STORAGE PERFORMANCE & CAPACITY

Storage IOPS, Throughput & Latency Calculator

Convert IOPS and block size into throughput (MB/s, MiB/s, Gbit/s), relate measured queue depth, IOPS and latency with Little’s Law, and check how much of a network or Fibre Channel link a workload uses.

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1. Workload Parameters

Example workload (fills example values):

Presets are illustrative starting values only. Replace them with your measured numbers.

I/O block size (KiB):

1 KiB = 1024 bytes (4 KiB = 4096 bytes).

IOPS (measured or target):

Outstanding I/Os (queue depth), measured:

Measured together with the IOPS above (esxtop, iostat aqu-sz, perfmon Avg. Disk Queue Length).

Link to check:

Approximate usable line rate per link / port. FC figures are nominal per-port throughput.

Target latency for queue-depth sizing (ms):

Used to estimate the outstanding I/Os needed to sustain the IOPS above at this latency.

Estimates are a starting point. Review and test before relying on them for production sizing. Link rates are approximate; check your vendor’s documentation for exact usable throughput.

Storage IOPS, Throughput & Latency Calculator

1. Workload Parameters

Result

2. Little’s Law

3. Link Utilisation

4. Formulas Used