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

Not sure if Pete was responding to your question or to Jim's statement
that the jump from physical LTO3 to 4 had a huge speed difference but not
so much for the higher levels. I rather concur with Jim.


Rob Berendt
--
IBM Certified System Administrator - IBM i 6.1
Group Dekko
Dept 1600
Mail to: 2505 Dekko Drive
Garrett, IN 46738
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From: Charles Wilt <charles.wilt@xxxxxxxxx>
To: Midrange Systems Technical Discussion <midrange-l@xxxxxxxxxxxx>
Date: 01/23/2017 09:13 AM
Subject: Re: Virtual tape - Performance difference between LTO 3 &
LTO5
Sent by: "MIDRANGE-L" <midrange-l-bounces@xxxxxxxxxxxx>



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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