4 The 'ost_id' identifies a single object on a particular OST.
19 The 'ost_id' structure contains an identifier for a single OST object.
20 The 'oi' structure holds the OST object identifier as used with Lustre
21 1.8 and earlier, where the 'oi_seq' field is typically zero, and the
22 'oi_id' field is an integer identifying an object on a particular OST
23 (which is identified separately). Since Lustre 2.5 it is possible for
24 OST objects to also be identified with a unique FID (see
25 <<struct-lu-fid>>) that identifies both the OST on which it resides as
26 well as the object identifier itself.