History
TSM descended from a project done at IBM's Almaden Research Center around 1988 to back up VM/CMS systems. The first product that emerged was Workstation Data Save Facility (WDSF). WDSF's original purpose was to back up PC/DOS, OS/2, and AIX workstation data onto a VM/CMS (and later MVS) server. WDSF morphed into ADSM.
The TSM database (through release 5.5) is a bespoke B+ tree database with an architectural limit of approximately 530 GB, and 13 GB of log space. Although the TSM database uses many of the same underlying technologies as IBM's DB2, has an SQL engine (though for read-access only), and supports access through ODBC, it used this custom database through release 5.5. Starting with TSM 6.1, released in May 2009, TSM uses a DB2 instance as its database. This removes the previous architectural limits.
Read more about this topic: IBM Tivoli Storage Manager
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