Darren, Thanks a lot for your explanations.
I have got the part about DLT / DLT2 / DLT3 being "bins" to keep drives separated. Also, will do dd test, thank you for suggestion. I am using Soalris 8 device /dev/rmt/0cbn and I saw on library's LCD that during the backup compression is on. Is this the correct device to use to get max tape capacity? Thank you, Aleksandr On 11/6/07, A Darren Dunham <[EMAIL PROTECTED]> wrote: > On Tue, Nov 06, 2007 at 12:03:19PM -0500, Aleksandr Nepomnyashchiy wrote: > > - Should I "bplabel -d dlt3" for each tape as soon as it expires? > > I don't think you can do that without changing your drive type as well. > I wouldn't bother. > > I might try using 'dd' on a scratch tape to validate the capacity of > them. What 'device' name do you use for the drives? > > > - Why do you think changing from DLT to DLT3 won't change the > > performance? > > Because Netbackup doesn't control the performance of the drives, that's > up to the OS and the driver that communicates with them. > > There's no difference between DLT/DLT2/DLT3 other than as "bins" to keep > tapes and drives separated. If you only have one type of drive, it > doesn't matter which type you use. > > > PS NetBackup 3.4 doesn't support DLTIV, but it supports DLT , DLT2 and > > DLT3. I am using DLT7000 drives with DLTIV tapes and hope to get more > > than 30-40G per tape. > > You should test that outside of netbackup. Put a scratch tape in a > drive and write to it directly. How many 'zeros' (very compressible) > can you put on? How much random data (uncompressible) can you put on? > > -- > Darren Dunham [EMAIL PROTECTED] > Senior Technical Consultant TAOS http://www.taos.com/ > Got some Dr Pepper? San Francisco, CA bay area > < This line left intentionally blank to confuse you. > > _______________________________________________ > Veritas-bu maillist - [email protected] > http://mailman.eng.auburn.edu/mailman/listinfo/veritas-bu > _______________________________________________ Veritas-bu maillist - [email protected] http://mailman.eng.auburn.edu/mailman/listinfo/veritas-bu
