best practice to wipe a disk array before returning server?

What is the current best practice to wipe a soft raid mdadm disk array before returning it to the host?

Don't trust them to do it right before recycling the hardware.

is hdparm --secure-erase possible on a running system, to affect each individual drive in the soft raid?

I know the dd /dev/zero trick used to be the most popular

 

 

 

 

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