RE: Downgrade from RAID6 to RAID5

Don,

You previously were going to double your memory.

How much memory do currently have?
Did you check your current page faults?
Doubling your memory would be your easiest and quick fix, minimum down time.
I would try this first and measure the improvement.

Paul

-----Original Message-----
From: MIDRANGE-L [mailto:midrange-l-bounces@xxxxxxxxxxxx] On Behalf Of Don Brown
Sent: Monday, November 27, 2017 7:52 PM
To: Midrange Systems Technical Discussion
Subject: RE: Downgrade from RAID6 to RAID5

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