Database migration (also known as hierarchical storage management, hsm) is a technology that integrates offline storage and online storage. It uses high-speed, high-capacity off-line storage devices as the next-level devices of disk devices, and then automatically migrates commonly used data in disks to secondary large-capacity storage devices such as tape libraries (tape libraries for short) according to specified policies. When the data needs to be used, the hierarchical storage system will automatically transfer the data from the lower-level storage device back to the upper-level disk. For users, the above-mentioned data migration operation is completely transparent, except that the speed of accessing the disk is slightly slow, and the capacity of the logical disk is obviously greatly improved.
This is the archiving process of moving rarely used or unused files to a secondary storage system such as tape or optical disk. These files are typically image documents or historical information that need to be easily accessible at any time in the future. The migration effort is integrated with the backup strategy, and regular backups are still required. It also includes computer data migration, migrating data, applications, and personalized settings from the old computer (old system) to the new computer (new system), which is necessary after the system upgrade.
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