When setting up the data tier use a reasonable size
When setting up the data tier use a reasonable size

Choose a size that is as large as a single cache block.

Signed-off-by: mulhern <7b51bcf507bcd7afb72bf8663752c0ddbeb517f6@redhat.com>

stratis-storage/stratisd,stratis-storage/stratisd,mulkieran/stratisd,trgill/stratisd,mulkieran/stratisd,trgill/stratisd,stratis-storage/stratisd