RE: Downgrade from RAID6 to RAID5

Those are all buried in the LIC and OS anyway so Rob's right, just apply all
the groups and cumulative and you're good to go.


--
Jim Oberholtzer
Agile Technology Architects


-----Original Message-----
From: MIDRANGE-L [mailto:midrange-l-bounces@xxxxxxxxxxxx] On Behalf Of Rob
Berendt
Sent: Tuesday, November 28, 2017 6:33 AM
To: Midrange Systems Technical Discussion <midrange-l@xxxxxxxxxxxx>
Subject: RE: Downgrade from RAID6 to RAID5

Next to impossible to determine what PTF's directly affect option 42. It
would be different if it were a separate LPP. Therefore just reapply the
whole darn cume and all the latest groups.


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
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Kendallville, IN 46755
http://www.dekko.com





From: Don Brown <DBrown@xxxxxxxxxx>
To: "Midrange Systems Technical Discussion" <midrange-l@xxxxxxxxxxxx>
Date: 11/27/2017 07:50 PM
Subject: RE: Downgrade from RAID6 to RAID5
Sent by: "MIDRANGE-L" <midrange-l-bounces@xxxxxxxxxxxx>



Thanks Rob,

Yes journalling is active and used quite heavily after some investigation.

I have downloaded option 42 and installed, now just trying to work out
what PTF's I must install.

Unfortunately I have recently deleted the image catalogues for the latest
collection of PTF's.

Thanks for the tip.



Don Brown





From: "Rob Berendt" <rob@xxxxxxxxx>
To: "Midrange Systems Technical Discussion" <midrange-l@xxxxxxxxxxxx>
Date: 27/11/2017 11:52 PM
Subject: RE: Downgrade from RAID6 to RAID5
Sent by: "MIDRANGE-L" <midrange-l-bounces@xxxxxxxxxxxx>



Don,

Since Larry said this:
<snip>
Performance improvement is there yes as you also remove some reads along
with the extra writes but won't rock your world.
</snip>
I thought I would ask: Are you doing journalling? If so, are you using
5770SS1 42 5117 HA Journal Performance
If not, then I would HIGHLY recommend it.

You mentioned month end. This is exactly why we were hurting also. We
tried moving from spinning disks to SSD's and really did not get the bang
for the buck.
Everything here is journaled as a requirement of our HA software.
Adding option 42 was a serious game changer.

Try a 70 day try-and-buy. Put it on the weekend before your next month
end. Along with the latest PTFs (always a good idea when adding new
options). 70 days should get you through two, possibly 3, month ends.
Hence the reason to not install it too early.
He who signs the checks couldn't wait to sign that check after our lack of


improvement with SSD's.

Downtime due to month end processing was our biggest outage. Saves,
upgrades, etc were easily handled with out HA software.


Rob Berendt