Migration Planner

You have an array and want a different one — bigger drives, more bays, another RAID level. This tool checks whether your data fits, which migration path is possible (in-place drive swap, adding drives, or copy to a new pool), and how long the risky windows are.

Current array
Target array
TB
MB/s
Results
Recommended plan
How this is calculated

Usable capacity uses the same formulas as the main calculator (uniform drive size assumed here). Swap-path time = N × (drive size / rebuild speed); copy time = data / copy speed. Reshape time is approximated like a full rebuild of one drive per added drive.

Which paths are offered depends on the platform rules: same level + same count + bigger drives → swap; same level + more drives → add/reshape (mdadm, SHR, Unraid, OpenZFS 2.3+); everything else → copy migration.

Takeaway: Full step-by-step background in our RAID expansion guide →