Hi All,

I have a feeling my server backplane is failing as new drives seem to have issues, but:

Recently had to replace my UNRAID drive (USB). Since then I've been having issues. Shares will disappear from the shares tab and plex keeps having "transcoding" issues. Reboot is a temp fix.

I messed around with cache to array etc which I think I have gotten wrong, so now I need your professionals help.

If i stop the array and try to restart, the WEBUI just goes back to the stopped array status. and I need to reboot again

I'm an amateur so please explain in simple terms if you see the problem please.

unraidnas-diagnostics-20260404-1813.zip

Edited April 4Apr 4 by Plunky

There are issues logged with multipite disks, possibly due to a controller issue:

Apr 4 06:01:30 unRAIDNAS kernel: megaraid_sas 0000:03:00.0: 18526 (828558089s/0x0020/DEAD) - Fatal firmware error: Line 977 in ../../dm/src/dm.c

Apr 4 06:01:30 unRAIDNAS kernel:

Apr 4 06:01:30 unRAIDNAS kernel: megaraid_sas 0000:03:00.0: megasas_disable_intr_fusion is called outbound_intr_mask:0x40000009

Apr 4 06:01:30 unRAIDNAS kernel: megaraid_sas 0000:03:00.0: FW in FAULT state Fault code:0x10000 subcode:0x0 func:megasas_wait_for_outstanding_fusion

Apr 4 06:01:30 unRAIDNAS kernel: megaraid_sas 0000:03:00.0: resetting fusion adapter scsi11.

Apr 4 06:01:30 unRAIDNAS kernel: megaraid_sas 0000:03:00.0: Outstanding fastpath IOs: 2

Apr 4 06:01:30 unRAIDNAS kernel: megaraid_sas 0000:03:00.0: Reset not supported, killing adapter scsi11.

The first recommendation would be to change to an LSI non RAID controller, or flash that one to IT mode if supported.

Thank you!

It should be in IT already. Unless a power outage or the likes has reverted it somehow.

I checked the iDrac and It's PERC H730 Mini and says its on HBA (IT) mode. Have set the iDrac controller setting to set HBA again so it'll apply at next reboot again. So will see how it goes.

I will look at reseating all then cables to it and the backplane if still an issue

1 hour ago, Plunky said:

It should be in IT already

It's not based on the driver it's using. IT mode uses the MPT3SAS driver, not MegaRAID.