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  3. May 2016

Re: Disk Block Size

Now you have to compare SSD or SSD + EasyTier configs on a v7k gen2 or
v9000 all-flash plus the cards to attach it. EasyTier loses some oomph when
working with IBMi AFAIK but its still a good investment. A good sizing
might be able to tell you which way is the best to go.


On Wed, May 4, 2016 at 11:28 PM, Steinmetz, Paul <PSteinmetz@xxxxxxxxxx>
wrote:

Ball park figures.

12 TB of SSD using the new 1.55 SSD - 11 x 8,000 = $88,000 - (lose two to
Raid5 plus 1 for hot spare)
2 EJ14 DASD controllers - 2 x 7,000 = $14,000
-------------
$ 102,000

Now I need to sell this for an R&D LPAR.

-----Original Message-----
From: MIDRANGE-L [mailto:midrange-l-bounces@xxxxxxxxxxxx] On Behalf Of
Steinmetz, Paul
Sent: Wednesday, May 04, 2016 10:14 PM
To: 'Midrange Systems Technical Discussion'
Subject: RE: Disk Block Size

Good SSD link

http://www.itjungle.com/tfh/tfh050216-story01.html

Paul


-----Original Message-----
From: MIDRANGE-L [mailto:midrange-l-bounces@xxxxxxxxxxxx] On Behalf Of
Pete Massiello - ML
Sent: Wednesday, May 04, 2016 9:38 PM
To: Midrange Systems Technical Discussion
Subject: RE: Disk Block Size

I don't know the numbers for the 5913 to EJ14, but the EJ10 comes between
them, and I believe the difference between the EJ10 and EJ14 was like 20%
more IOPs. Of course, you disks have to be able to handle that. This is
where SSDs are so powerful, as they can run at a much higher rate to match
that of these better controllers.

I know from the recent announcement, that the EJ14 can do 878K IOPS in the
70/30 read to writes mixture. That is amazing results, and I would assume
that there were SSDs behind that EJ14 to get those IOPS.

Pete

Pete Massiello
iTech Solutions
http://www.itechsol.com
http://www.iInTheCloud.com

Office: 203-744-7854




-----Original Message-----
From: MIDRANGE-L [mailto:midrange-l-bounces@xxxxxxxxxxxx] On Behalf Of
Steinmetz, Paul
Sent: Wednesday, May 04, 2016 9:10 PM
To: 'Midrange Systems Technical Discussion'
Subject: RE: Disk Block Size

Pete,

Thanks for the input.
I always prefer to keep it simple KISS.

Are there any performance number comparing the latest internal DASD
controllers and SSD vs external with the latest FC adapters with
comparable SSD?

Also, how much of an improvement if only upgrading from 5913 to EJ14?.

Paul

-----Original Message-----
From: MIDRANGE-L [mailto:midrange-l-bounces@xxxxxxxxxxxx] On Behalf Of
Pete Massiello - ML
Sent: Wednesday, May 04, 2016 8:58 PM
To: Midrange Systems Technical Discussion
Subject: RE: Disk Block Size

You can connect your SAN to IBM I either via Fabric (meaning it goes via a
switch), or Direct (meaning just that directly connected). The (Storwize)
V5000 & V7000 will provide amazing support, and you need to determine the
amount of I/Os that you are going to be performing. Those Storwize devices
can do Encryption at rest, or easy tier (where it moves hot data to SSDs
and cold data to spinning drives) for improved performance. You can also
connect a Flash System in the same way to IBM i. You do need to be on 7.2
and TR2 (I think ) for Flash. There are some pretty fast Fibre adapters
out there as well.

With all that said, if you are looking for speed, simplicity, and a lower
cost, put internal SSDs and they will probably be more than enough for 80%
of IBM i shops. Especially running the new SSDs just announced with the
EJ14 disk controllers, that is a lot of IOPs there.

Pete

Pete Massiello
iTech Solutions
http://www.itechsol.com
http://www.iInTheCloud.com

Office: 203-744-7854



-----Original Message-----
From: MIDRANGE-L [mailto:midrange-l-bounces@xxxxxxxxxxxx] On Behalf Of
Evan Harris
Sent: Wednesday, May 04, 2016 6:24 PM
To: Midrange Systems Technical Discussion
Subject: Re: Disk Block Size

Hi Paul

I can't say for certain that VIOS is 100% required. I seem to recall you
can talk to external storage natively depending on what TR and what
configuration, but I have not examined this in detail because our intent is
to use VIOS anyway for a variety of reasons.

The SAN guys keep telling me that I will never they the kind of IO a SAN
can support natively. My feeling is SSDs might do it but the flexibility
and other advantages that a SAN brings to the table make the discussion
about more than just performance (IMO).

On Thu, May 5, 2016 at 10:07 AM, Steinmetz, Paul <PSteinmetz@xxxxxxxxxx>
wrote:

Evan,

Back in 2012, I converted Production LPAR from 15k HDD to 100% 177gb SSD.
Performance was far better than expected, 4x.
In 2015, I migrated all the 177 gb SSD to 775 gb SSD.

R&D LPAR is still on 10k HDD.
I'm looking to improve performance on this LPAR, possibly with my next
upgrade.

I'm looking at external disks as an option.
Correct me if I'm wrong, but external would require VIOS.

Paul

-----Original Message-----
From: MIDRANGE-L [mailto:midrange-l-bounces@xxxxxxxxxxxx] On Behalf Of
Evan Harris
Sent: Wednesday, May 04, 2016 5:57 PM
To: Midrange Systems Technical Discussion
Subject: Re: Disk Block Size

Hi Paul

basically we are analyzing the data as support for a move from
internal disks to SAN storage. Currently we don't have any SSDs and
the disks are a mixture of 140's and 283's.

We are trying to move the discussion away from the "have you decided
on a type" question to a focus on what workload we need to service and
what is the best technical solution. Our preference is a SAN but we
are going to let the data do the talking as to whether that will really
work or not.




On Thu, May 5, 2016 at 9:46 AM, Steinmetz, Paul
<PSteinmetz@xxxxxxxxxx>
wrote:

Evan,

I'd also be interested in the results.
What model disks and controllers are you currently using.
For your replacement, have you decided on a type.
HDD, SSD, or flash.

Paul

-----Original Message-----
From: MIDRANGE-L [mailto:midrange-l-bounces@xxxxxxxxxxxx] On Behalf
Of Evan Harris
Sent: Wednesday, May 04, 2016 3:44 PM
To: Midrange Systems Technical Discussion
Subject: Re: Disk Block Size

That the san guys can import the data.... seriously they went off to
do some modelling. But it should help in understanding debate re
internal vs san disk On 5/05/2016 6:25 AM, "Vernon Hamberg"
<vhamberg@xxxxxxxxxxxxxxx>
wrote:

Hmm - glad it worked - what was the outcome? What did you find out?

Vern

On 5/4/2016 1:20 PM, Evan Harris wrote:

Thanks Sue and Marc

the advice re PDI and Disk Magic 16.4.0 worked like a champ.

For the archives the 16.3.0 version of Disk Magic did NOT work.

On Tue, May 3, 2016 at 7:12 AM, Sue Baker <smbaker@xxxxxxxxxx>
wrote:

Evan Harris
<auctionitis@xxxxxxxxx> wrote on Mon, 02 May 2016 18:38:06 GMT:

thanks for that - will try it out today if possible. Do you
happen to know which file you would need to export or have a
link I could look at ?

Navigate to


https://www.ibm.com/developerworks/community/wikis/home?lang=en#
!/
wi
ki/IBM%20i%20Technology%20Updates/page/Disk%20Reads%20and%20Writ
es
%2
0Detail

IBM i Technology Updates - Disk Reads and Writes Detail is the
name of the page.

--
Sue
IBM North America Advanced Technical Sales Support (ATS) Power
Systems Rochester, MN

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Regards
Evan Harris
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Regards
Evan Harris
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