How to get the real device in guest os after attached a disk?

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Hi all,
I have a question as the subject above, the reason I want to know this is that, if I attach some disks on the guest,
for example, I specified /dev/vdc&/dev/vdd(target device) at the cmd line by using 'virsh attach-disk', but they may be /dev/vdb&/dev/vdc in the guest os,
so if the guest user want to detach the /dev/vdb(guest device), he\she will be confused with the two target devices /dev/vdb&/dev/vdc,
because he\she doesn't know the corresponding relation of the guest device and target device, 
he\she may detach an error device /dev/vdd(target device) which corresponding to /dev/vdc(guest device).

Could anyone give me some idea?
Thanks in advance.

Best Regards
Wangpan

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