Add hotplug scsi disks

Hello,

I hope this is not the wrong list. If it is please tell me where I can send my question.

we have a dtp raid array controller. I added two disk and used dptutil to put them in raid1.

I tried with mkreiserfs but it tells me that

	mkreiserfs 3.6.2 (2002)

	count_blocks: open failed (No such device or address)
	Aborted

What command must I use to let Linux know about this additional disk ?

Regards
Andreas