Re: Power 9 disk config -- MIDRANGE-L

True.

And the number of times the console is set correctly - mmmmm I love
Function 65, 21, 11 over and over and over and over and ...

Don Brown

From: "Jim Oberholtzer" <midrangel@xxxxxxxxxxxxxxxxx>
To: "Midrange Systems Technical Discussion"
<midrange-l@xxxxxxxxxxxx>
Date: 14/09/2018 07:38 AM
Subject: Re: Power 9 disk config
Sent by: "MIDRANGE-L" <midrange-l-bounces@xxxxxxxxxxxx>

Don:

Since we almost always wind up re-doing whatever RAID/DASD set up the
factory did, I always order with no protection enabled. Then when we build
the box we will build it to the needs/taste. Sometimes it takes a while
longer to get the disk ready but then it's done the way the customer wants
it to start with. It's rare when we can just look at it and start
restoring/building partitions.

Jim Oberholtzer
Chief Technical Architect
Agile Technology Architects

On Thu, Sep 13, 2018 at 4:26 PM, Don Brown <DBrown@xxxxxxxxxx> wrote:

It is a base system with one core active and 64GB memory and single
partition

They wanted the SSD's for the 'gofaster' as you put it.

Yes the RAID10 will provide best write performance which is what they
wanted

Not huge I/O

Interesting you can not order this config direct from plant, all drives
will arrive configured in RAID10 and I will have to remove the SAS drives
and start the RAID5 set.

Thanks for the feedback

Don Brown

From: "DrFranken" <midrange@xxxxxxxxxxxx>
To: "Midrange Systems Technical Discussion"
<midrange-l@xxxxxxxxxxxx>
Date: 14/09/2018 12:57 AM
Subject: Re: Power 9 disk config
Sent by: "MIDRANGE-L" <midrange-l-bounces@xxxxxxxxxxxx>

I WILL say this is the first time I have every seen this configuration.
We don't see a lot of RAID 10 but it DOES have one advantage in that
there is one write to the RAID 10 set which in turn writes to two
drives. Compare this to IBM i mirroring where IBM i would do a separate
write to each drive of the mirrored pair.

With these two sets as suggested you will have one 'owned' by each of
the SAS controllers in the system so that's good for performance.

I am not seeing any huge red flags here for a small system.

Unknown details of course such as are they turning up all four cores and
expecting to blast a ton of I/O? Or is this a basic system with one
core, perhaps 32GB of memory and they just want SSDs in there to add a
bit of 'gofaster' to the system.

- Larry "DrFranken" Bolhuis

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

On 9/12/2018 7:47 PM, Don Brown wrote:

I am configuring a new power 9 for a customer a 9009-41A

This system has a maximum of 10 internal drives.

Requirement is for;

4 x 931GB SSD in RAID10
4 x 283GB SAS in RAID5

I am trying to determine if there is a possibility of a performance

issue

between the two raid sets ?

My concern was raised when I got an email from IBM with "You will not

get

any performance guarantees!"

Customer is requesting the SSD's in RAID10.

I know there are a number of BP's on this list - any comments on this

disk

config ?

Thank you

Don Brown

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