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  3. August 2022

Re: VTLs and backup time

A switch is not needed depending on how the interfaces are set up.

Now would I put up VIOS to virtualize all of this with a 32Gb switch and
Interface cards, yes I would, however with an installed system that very
likely has internal storage that's not a reasonable option. Fibre switches
are very pricey, so if you can avoid one do so. They also require someone
who knows how to manage them.

--
Jim Oberholtzer
Chief Technical Architect
Agile Technology Architects


On Thu, Aug 18, 2022 at 2:32 PM Rob Berendt <rob@xxxxxxxxx> wrote:

We're still on 8GB fiber until we get a new switch.

Rob Berendt
--
IBM Certified System Administrator - IBM i 6.1
Group Dekko
Dept 1600
Mail to: 7310 Innovation Blvd, Suite 104
Ft. Wayne, IN 46818
Ship to: 7310 Innovation Blvd, Dock 9C
Ft. Wayne, IN 46818
http://www.dekko.com

-----Original Message-----
From: MIDRANGE-L <midrange-l-bounces@xxxxxxxxxxxxxxxxxx> On Behalf Of Jim
Oberholtzer
Sent: Thursday, August 18, 2022 3:26 PM
To: Midrange Systems Technical Discussion <midrange-l@xxxxxxxxxxxxxxxxxx>
Subject: Re: VTLs and backup time

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Q1: VTL can be faster, but remember the interface and your DASD
configuration is likely going to be the limiting factor. with a
standalone tape unit, I'm guessing it's a SAS unit. If you went to 16Gb
Fibre with a VTL that can support it (most of them do, I use Cybernetics)
then it is likely to be faster. The caveat comes into play with dedup.
Most VTLs will dedup to cut the storage needed dramatically. If you do
inline dedup (meaning while the backup is running) that is going to slow
the process down. Post dedup will allow the save to run as fast as the
storage and interface can handle it, then do the dedup after it's done. So
it's IBMs favorite answer, it depends..... IE: if you only have 4 DASD
units that would be the limiting factor, VS a SAN, then DASD I/O would
likely be much faster and not a limitation.

Q2, Sure, VTLs can be connected to multiple systems depending on the
interfaces on the VTL and in some cases licensing on the VTL.



--
Jim Oberholtzer
Chief Technical Architect
Agile Technology Architects


On Thu, Aug 18, 2022 at 11:40 AM Gad Miron <gadmiron@xxxxxxxxx> wrote:

Hello sages

As our nightly Prod machine backup time has grown to 7 hours
( SAVLIB *ALLUSER to one stand-alone LTO7 3580 tape )
We look into VTL to speed things up.
But, we must backup to tape also (air gap and such)
So, I think of this scenario:
a. get a VTL and connect it to both the Prod machine and the Dev machine
b. run the same nightly Prod machine backup to a VTL
c. during the day after , use DUPTAP on the Dev machine
to duplicate the Prod backup to tape .(the Dev machine has a 3580 Tape
also)

Now:
Is a back up to a VTL much faster then tape?
Can a VTL be directly connected to 2 machines so that a DUPTAP can be
done?


TIA
Gad
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