> For the complete documentation index, see [llms.txt](https://docs.vergeos-demo.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.vergeos-demo.com/knowledge-base/storage-vsan.md).

# Storage & vSAN

Articles covering vSAN architecture, storage tiers, scaling, encryption, and NAS.

* [Adding Tier 0 to an Existing System](/knowledge-base/storage-vsan/adding-tier-zero.md) — Step-by-step guide for adding Tier 0 metadata storage to an existing VergeOS system that was not configured with Tier 0 during initial…
* [Identifying a Failed Disk Drive](/knowledge-base/storage-vsan/identifying-a-failed-disk-drive.md) — Learn how to identify and locate a failed disk drive in your VergeOS environment using the LED control diagnostic tool for physical drive…
* [NAS Volume Browser API Reference](/knowledge-base/storage-vsan/nas-volume-browser-api.md) — How to use the VergeOS volume\_browser API to browse NAS volume contents programmatically, including the asynchronous job workflow, polling…
* [Preferred Tier Usage](/knowledge-base/storage-vsan/preferred-tier-usage.md) — Explains how VergeOS determines which vSAN storage tier to use when a VM disk's preferred tier is set to a non-existent tier, including…
* [Scaling Down a vSAN (Removing Drives)](/knowledge-base/storage-vsan/scaling-down-a-vsan.md) — How to request a vSAN scale-down (drive removal) through VergeOS Support, including what to prepare before opening a ticket.
* [Scaling Up a vSAN](/knowledge-base/storage-vsan/scaling-up-a-vsan.md) — Step-by-step procedure for scaling up a VergeOS vSAN by adding new drives or Fibre Channel LUNs to existing nodes, including capacity…
* [Troubleshooting NAS Shares](/knowledge-base/storage-vsan/troubleshooting-nas-shares.md) — Troubleshooting guide for common NAS CIFS share issues including connectivity errors, permission denied errors, slow performance, and MacOS…
* [Understanding and Explaining Unexpected vSAN Growth](/knowledge-base/storage-vsan/understanding-and-explaining-unexpected-vsan-growth.md) — Troubleshooting guide for diagnosing unexpected vSAN storage growth, including how to review tier history and identify common causes like…
* [Understanding vSAN Tier Status/Journal Walks](/knowledge-base/storage-vsan/understanding-journal-walks-and-vsan-tier-status.md) — Understanding vSAN Tier Dashboard status metrics including Journal Walk types, progress tracking, redundancy checks, and repair counts for…
* [vSAN Encryption Information](/knowledge-base/storage-vsan/vsan-encryption-information.md) — Overview of vSAN encryption in VergeOS, including AES256 encryption verification, USB key boot configuration, password-based startup, and…


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