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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