Hello,
I'm using Unraid 7.1.4 and connected an external HDD (24TB ST24000DM001) via USB. At first, it mounts and works fine using Unassigned Devices. However, after about half a day, the drive suddenly becomes unavailable — the mount/unmount icons are greyed out, and it appears as an Array disk (even though it’s not).

Here is the issue timeline and relevant logs:

• The drive is detected normally:

Jul 5 21:59:43 YURIANAS kernel: sd 7:0:0:0: [sdf] 46875541504 512-byte logical blocks: (24.0 TB/21.8 TiB)
Jul 5 21:59:43 YURIANAS kernel: sdf: sdf1
Jul 5 21:59:43 YURIANAS kernel: sd 7:0:0:0: [sdf] Attached SCSI disk

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Jul 5 21:59:43 YURIANAS kernel: sd 7:0:0:0: [sdf] 46875541504 512-byte logical blocks: (24.0 TB/21.8 TiB) Jul 5 21:59:43 YURIANAS kernel: sdf: sdf1 Jul 5 21:59:43 YURIANAS kernel: sd 7:0:0:0: [sdf] Attached SCSI disk

• But later, I get an XFS error:

Jul 6 11:49:21 YURIANAS kernel: device offline error, dev sdf, sector 23624466960 op 0x1:(WRITE)
Jul 6 11:49:21 YURIANAS kernel: XFS (sdf1): log I/O error -19
Jul 6 11:49:21 YURIANAS kernel: XFS (sdf1): Filesystem has been shut down due to log error (0x2).

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Jul 6 11:49:21 YURIANAS kernel: device offline error, dev sdf, sector 23624466960 op 0x1:(WRITE) Jul 6 11:49:21 YURIANAS kernel: XFS (sdf1): log I/O error -19 Jul 6 11:49:21 YURIANAS kernel: XFS (sdf1): Filesystem has been shut down due to log error (0x2).

• Then the system cannot access the block device anymore:

Jul 6 12:10:54 YURIANAS kernel: /dev/sdf1: Can't lookup blockdev

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Jul 6 12:10:54 YURIANAS kernel: /dev/sdf1: Can't lookup blockdev

• And finally:

Jul 6 12:11:50 YURIANAS kernel: XFS (sdf1): Unmounting Filesystem

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Jul 6 12:11:50 YURIANAS kernel: XFS (sdf1): Unmounting Filesystem

After this point, the mount/unmount buttons disappear (grey out) and the drive ends up with an icon that says "Unallocated Device" array, even though it's not part of any array.

This seems to happen frequently after a few hours of uptime.

My questions:

1. Is this a known issue with external USB drives on Unraid?

2. Is the XFS log I/O error due to power saving, USB disconnect, or something else?

3. How can I avoid the system treating the drive as an Array disk after failure?

4. What’s the proper way to recover from this without rebooting?

Thanks in advance for your help. Let me know if you need full diagnostics or more logs.

Edited July 6, 20251 yr by yamanobe

Please post the diagnostics