Adding LTO5 drives shouldn't cause any trouble. They'll be able to
read/write your current LTO4 tapes.
The fun will begin once you add LTO5 tapes in the library.
These tapes cannot be used by the LTO4 drives so, you'll likely have to
create a different pool form them and select only the LTO5 drives for that
pool.
You can avoid that by replacing your LTO4 drives with LTO5 ones.

Hoping this helps.

Valère Binet

On Tue, Nov 6, 2012 at 10:01 AM, xbosson
<networker-forum AT backupcentral DOT com>wrote:

> Hello,
>
> My current Physical Library is a Quantum Scalar I500 with 4 LTO-4 drives.
> I have frre space to install 2 additionnal drives but I 'm woindering if
> can install LTO-5 drives. How the libray and networker will operate with 4
> LTO-4 + 2 LTO-5 drives ?
>
> Thx !
>
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