# Hardware Guidelines for the OneDrive for Business Index Server

Verify that the Index Server for OneDrive for Business meets the hardware guidelines. The Index Server stores metadata, and provides browsing and searching of OneDrive for Business files and folders.

Component | Large | Medium | Small
--- | --- | --- | ---
Source application size | 50 TB | 20 TB | 5 TB
Objects per node (estimated)* | 2 billion | 1 billion | 350 million
Number of users** | 10,000 | 4000 | 1000
CPU, vCPU, and RAM | CPU or vCPU: 16 cores RAM: 28 GB - 32 GB | CPU or vCPU: 8 cores RAM: 16 GB | CPU or vCPU: 4 cores RAM: 8 GB
Index disk space (SSD class disk recommended) | 3 TB | 1.5 TB | 500 GB

* Based on an average item size of 100 KB.

** Based on an average user size of 5 GB, and an average of 50,000 items per user.

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