Event Details

Product: Microsoft Windows Operating System
Event ID: 304
Source: StorageSpaces-Driver
Version: Windows Server 2016, Windows Server 2012 R2, Windows Server 2012; Windows 10, Windows 8.1, Windows 8
Level: Warning
Message: One or more drives hosting data for storage space %1 have failed or are missing. As a result, at least one copy of data is not available. However, at least one copy of data is still available. Return Code: %2

Summary

This topic describes how to troubleshoot degraded storage spaces in a Storage Spaces storage pool.

Causes

One or more drives hosting data for a storage space have failed or are missing. As a result, at least one copy of data is not available. However, at least one copy of data is still available.

Resolutions

To resolve the problem:

  • If there are missing drives, reconnect the missing drives.
  • Verify physical drives are functional. Replace failed physical drives if necessary.