IBM E16RMLL-I Implementation Guide - Page 58
Archive retention period, Off-site copies, Onsite collocation
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2.3.6 Archive retention period Determine how long you want to keep a file that is archived. Many sites set up a limited number of data groups with standard archive retention periods, such as seven days, 31 days, 180 days, 365 days, or 7 years. Nonstandard requests for archive retention periods are slotted into the next larger retention period group. This reduces management complexity at the expense of keeping some data longer than actually required. If every nonstandard request is honored, the number of groups quickly becomes unmanageable. On the other hand, you can use the backup set feature to retain all nonstandard backup requirements, or even just use backup sets instead of archive. 2.3.7 Off-site copies Determine whether you want to send a copy of the data off-site. Copying data to a removable device like tape allows the data to be taken off-site. An off-site copy along with other procedures provides recoverability in the event that the Tivoli Storage Manager server becomes unusable, or that data on the Tivoli Storage Manager server becomes corrupted. Enter Yes to use off-site copies or No to not use off-site copies. 2.3.8 Onsite collocation Determine whether you want to use onsite collocation. Tivoli Storage Manager uses collocation to dedicate as few tapes as required to hold all of one client's files. Collocation reduces elapsed time for multiple file restores and full client restores at the expense of using more tapes, potentially increasing backup times and increasing Tivoli Storage Manager management time for migration and for storage pool copies. Collocating by client allows as many clients to be restored simultaneously as you have tape drives. If you have stringent restore requirements and sufficient tape drives, then collocation makes good sense. Table 2-6 highlights some factors affecting whether to use collocation. Table 2-6 Factors affecting collocation Onsite collocation Off-site collocation Short restore window Yes Yes Less than 10 Clients, each 10 GB storage No No 28 IBM Tivoli Storage Manager Implementation Guide
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