Re: Recovering thin provisioned/compressed space

Rob,
Unfortunately I cannot carve this disk out, since the whole reason for
keeping it is that it's the LS, I could play with the CRTNWSSTG command a
bit, ENDALC on the other drives and force the creation of NWSSTGs on that
one drive. Even if I can't exactly fill the disk it should zero a fair bit
of it...
Thanks for the idea!

On Wed, Dec 13, 2017 at 3:21 PM, Rob Berendt <rob@xxxxxxxxx> wrote:

The S/36 had an option on their DELETE command to write binary zeros over
the item you were deleting.

Somehow you can try to segregate this old "disk" into it's own ASP. And
once there, fill it up with gibberish. I find the fastest easiest way on
machines with physical disk is the CRTNWSSTG command. If you're busting
for time you can submit multiple of these.


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: Roberto José Etcheverry Romero <yggdrasil.raiker@xxxxxxxxx>
To: Midrange Systems Technical Discussion <midrange-l@xxxxxxxxxxxx>
Date: 12/13/2017 12:37 PM
Subject: Recovering thin provisioned/compressed space
Sent by: "MIDRANGE-L" <midrange-l-bounces@xxxxxxxxxxxx>



Hello list,

A few days ago I finished migrating a customer from an old v7000 gen1 to a
new v9000. One of the things I proposed was to take advantage of the
compression feature, which works as advertised.
The only caveat found is that the original implementation lacked the
correct ammount of arms x Gb (some documents I found recommend LUNs no
larger than 150Gb) And since you cannot migrate a Load Source drive to a
smaller disk I was forced to do *ENDALC on it for the data to distribute
itself on the remaining drives (I'm talking 800Gb LS vs 146Gb LUNs).

Now, It would seem that STRASPBAL *MOVDTA only moves the data but doesn't
write zeros or otherwise erase the data from the actual disk.
Is there any command to ask the OS or LIC to zero the FREE space on the
drive?
I don't expect IBM i to have space reclamation integrated into the disk
management, but maybe there is or there should be some command to ask for
zeroing of the free space?
Current OS on the machine is 6.1 if it matters.

Thanks in advace for any tips, maybe this ends up being an RFE if it
doesn't exist?

Roberto
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