Cisco C240 M3 disks not working

[dTouch]

Hello!

I have a Cisco C240 M3 server with 24 2,5" HDD slots. When I try to add more than 12 disks some of the disks are not detected and show the yellow warning light.

Does anyone know how to resolve the issue?

[Kirk J]

Greetings.

You might want to check and confirm both SAS cables are plugged up to the sas expander card ports..

https://www.cisco.com/c/en/us/td/docs/unified_computing/ucs/c/hw/C240/install/C240/raid.html#70368

I believe slots 1-12 are cabled to SAS cable 1, and 13-24 are on SAS cable #2.

I would check to see that the cable is correctly connected on both the controller and the sas expander ports.

Kirk...

[dTouch]

Both of the sas connectors are pluged in. The ports stop working in random
order as soon as the 13th disk is inserted.

E.g. If i insert 12 disks all of the will work, but as soon as i insert the
13th it dosen't. But then when i remove any other disk and reseat the
13th(again only 12 disks are left in total) disk it starts working and is
detected.

It's very strange.

[Kirk J]

That sounds like you either have a bad Raid controller or Backplane.

The server under any kind of a contract?  Now would be good time for a TAC case...

Kirk...