Question: Can DD, TAR or other OS tools be used to back up a database on storage managed by ASM?
Answer: DD, Tar and other OS tools are not supported with ASM. The answer is use Rman with ASM. Matrix for Supported backup or clongin Options:
-----------------------X | DD | No | -----------------------| | Atomic Snaps | Yes | -----------------------| | TAR | No | -----------------------| | RMAN | YES! | -----------------------X
Automic snaps are split mirror technologies which support atomis splits across several LUN as a consistant point in time copy. Products like TimeFinder or MirrorView. Database must be placed in HOT BACKUP mode for this type of backup for the duration of the split. This is because the split can not capture a block-consistent view of all datafiles while the database is open for write. The split is typically a few seconds so the performance impact is minimal.
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