growing md-raid5 with a larger disk then others are

[Daniel Koch <koch.daniel.89@googlemail.com>]

Hey there,
I want to grow my md-raid5 which has 4 Disks each 1,5TB. I have a disk here 
which is 2,0TB and i need to know if it is save to do that. 
I know if i am using a 2,0TB disk it would appear as 1,5TB.
Anybody did that before ? Something have an eye on ?
Thank you for your help.
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Daniel Koch