MSA2012 Disk firware update

Hello Friends,

Can I update a disk firmware online on a MSA2012fc ? I suppose it's not a good idea if the disk is part of a Vdisk, but if its state is "AVAIL" , out of any Vdisk, is it safe update it online? Coud this procedure be unsafe for the concurrent I/O transactions at the Vdisks?

Thanks in advance for any help.