compressed backup size differ between the band and hard drive

It is out of curiosity. EE on OEL 5.6 DB (64 bit) + Compression Adv.


The disc and sbt_tape are configured for compressed backupsets

compression algorithm is set to 'HIGH '.

If I backup to disk, it takes 1.5hrs and produces a backup 10 GB piece.

If I backup to tape, it takes 5 hours and produced a 27 GB backup piece.

I look at 'top', it seems that 1 core working 100% with the majority of which (> 90%) being "user" (that's to say not i/o-bound or wait)

(part of the 10 GB backup tape backup takes < 2 min over a link to 1GigE)

Has anyone else seen this type of difference in size when they perform a compressed disk vs. tape backup?

Is this supposed to happen?

Should I be worried?

Thank you very much for any information.


After several Reading the Famous Mwill integrate, it seems that "compression unused block" is shot in for the DISCS.

RMAN backup concepts

So, Yes.  An algorithm different is used between the DISCS and SBT_TAPE.


Tags: Database

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