Gratis · Rete e infrastruttura IT
Calcolatore di IOPS dello storage.
Calcola quanti dischi servono in base a IOPS, rapporto lettura/scrittura e penalità RAID, e confronta HDD, SSD SATA e NVMe.
Use sustained mixed-workload figures, not the peak 4K read number from a datasheet.
- Back-end IOPS (after write penalty)
- 26,000
- Drives for IOPS
- 186
- Drives for capacity
- 17
- Throughput at this I/O size
- 163.8 MB/s
- Usable capacity of the array
- 223.2 TB
- Functional IOPS of the array
- 20,031
Same workload on other drives
| Drive type | Drives for IOPS |
|---|---|
| 7,200 rpm HDD | 325 |
| 10,000 rpm SAS HDD | 186 |
| 15,000 rpm SAS HDD | 137 |
| SATA SSD (sustained mixed) | 2 |
| NVMe SSD, data-centre (sustained mixed) | 2 |
- Functional IOPS = raw IOPS × read % + raw IOPS × write % ÷ write penalty. Controller caches and SSD tiers can hide part of the penalty.
- Replace the per-drive IOPS with figures measured with fio or the vendor’s steady-state numbers for your block size.
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Note tecniche in inglese
Per-drive IOPS are conservative sustained values; use measured or vendor steady-state figures. Controller and SSD caches are not modelled. Everything is calculated in your browser; nothing is sent or probed on the network.
Back-end IOPS = workload × (read % + write % × write penalty). Drives = back-end IOPS ÷ IOPS per drive, then at least enough for the capacity.
20,000 IOPS at 70 % reads on RAID 10 with 10k SAS drives needs 186 drives; NVMe needs 2.