Hi All, we normally recommend 'not using TSM Compression' becaus the fantastic 3592-drives are doing the compression very well and fast.
If users want to encrypt their data with the tsm-client I tend to recommend also using compression because data would be first get compressed and then get encrypted (on the client). This should help save some space on the tapes but it is only an assumption and possibly compression is not essential. my question is If I have a 10GB file and this would appear (without Client-compression and without client-encryption) as 6GB on the tape (after the hardwarecompression) ... ... is it possible to say something about what happens if I set up TSM Encryption (AES128) and send this file again - now encrypted ? Wil this data appear more at around 6GB, more at around 10GB, somewhere between ? Or is it something completely unpredictable ? Statistics would be also interesting If it is more at 10GB it makes sense using TSM client-compression just to save space. Because of the recently discussed problems with restoring tsm-compressed data that is aleady compressed by any software then the comressalway-Option shouldn't also be used there to avoid problems at restore-process ? thanks in advance for any hints Rainer -- ------------------------------------------------------------------------ Rainer Wolf eMail: rainer.w...@uni-ulm.de kiz - Abt. Infrastruktur Tel/Fax: ++49 731 50-22482/22471 Universitaet Ulm wwweb: http://kiz.uni-ulm.de