What is COSS? COSS is a Cyclic Object storage system originally designed by Eric Stern. COSS works with a single file, and each stripe is a fixed size an in a fixed position in the file. The stripe size is a compile-time option. As objects are written to a COSS stripe, their place is pre-reserved and data is copied into a memory copy of the stripe. Because of this, the object size must be known be