You will also have an issue on the type of data that your save is. I
have seen comparisons that use different workloads for comparing virtual
tape to LTO3.
For example, in a large file workload the save portion for virtual tape
was 55% less than a straight LTO3 save. Add the DUPTAP process it was
42% longer but the actual save time was faster. In a user mix workload
the virtual tape was 42% faster on the save and only 5% longer end to
end.
I believe this information is covered to some degree in the Performance
Capabilities reference section 15.18.
As mentioned your mileage may vary - save performance is dependant upon
many factors. However, given an equal set of equipment it seems that
virtual tape should give you a 40% to 50% reduction on the save portion
of your process. Not to shabby.
Michael Crump
Manager, Computing Services
Saint-Gobain Containers, Inc.
1509 S. Macedonia Ave.
Muncie, IN 47302
765.741.7696
765.741.7012 f
If your attack is going well, you have walked into an ambush.
This email and its attachments may be confidential and are intended
solely for the use of the individual to whom it is addressed. Any views
or opinions expressed are solely those of the author and do not
necessarily represent those of Saint-Gobain. If it did, it would be
folded, mutilated, watered down, politically corrected, and would show
up a week later if at all. If you are not the intended recipient of
this email and its attachments, you must take no action based upon them,
nor must you copy or show them to anyone.
Please contact the sender if you believe you have received this email in
error.
-----Original Message-----
From: midrange-l-bounces@xxxxxxxxxxxx
[
mailto:midrange-l-bounces@xxxxxxxxxxxx] On Behalf Of Lukas Beeler
Sent: Thursday, June 14, 2007 3:36 PM
To: Midrange Systems Technical Discussion
Subject: RE: LTO3 VS Virtual Tape.
You can't really compare a given tape drive to Virtual Tapes without
exactly specifying what kind of IO subsystem you have for your virtual
tapes.
It would make a lot of sense to separate the virtual tapes into their
own ASP, so your reads don't interfere with your writes.
Virtual tape speed is only limited by your IO subsystem aka buy more
disks, get more speed.
-----Original Message-----
From: midrange-l-bounces@xxxxxxxxxxxx
[
mailto:midrange-l-bounces@xxxxxxxxxxxx] On Behalf Of Harvell, Joel
Sent: Thursday, June 14, 2007 9:18 PM
To: Midrange-l@xxxxxxxxxxxx
Subject: LTO3 VS Virtual Tape.
Has anyone done any performance comparisons between LTO3 Drives versus
Virtual tape? I'm looking for some help with my shrinking backup
window.
Thanks
Joel B. Harvell
Food Lion, LLC
(704) 633-8250 x2709
jbharvell@xxxxxxxxxxxx
************************************************************************
**
This electronic message may contain confidential or privileged
information
and is intended for the individual or entity named above. If you are
not the intended recipient, be aware that any disclosure, copying,
distribution or use of the contents of this information is prohibited.
If you have received this electronic transmission in error, please
notify
the sender immediately by using the e-mail address or by telephone
(704-633-8250).
************************************************************************
**
midrange.com
