If you do not need the virtual disk on MD1200 you can delete all virtual disk using H180 controller configuration utility before removing the enclosure. It is recommended to power off the server first then MD1200. Once both devices are powered off,  you can remove SAS cables.
Hi all, I have a DELL PowerEdge R720xd running Linux, directly attached via SAS to an MD1200 using a PERC H810 controller. This machine has a very annoying problem: when there is a power failure, it boots with all disks in a failed state (blinking orange). Every time this happens I need to pull them out and push them back in so they change to a foreign state (solid green) and then recover the raid configuration. I have now  moved this data in a safer place and I want to remove the MD1200 so that the server can boot fine without breaking. Can I just umount relevant virtual disks, disconnect the external SAS cable and turn the MD1200 off or do I need to clear the configuration somehow? Can I do this while the system is running? Tank you for any advice
Disconnect a MD1200 DAS from a PowerEdge R720xd