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I'm trying to reorganize VD on Dell R720xd without reboot.

iDRAC queues VD deletion for reboot time. A hack with installing LSI MegaRAID Storage Manager GUI refuses to delete VD saying "this is an os drive"

The drive is not mounted anywhere.

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Turns our I had to delete all signs of partition tables from the VD, mine was GPT so I used gdisk /dev/, then used options

Command (? for help): x

Expert command (? for help): z
About to wipe out GPT on /dev/sdd. Proceed? (Y/N): Y
GPT data structures destroyed! You may now partition the disk using 
fdisk or other utilities.
Blank out MBR? (Y/N): Y

and then MegaRAID Storage Manager finally agreed to delete the VD..

UPD: + it took me some time to find a command for CentOS/RedHat to make fdisk realize the changed size of my /dev/sdd, the command is:

echo 1 > /sys/block/sdd/device/rescan

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