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                                           ddunham AT taos DOT com
Senior Technical Consultant         TAOS            http://www.taos.com/
Got some Dr Pepper?                           San Francisco, CA bay area
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