[URGENT] Large Server (90TB) — Library Scans Stalling on Synology NAS

[BaNanaBlocks 9]

Running into a persistent issue I haven’t seen in years and could really use an experienced set of eyes.

• Emby Server: Windows PC
• Storage: Multiple Synology NAS devices (currently 2, adding a 3rd)
• Library Size: ~90TB

Issue:
Two of my largest libraries will not complete a scan.

• Scans start but never finish
• Content remains unavailable for playback
• Metadata is not updating

This has been happening consistently for several days now.

Impact:
This is effectively blocking access to a large portion of my media and breaking normal server operation.

What I’ve tried:

• Re-running scans multiple times
• Waiting extended periods (no completion)

Request:
Looking for guidance on:

• Identifying what’s causing the scan to stall
• Logs or diagnostics I should pull immediately
• Known issues with large libraries + Synology setups

Happy to provide logs, screenshots, or run targeted tests right away.

Edited 4 hours ago by BaNanaBlocks
Added additional information.

[js28194 42]

Never had a large library scan prevent any playback.  They can happen concurrently with no issues.  The better minds would need the EmberServer.txt log file to take a peek.  Sounds like drive/access issue.

[BaNanaBlocks 9]

1 hour ago, js28194 said:

Never had a large library scan prevent any playback.  They can happen concurrently with no issues.  The better minds would need the EmberServer.txt log file to take a peek.  Sounds like drive/access issue.

Thank you. I've been planning to migrate the TV Shows library to a new NAS. Once that's complete, I'll see if the problem persists. I'll keep this post updated.