udev names /dev/sd* - what happens if they change ?

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Hi,

just a small question: Createing a new OSD i use  e.g.
	ceph-deploy osd create ceph-node1:sdg:/dev/sdb5

Question: What happens if the mapping of my disks changes (e.g. because adding new disks to the server)
	sdg becomes sgh
	sdb becomes sdc

Is this handled (how?) by ceph? I cannot find any udev-rules for dev mapping... 
Or is it in my scope to add udev persistent rules ?

thx
Danny

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