Erasure Coding Calculator

Use this calculator to plan a Ceph erasure-coded pool. Enter your hardware layout and the erasure code parameters (k data chunks and m parity chunks), and the calculator will show usable capacity, raw capacity, storage efficiency, read/write IOPS, and the recommended CRUSH failure domain. It also generates the ceph osd erasure-code-profile set command you can run to create the profile.

Erasure Code Profile Name

Number of Datacenters

Number of Racks per Datacenter

Number of Servers per Rack

Number of OSD Drives per Server

Drive Capacity

TiB

Drive IOPS

Data Chunks (K)121110987654321

Erasure Code Parity (M)8765432

Erasure Code Stripe Unit

32768163848192409620481024

Bytes

Everage Object/File Size

KB

Usable Capacity

128 TiB

Raw Capacity

192 TiB

Storage Efficiency

66.41 %

Read/Write IOPS

read: 2400; write: 1600

Raw IOPS

9600

Read/Write IOPS Efficiency %

read: 25.00 %; write: 16.67 %

Erasure Code Stripe Width

16384

Failure Domain

host

Command To Create EC Profile

Copy

ceph osd erasure-code-profile set erasure k=4 m=2 crush-failure-domain=host

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