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 <ddunham AT taos DOT com> 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 ddunham AT taos DOT
> com
> 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. >
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