You could rescan the SCSI host bus by running the following command
echo "- - -" > /sys/class/scsi_host/host0/scan
NOTE: The host0 part of the command above is the host ID. And you might have multiple/other host ID's on your machine. Which means that if the command above doesn't get you the drive back, you might have to change the host ID to ...
You need a SAS HBA. Then use sg_sanitize from sg3_utils package.
sg_sanitize --block /dev/sdX
Overwrite with given pattern:
sg_sanitize --overwrite --pattern=rand.img /dev/sdX
If you only have a RAID controller, than you can create a RAID volume and just fill it with zeroes or some random pattern (see scrub).