RE: Downgrade from RAID6 to RAID5

Jim,

"Let alone starting the *ADMIN server. How it was configured and shipped by IBM"

Can you detail what you mean by this?
I was not aware of this issue.

I do remember an old thread with Larry concerning the ADMIN2 instance performance issues.

Larry,

That's what I'm seeing.
ADMIN2 job
Taking close to 100% of CPU.

I checked my MPG performance graphs.
Faulting in base pool.
CPU queing

Paul


-----Original Message-----
From: MIDRANGE-L [mailto:midrange-l-bounces@xxxxxxxxxxxx] On Behalf Of DrFranken
Sent: Sunday, March 12, 2017 7:10 PM
To: Midrange Systems Technical Discussion
Subject: Re: V7R1 - why does HTTP Admin instance take so long to stop / start - and taking 95% of CPU

For the production LPAR that's probably about right, actually.

The R&D seems a tad slow and the drives shouldn't be that big of a difference as it's not an I/O thing. It's mostly ADMIN2 cranking on JAVA. Do you see lots of faulting on that one in the pool the server runs (usually *BASE) ??

On mine I see 800 to 900% CPU much of the time while it starts and overall CPU is +++++. WRKSYSACT shows the ADMIN2 server over 40 times!
(40 threads)

On my lab system of course there's just me.

- Larry "DrFranken" Bolhuis

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

On 3/12/2017 6:07 PM, Steinmetz, Paul wrote:

Larry,

R&D LPAR
8205-E6C 1.0 CPU about 8,000 CPW, 80gb mem, 10k spinny
10 minutes to stop, ADMIN2 job need end *immed, 8 minutes to start

Production LPAR
8205-E6C 1.5 CPU about 12,000 CPW, 160gb mem, 100% SSD
30 seconds to stop, 5 minutes to start

Paul

Paul

-----Original Message-----
From: MIDRANGE-L [mailto:midrange-l-bounces@xxxxxxxxxxxx] On Behalf Of Jim Oberholtzer
Sent: Monday, November 27, 2017 8:22 AM
To: 'Midrange Systems Technical Discussion'
Subject: RE: Downgrade from RAID6 to RAID5

There are customers out there with IBM i running on the No Cache option but they are not real happy about it. IPLs take about 15 - 20 minutes, let
alone starting the *ADMIN server. How it was configured and shipped by IBM
I don't know but we see it.

Without major surgery I don't believe they can migrate from one card to the other, although an IBMr told me it was possible. (they are after all just cards in C14/C15)


--
Jim Oberholtzer
Agile Technology Architects

-----Original Message-----
From: MIDRANGE-L [mailto:midrange-l-bounces@xxxxxxxxxxxx] On Behalf Of DrFranken
Sent: Sunday, November 26, 2017 7:07 PM
To: Midrange Systems Technical Discussion; Steinmetz, Paul
Subject: Re: Downgrade from RAID6 to RAID5

True indeed but not an option in his Power7 system. There are only two options for internal RAID cards on that machine. One is a pair of cards with Cache and the other is a single card with no cache. IIRC the second option isn't even supported for IBM i.

- Larry "DrFranken" Bolhuis

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

On 11/26/2017 2:00 PM, Steinmetz, Paul wrote:

Don,

Another option, if possible, would be to use a different raid
controller

with more cache.

This would also reduce your IO.

Paul

-----Original Message-----
From: MIDRANGE-L [mailto:midrange-l-bounces@xxxxxxxxxxxx] On Behalf Of
Steinmetz, Paul
Sent: Saturday, November 25, 2017 6:45 PM
To: 'Midrange Systems Technical Discussion'
Subject: RE: Downgrade from RAID6 to RAID5

Don,

The memory will definitely help, reduce paging which will reduce IO.

Another option I didn't mention is PCI flash adapter.

Paul

-----Original Message-----
From: MIDRANGE-L [mailto:midrange-l-bounces@xxxxxxxxxxxx] On Behalf Of
Don Brown
Sent: Saturday, November 25, 2017 6:39 PM
To: Midrange Systems Technical Discussion
Subject: RE: Downgrade from RAID6 to RAID5

Hi Paul - I have answered your questions below ...
Don Brown




From: "Steinmetz, Paul" <PSteinmetz@xxxxxxxxxx>
To: "'Midrange Systems Technical Discussion'"
<midrange-l@xxxxxxxxxxxx>
Date: 24/11/2017 11:27 PM
Subject: RE: Downgrade from RAID6 to RAID5
Sent by: "MIDRANGE-L" <midrange-l-bounces@xxxxxxxxxxxx>



Don,

1) What feature disk controller are you currently using?
FC5630

2) Do you have a BP, I'm sure they could locate SSD drives.
I am a BP !! I have checked all options I am aware of and nothing NEW
is

available.

3) Did you consider attaching a EXP24S for additional drives?
While this is an excellent option not in current budget.

4) The SSD option will give you 4x the performance, switching from
RAID6

to RAID5 will be slight.

At this stage any gain is a blessing - at EOM system can slow to a
point

where users have trouble logging on.

We are going to add 1 more driver, double memory and switch from RAID6
to

RAID5. I think that is all we can do without SSD's or new box.

5)Also, for future planning - IBM announces end of service dates (no
more
maintenance) for various Power 6 and Power 7 platforms.
Yes i am aware this box has EOL in 2019.

https://www-01.ibm.com/common/ssi/cgi-bin/ssialias?infotype=AN&subtype
=CA&htmlfid=897/ENUS917-163&appname=USN




Paul

-----Original Message-----
From: MIDRANGE-L [mailto:midrange-l-bounces@xxxxxxxxxxxx] On Behalf Of
Don Brown
Sent: Friday, November 24, 2017 1:54 AM
To: Midrange Systems Technical Discussion
Subject: Downgrade from RAID6 to RAID5

Hi All,

Long story short.

Have a system at 7.3 with 6 x 139GB spinning disks RAID6 and a disk
write

performance issue.

As RAID6 will require three writes to update all striping and RAID5
will

need two theoretically converting from RAID6 to RAID5 should provide a performance increase ?

There is no space for additional drives in this system - Mirrored pair
are used in Asp02

SSD's is not an option because both IBM and IBM remarketing both do
not have any of the required drives for this model 8202-E4B

We are considering second hand SSD's but not a preferred option.

Has anyone changed the RAID configuration from 6 to 5 and have any

comments on the process ?

Thanks
Don Brown


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