Storage tools for planning arrays before buying drives
Compare capacity, protection, rebuild exposure, growth, and cost using the drives and layout you actually plan to run.
Choose a storage planner
3-2-1 backup calculator
Size local and off-site targets from your backup plan.
RAID calculator
Compare RAID capacity, mixed-drive waste, group layouts, and failure boundaries.
ZFS capacity calculator
Model vdevs, RAIDZ allocation, slop space, special roles, and planning headroom.
ZFS padding calculator
See how one block is divided into data, parity, and padding.
RAIDZ expansion planner
Compare capacity as a RAIDZ vdev grows by one drive at a time.
SHR calculator
Estimate fresh-pool SHR-1 or SHR-2 capacity from a mixed set of drive sizes.
Unraid calculator
Assign parity and data roles, then check capacity and the size limit for a future drive.
SnapRAID and mergerfs planner
Build reviewable SnapRAID and mergerfs configuration from your disk and mount paths.
Drive reliability explorer
Compare observed Backblaze failure rates and exposure for specific drive models.
Rebuild exposure calculator
Estimate rebuild time, source reads, and modeled read-error exposure while degraded.
Ceph capacity planner
Model usable capacity, reserve, and the loss of the largest named failure domain.
Storage growth planner
Compare reserve, the first capacity shortfall, and total cost as stored data grows.
Storage layout advisor
Compare layouts against your drives, failure target, and workload preference.
Restic retention simulator
Preview which restic snapshots retention rules keep, with bucket and grouping reasons.
NFS firewall planner
Plan source-scoped NFSv3 or NFSv4 host-firewall listeners for firewalld, UFW, or nftables. Verified helper ports are required for NFSv3.