Disk in linear mdraid array is failing, any way to salvage data?

So, I have a linear array which looks like this:

# cat /proc/mdstat Personalities : [raid0] [raid1] [linear] md0 : active linear sda[0] sdb[1] 240129664 blocks 64k rounding 

So smartd and dmesg both tell me sdb is going to die real soon.

Is there any way to relocate the data to sda (and resize the fs) before it's gone for good?