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Title
NDMP Isilon backups snapshots taking considerable filer storage space -
Description
NDMP backups on Isilon running OneFS are snapshot based. Each backup with dump level 0 to level 10 takes storage space on the filer adding up to a considerable percentage of the total available capacity. Is it possible to change the backups from SNAPSHOT to TIMESTAMP mode going forward? What are the consequences?
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Resolution
Changing the backup mode on the selection set of a backup job of an Isilon filer from SNAPSHOT to TIMESTAMP will delete the corresponding snapshot stored on the filer on the job subsequent run. SNAPSHOT mode is used to quickly detect changed files; therefore, it should be used when the backup job involves multiple small-size files. For larger files, a timestamp comparison should suffice.