Architecture - HSM

Definitions

 * Primary storage
 * The Lustre file system nearest to the client


 * Backend storage
 * The storage system used for archival of files from the primary system


 * Migration
 * Movement of file data and attributes between the primary and backend storage


 * Copy-in
 * Migration to the primary storage system


 * Copy-out
 * Migration to the backend storage system

Migration API
{|cellspacing="0" border="1" !Id !Quality !Summary
 * HSM-migr-in||Feature||When a file is accessed and is determined to not be in the primary storage the file data is migrated to the primary storage
 * HSM-migr-out||Feature||When a file is selected for migration to the secondary storage system
 * HSM-migr-out||Feature||When a file is selected for migration to the secondary storage system
 * HSM-migr-out||Feature||When a file is selected for migration to the secondary storage system