Hey,
I have a strange issue where when a drive (doesn't matter which) in the array is spun up because Unraid or a container accesses it, it throws a read error. But when I spin the disk up manually from the GUI I don't get any errors.
I tried reseating SATA and power cables, rebooting, updating the drives firmware and even using xfs rather than zfs on one disk to exclude a problem with the filesystem.
When I disable disk spindown the drives behave just fine.

I would be very glad if someone can help me, since I want to reduce my power consumption by spinning the HDDs down.

Best regards
Valentin

unraid-diagnostics-20260326-1722.zip

That looks like a disk firmware issue. What brand are the disks? Don't recognize the models in the SMART reports.

Thanks for the fast response.
These are refurbished HP Enterprise 4TB 7.2k disks (Modell Nr. MB4000GDUPB)

They likely have a firmware that doesn't play nice with spindown.

Hmm...

Is there any way I can change the firmware or find another firmware that works with spin ups/downs?

Or can I ignore this error without risking data loss?

15 minutes ago, walndyn said:

Or can I ignore this error without risking data loss?

The safest thing would be to set the problem drives to never spin down.

^this

Well, this would be all my array drives...

Since the error only occurs when the system is spinning the disk up and not when manually spinning them up, could it be that it tries to read data before the disk is totally ready and the firmware isn't delaying it enough?
If that would be the case, is there a way to tell the system to wait a few seconds after spinning up and before reading the data?

11 hours ago, walndyn said:

If that would be the case, is there a way to tell the system to wait a few seconds after spinning up and before reading the data?

Not AFAIK.