Re: VIOS and Perf Monitoring

Since VIOS is a subset of AIX there are not any really good tools to
monitor I/O there. lvmstat may be the best way to figure that out. I
have not checked to see if that command is in VIOS, but it may be, it's
a staple in AIX. I don't know if MPG's power tools can monitor VIOS, I
know they have one that monitors most Unix variants.

Jim Oberholtzer
Chief Technical Architect
Agile Technology Architects


On 8/25/2011 9:07 AM, Kirk Goins wrote:

Not that all this isn't good discussion<grin>, but my original question

was

basically how to measure disk performance at the VIOS level? If I didn't
use VIOS and hosted all my IBM i on top a IBM i partition I could use the
standard Performance Tools and things like WRKDSKSTS etc.



On Thu, Aug 25, 2011 at 5:06 AM, Jim Oberholtzer<midrangel@xxxxxxxxxx
wrote:

Rob,

You want to have a standard workload you can test with. At V7 use

the

wait accounting tooling built in to the OS. A very good test is

loading

PTFs from an image catalog. On smaller systems ( 4 or< drives) it

is

often faster to load the CDs one by one than use the image catalog.

All

I/O. I think it starts to even out at about 6 drives.

Jim Oberholtzer
Chief Technical Architect
Agile Technology Architects


On 8/25/2011 6:57 AM,rob@xxxxxxxxx wrote:

> If I was to play around and unload/reload a lpar to test this,

what would

> be effective measuring?
>
>
> Rob Berendt
> -- Group Dekko Dept 1600 Mail to: 2505 Dekko Drive Garrett, IN

46738

> Ship to: Dock 108 6928N 400E Kendallville, IN 46755
> http://www.dekko.com From: Kirk Goins<kirkgoins@xxxxxxxxx> To:
> Midrange Systems Technical Discussion<midrange-l@xxxxxxxxxxxx>

Date:

> 08/24/2011 05:04 PM Subject: Re: VIOS and Perf Monitoring Sent

by:

> midrange-l-bounces@xxxxxxxxxxxx According to multiple IBM and

NON-IBM

> sources the answer is along these lines... The OS has no idea if

these

> disks are real or virtual. The OS will only queue so many I/Os

per

> disk arm available ( I think I got that right ). So if the OS

only

> sees one 280GB disk it will not handle I/O as well vs having

eight

> 35GB disk arms. Now the actual number of real disks arms will

affect

> how well this concept works. On Wed, Aug 24, 2011 at 1:17 PM,
> <rob@xxxxxxxxx> wrote:

>> > I am still not getting why the OS needs to see multiple

arms if they

are

>> > all virtual. Instead of one bigger virtual. It's still

physically

> spread

>> > across the multiple arms defined either in VIOS or your

hosting

> partition.

>> > Is it some weird thing like "let's calculate your

journal receiver

size

>> > based on the number of arms you have"?
>> >
>> >
>> > Rob Berendt
>> > --
>> > Group Dekko
>> > Dept 1600
>> > Mail to: 2505 Dekko Drive
>> > Garrett, IN 46738
>> > Ship to: Dock 108
>> > 6928N 400E
>> > Kendallville, IN 46755
>> > http://www.dekko.com
>> >
>> >
>> >
>> >
>> >
>> > From: Kirk Goins<kirkgoins@xxxxxxxxx>
>> > To: Midrange-L<midrange-l@xxxxxxxxxxxx>
>> > Date: 08/24/2011 04:12 PM
>> > Subject: VIOS and Perf Monitoring
>> > Sentby:midrange-l-bounces@xxxxxxxxxxxx

>>>>> > >> >

>> >
>> >
>> > I am getting ready to build a system with VIOS as the

Hosting OS and

> will

>> > be
>> > running several IBM i partitions. I know I should use

several

smaller

>> > virtual disks vs 1 big one per partition so the IBM i OS

wil see

> multiple

>> > disks/arms. So lets say I have 4 IBM i Partitions all on

top of

VIOS.

>> > Each
>> > partition will see 8 35GB drives and lets say there are

24 139GB ( or

>> > whatever size VIOS wants to call them ) drives available

to VIOS to

>> > allocate
>> > disk space with. So lots of room but could use more arms.

Now I

start a

>> > really disk intensive process on 2 partitions. How can I

tell how

busy

> the

>> > drives really are at the VIOS level? On a partition with

IBM i

hosting I

>> > can
>> > do WRKDSKSTS on the base IBM i. Just wondering how to

approach disk

perf

>> > issues inthe future.
>> >
>> > Thanks
>> >
>> > --
>> > Kirk
>> > --

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