You can do this without any problems…
I’m assuming /dev/sdb is a separate HP Smart Array Logical Drive.
Don’t use any partitioning for this setup… Just create the filesystem on the block device:
mkfs.xfs -f -l size=256m,version=2 -s size=4096 /dev/sdb
When you want to expand at a later date, add disks and expand the HP logical drive using the hpssacli or Smart Storage Administrator tools.
You can rescan the device to get the new size with:
echo 1 > /sys/block/sdb/device/rescan
Confirm the device size change with dmesg|tail.
At that point, you can run xfs_growfs /mountpoint (not device name) and the filesystem will grow online!