optimal I wonder how these would perform.
- 1 x RAID-Z3 (with eight HDDs, usable space: 20.0 TB)
- 1 x RAID-Z2 (with eight HDDs, usable space: 24.0 TB)
Of course I'm open to accept any other suggestions