RE: Virtual tape - Performance difference between LTO 3 & LTO5

Yes. Virtual tape will have some differences but not the same as physical .
I posted a response about that earlier.

One thing Pete points out is the controller card makes a huge difference in
speed, as do the disk on the partition. That said, it a static environment
a Virtual LTO will perform much better than the physical tape counterpart.
In my experience the LTO3 vs. LTO4/5 did not make enough difference to care
about.


--
Jim Oberholtzer
Agile Technology Architects


-----Original Message-----
From: MIDRANGE-L [mailto:midrange-l-bounces@xxxxxxxxxxxx] On Behalf Of
Charles Wilt
Sent: Monday, January 23, 2017 8:13 AM
To: Midrange Systems Technical Discussion
Subject: Re: Virtual tape - Performance difference between LTO 3 & LTO5

Pete,

Re-read the question...

I know physical tape drives matter..the question is do virtual tape drives?

Charles

On Sat, Jan 21, 2017 at 1:19 PM, Pete Massiello - ML <
pmassiello-ml@xxxxxxxxxxxx> wrote:

Incorrect.

There is a speed difference. It's something like the following

LTO4 tops out at 120MB/Sec

LTO5 & LTO6 top out at 180MB/sec

LTO7 tops out at 300MB/sec

Add to this the difference between a 5901 (3GB) and can drive all SAS
tape drives, and an EJ10 (6GB) and can only support LTO5, LTO6, and
LTO7 drives. You will see a difference. I have changed customers who
wanted to keep everything the same and go from LTO4 to LTO6, and they
saw a speed difference. I have also changed customers from Power7
with spinning disks, an LTO4 and a 5901 to a Power8 with spinning
disks, using an LTO7 with a
EJ10 and they saw huge difference. I replaced a Power6 with spinning
disks and LTO4, with a Power8 with SSDs, an EJ10,and LTO7 and saw the
backup go from 11 hours plus (660 minutes) to 1 hour and 50 minutes
(110 minutes). I think some of the improvement was the SSDs getting the

data there quicker.

Tape drives do matter.

Pete

Pete Massiello
iTech Solutions
http://www.itechsol.com
http://www.iInTheCloud.com

Office: 203-744-7854



-----Original Message-----
From: MIDRANGE-L [mailto:midrange-l-bounces@xxxxxxxxxxxx] On Behalf Of
Charles Wilt
Sent: Friday, January 20, 2017 4:23 PM
To: Midrange Systems Technical Discussion
Subject: Virtual tape - Performance difference between LTO 3 & LTO5

Question came up on serverfault...

I don't believe there's any performance difference between virtual
LTO3 & LTO5. I suspect both perform as fast as the disk subsystem allows.

Can anyone confirm or correct me?

Thanks!
Charles
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