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  3. June 2013

Re: LTO4 storage

I just found out that the hard way. I was restoring the v5r3 machine that
got it's cable unplugged while rebuilding the LoadSource. And lo and behold
i faced an "Critical storage condition". I had changed a 5074 exp with lots
of small disk for a 0595 with 12 36G disks. I was just 20Gb under the
original ASP size. They used LTO2 for backup (and a 2849 controller,
SLOOOOOW) so imagine my surprise when a 200Gb tape (200/400) fills a 474Gb
ASP...
Original ASP was 500Gb and was 93% occupied. I thought they must have lots
of spoolfiles or the like for an op21 to occupy only a 200Gb tape, but it
seems DB2 data is highly compressible.

Best Regards!


On Mon, Jun 10, 2013 at 9:50 AM, <rob@xxxxxxxxx> wrote:

These numbers are in MB. So the one fit 3TB on one LTO4 and had room to
spare while the other only had 0.7TB and went to a second tape.

Rob Berendt
--
IBM Certified System Administrator - IBM i 6.1
Group Dekko
Dept 1600
Mail to: 2505 Dekko Drive
Garrett, IN 46738
Ship to: Dock 108
6928N 400E
Kendallville, IN 46755
http://www.dekko.com





From: rob@xxxxxxxxx
To: midrange-l@xxxxxxxxxxxx,
Date: 06/10/2013 08:31 AM
Subject: LTO4 storage
Sent by: midrange-l-bounces@xxxxxxxxxxxx



I am noticing that DB2 or 'traditional' stuff really compresses when
saving to tape but stream file stuff doesn't.
I have one system that is primarily 'traditional' stuff and PRTERRLOG
TYPE(*VOLSTAT) VOLTYPE(3590) after a full system save says it fit
3,087,925 on one LTO4 tape and that got everything.
I have another system that's primarily stream file stuff and it only fit
1,024,936 on one tape and 689,570 on the second.
Full system saves, identical control groups. Saved with BRMS.
Perhaps stream file are generally more compressed while DB2 stuff keeps
all that non variable length data all filled with blanks and stuff.


Rob Berendt
--
IBM Certified System Administrator - IBM i 6.1
Group Dekko
Dept 1600
Mail to: 2505 Dekko Drive
Garrett, IN 46738
Ship to: Dock 108
6928N 400E
Kendallville, IN 46755
http://www.dekko.com

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