robvil Posted March 10, 2008 Report Share Posted March 10, 2008 Hi, I am using the last version with a Tandberg T40 tape library. While transfer my backup sets from disk to tape has a okay speed of 1200Mb the verify process is relative slow. That´s about 200Mb. How come the big speed difference? Robert Quote Link to comment Share on other sites More sharing options...
Mayoff Posted March 10, 2008 Report Share Posted March 10, 2008 What type of verify are you doing? Which verify method? What is the computer speed? How much RAM? Big files or small files on the backup? Quote Link to comment Share on other sites More sharing options...
robvil Posted March 10, 2008 Author Report Share Posted March 10, 2008 I have chosen the first option saying: "media verification - compare the files on the destination media to MD5 digests generated during copy". Some backupsets contains few large files and other contains many small, but all seems to be "to slow" during verify/compare, but during transfer it runs very fast. It's a 3Ghz pentium with 1.5Gb memory. Quote Link to comment Share on other sites More sharing options...
Mayoff Posted March 10, 2008 Report Share Posted March 10, 2008 You might want to try switching to thorough verify to see what the speed is like. In some environments, media verification is not as fast as thorough. You can also try to turn off the MD5 options in Configure>Preferences for higher performance. Quote Link to comment Share on other sites More sharing options...
robvil Posted March 10, 2008 Author Report Share Posted March 10, 2008 You might want to try switching to thorough verify to see what the speed is like. Might be a stupid question, but where do I do that? I cannot find this option the the script You can also try to turn off the MD5 options in Configure>Preferences for higher performance. What impact will this have if I turn this of? Quote Link to comment Share on other sites More sharing options...
Mayoff Posted March 10, 2008 Report Share Posted March 10, 2008 Verify options are under Options when you edit the Script. Turning off MD5 will prevent you from doing a verify using MD5 hash data at a later date (like we did in 7.0 and earlier). Quote Link to comment Share on other sites More sharing options...
robvil Posted March 10, 2008 Author Report Share Posted March 10, 2008 Turning off MD5 will this enable thorough verification? Quote Link to comment Share on other sites More sharing options...
Mayoff Posted March 10, 2008 Report Share Posted March 10, 2008 Yes, it will....although that isn't the way you normally do it. All backup scripts have an option for MD5 or thorough verification. You may need to switch to advanced mode first. Quote Link to comment Share on other sites More sharing options...
robvil Posted March 10, 2008 Author Report Share Posted March 10, 2008 I must be blind. I can only find fewer choices and more choices on my script transfer my backupsets to tape? And there I can only find the MD5 options as I can in preferences. Quote Link to comment Share on other sites More sharing options...
Mayoff Posted March 10, 2008 Report Share Posted March 10, 2008 You are right. I forgot you are doing a transfer and not a backup. Transfer only has On/Off. You can try this: Leave the MD5 preference options in the default Turn off verify for the transfer After the transfer is completed, go to Tools>Verify and verify the backup set (if needed). I suspect it will be faster following the transfer operation. Quote Link to comment Share on other sites More sharing options...
robvil Posted March 10, 2008 Author Report Share Posted March 10, 2008 and just to be sure you mean verify the backupset on the tape media after the transfer is done? Quote Link to comment Share on other sites More sharing options...
Mayoff Posted March 10, 2008 Report Share Posted March 10, 2008 The destination used in the transfer operation. Quote Link to comment Share on other sites More sharing options...
robvil Posted March 10, 2008 Author Report Share Posted March 10, 2008 Thank you, I will try it as soon as possible. Quote Link to comment Share on other sites More sharing options...
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