Re: Full save to virtual tape?

I tested this "Long Long ago" and it does make a difference for sure. One issue today is often we see storage is on SAN so even though a different iASP to IBM i it may very well be the same disks underneath which would negate the benefits.

- Larry "DrFranken" Bolhuis
www.Frankeni.com
www.iDevCloud.com - Personal Development IBM i timeshare service.
www.iInTheCloud.com - Commercial IBM i Cloud Hosting.

On 3/5/2019 3:59 PM, Paul Roy wrote:

Did someone ever tested virtual tape performance on a dedicated ASP?
If it behaves as I suppose, this could be performing very fast...
(sequential IO to a dedicated disk SBS...)
I remember (20 years ago) testing backup to a savf in a user ASP and it
was much faster than in the system ASP..

just thinking

Paul




From: DrFranken <midrange@xxxxxxxxxxxx>
To: Midrange Systems Technical Discussion
<midrange-l@xxxxxxxxxxxxxxxxxx>
Date: 05/03/2019 21:51
Subject: Re: Full save to virtual tape?
Sent by: "MIDRANGE-L" <midrange-l-bounces@xxxxxxxxxxxxxxxxxx>



In 2003 that would likely have been an LTO1. LTO2 as only released in
2003. That LTO1 was a big pokey.


- Larry "DrFranken" Bolhuis

www.Frankeni.com
www.iDevCloud.com - Personal Development IBM i timeshare service.
www.iInTheCloud.com - Commercial IBM i Cloud Hosting.

On 3/4/2019 4:22 PM, Justin Taylor wrote:

Excellent point, but I don't have a great answer.

It was an external tape library that we bought in 2003. I think the

tapes resembled the LTO5 we have now. If LTO existed back in 2003, it
might have been whatever generation of LTO was current (but not bleeding
edge).

-----Original Message-----
From: Rob Berendt [mailto:rob@xxxxxxxxx]
Sent: Monday, March 04, 2019 2:43 PM
To: Midrange Systems Technical Discussion

<midrange-l@xxxxxxxxxxxxxxxxxx>

Subject: RE: Full save to virtual tape?

What you left off was what tape drive were you using on that 810.

-----Original Message-----
From: MIDRANGE-L <midrange-l-bounces@xxxxxxxxxxxxxxxxxx> On Behalf Of

Justin Taylor

Sent: Monday, March 4, 2019 3:37 PM
To: Midrange Systems Technical Discussion

<midrange-l@xxxxxxxxxxxxxxxxxx>

Subject: RE: Full save to virtual tape?

I started using virtual tape on an 810 iSeries running v5r4. At the

time, the performance difference was night-and-day. I've been a believer
since. That initial experience is dated and could probably use with a
good reassessment.

For daily backups, we take the system into a pseudo-restricted state and

backup to virtual tape. Then we bring all the subsystems back online and
dupe to 1 or 2 physical tapes.

I was hoping to shorten my periodic maintenance window on the new server

with virtual tape. The consensus is that that's a pipe dream.

Thanks