So I decided to update my server from 6.8.3 to the latest 6.9.2. The process seemed to work fine. When the server booted back on, the console was full of :

 

Jul 10 21:12:39 Tower kernel: sas: ata11: end_device-5:0: dev error handler
Jul 10 21:12:39 Tower kernel: ata11.00: qc timeout (cmd 0xec)
Jul 10 21:12:39 Tower kernel: ata11.00: failed to IDENTIFY (I/O error, err_mask=0x4)
Jul 10 21:12:39 Tower kernel: drivers/scsi/mvsas/mv_sas.c 1415:mvs_I_T_nexus_reset for device[0]:rc= 0
Jul 10 21:12:39 Tower kernel: ata11.00: qc timeout (cmd 0xec)
Jul 10 21:12:39 Tower kernel: ata11.00: failed to IDENTIFY (I/O error, err_mask=0x4)
Jul 10 21:12:39 Tower kernel: drivers/scsi/mvsas/mv_sas.c 1415:mvs_I_T_nexus_reset for device[0]:rc= 0
Jul 10 21:12:39 Tower kernel: ata11.00: qc timeout (cmd 0xec)
Jul 10 21:12:39 Tower kernel: ata11.00: failed to IDENTIFY (I/O error, err_mask=0x4)

 

After a LONG time, when I finally got into the web interface, 7 disks were missing.

 

Im guessing they must be all connected to my Marvel Sata card? I know Marvel cards can cause problems but I never had any, for many many years.

 

I reverted back to 6.8.3 and everything was back to normal.

 

Any idea what's wrong?

tower-diagnostics-20210710-2119.zip

See if diasbling IOMMU in the BIOS helps at all.

You can also try this:

https://forums.unraid.net/bug-reports/stable-releases/disks-missing-after-upgrading-to-670-r536/?do=findComment&comment=4583