IOPs conversion to MegaBytes

[Jose Medeiros-2]

Good Morning,

I have to admit that I have very little experience with IOMetter, and was asked ti measure the through put of a  Compaq Storage Works EMA 12000 SAN at Intel when the database developers were having blocking issue's with their SQL 2000 data base cluster and were trying to blame the I/O of the controllers / San luns.

When I attended Intel Developer Forum in 2008 and the session where we were measuring the I/O through put of Vmware ESX server 3.01, I could not get a direct answer as how I can convert IOPs to Megabytes, and was hoping that some one on this list give me the math formula that I could use, or point me to a website that lists a comparison.

Thank you in advance,

Jose F. Medeiros
San Jose, California
www.sjpc.org


     

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[Jose Medeiros-2]

Thank you both to Lukáš Kubín  & Dustin Cox on their response, so to clarify the formula that I use:

IOPS = I/Os per second
Megabytes = IOPS * IO transfer size

For example, 10000 IOPS with an IO transfer size of 4K = 40000K per
second or ~40MB per second.

In the case of an HP EVA 8000 where the controllers are rated at 300,000 IOPS, does either one of you know how much data in Megabytes that equates two, as HP does not list the Block size, and how it compares to a Hatachi USP-V, or EMC clarion SAN?

Jose :-)
www.myspace.com/josemedeiros1


--- On Fri, 5/29/09, Jose Medeiros <josemedeiros007@...> wrote:

> From: Jose Medeiros <josemedeiros007@...>
> Subject: [Iometer-user] IOPs conversion to MegaBytes
> To: iometer-user@...
> Cc: medeiros@...
> Date: Friday, May 29, 2009, 11:15 AM
>
> Good Morning,
>
> I have to admit that I have very little experience with
> IOMeter, and was asked to measure the through put of
> a  Compaq Storage Works EMA 12000 SAN at Intel, when the
> database developers were having blocking issue's with their
> SQL 2000 data base cluster and were trying to blame the I/O
> of the controllers / San luns ( Part of the issue was how many disks were used in carving the LUN by my predecessor).
>
> When I attended the Intel Developer Forum in 2008 and the
> session where we were measuring the I/O through put of
> Vmware ESX server 3.01, I could not get a direct answer as to
> how I can convert IOPs to Megabytes, and was hoping that
> some one on this list may have the math formula that I could
> use, or point me to a website that lists a comparison.
>
> Thank you in advance,
>
> Jose F. Medeiros
> San Jose, California
> www.sjpc.org
>

     

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[Joe Eiler-2]

Assmuming you know your transfer size....
and have decided if you want real megabytes (2^20) or "marketing" megabytes
(10^6)

IOPs * transfer size= bytes/second

For example, say you are seeing 4000 IOPS and using 16Kbyte requests
4000 * 16K = 64000Kbytes/s



----- Original Message -----
From: "Jose Medeiros" <josemedeiros007@...>
To: <iometer-user@...>
Cc: <medeiros@...>
Sent: Friday, May 29, 2009 1:15 PM
Subject: [Iometer-user] IOPs conversion to MegaBytes

>
> Good Morning,
>
> I have to admit that I have very little experience with IOMetter, and was
> asked ti measure the through put of a  Compaq Storage Works EMA 12000 SAN
> at Intel when the database developers were having blocking issue's with
> their SQL 2000 data base cluster and were trying to blame the I/O of the
> controllers / San luns.
>
> When I attended Intel Developer Forum in 2008 and the session where we
> were measuring the I/O through put of Vmware ESX server 3.01, I could not
> get a direct answer as how I can convert IOPs to Megabytes, and was hoping
> that some one on this list give me the math formula that I could use, or
> point me to a website that lists a comparison.
>
> Thank you in advance,
>
> Jose F. Medeiros
> San Jose, California
> www.sjpc.org
>
>
>
>
> ------------------------------------------------------------------------------
> Register Now for Creativity and Technology (CaT), June 3rd, NYC. CaT
> is a gathering of tech-side developers & brand creativity professionals.
> Meet
> the minds behind Google Creative Lab, Visual Complexity, Processing, &
> iPhoneDevCamp as they present alongside digital heavyweights like
> Barbarian
> Group, R/GA, & Big Spaceship. http://p.sf.net/sfu/creativitycat-com
> _______________________________________________
> Iometer-user mailing list
> Iometer-user@...
> https://lists.sourceforge.net/lists/listinfo/iometer-user 

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[kukacz]

Jose, this is a really complex problem we might not be able to solve
soon neither easily.

At first - block size is given by application/OS, not a storage array.

Also - numbers like 300k IOps are more of a marketing terms, not
really helpful in performance planning. Most often, vendors use
sequential type of traffic and 512B (half kilobyte) blocks to prove
them. Not an IO pattern you're likely to see in most applications.

Especially for databases, the number of IOps you are able to reach
depends highly on number and type of drives used. Raw performance of a
15k SAS drive is around 150 IOps (without any RAID operations
involved). The real numbers you get are based on lots of factors -
type of raid, type and firmware quality of storage controller, number
of drives, connection type (4Gbps FC, 8Gbps FC, iSCSI, InfiniBand
...).

You can get 1000 IOps of an array running database operations, while
you can get 10000 IOps of the same array running streaming
(sequential) traffic. For the first type of traffic, the raid type and
number of drives might push the brake of performance. For the second
one, the bandwidth (connection type) is more likely to become a limit.

It's useless to tell you any numbers related to the mentioned storage
systems. They won't help you.

The only thing which might help is to compare exact things. Compare
same app's performance before/after some change in SAN, new app
version. Or compare exactly same IOmeter test results of two arrays.

Roughly, you can only guess by using the raw numbers of IO per drive I
used above.

Greetings,

Lukas

On Fri, May 29, 2009 at 10:03 PM,  <josemedeiros007@...> wrote:

>
> Thank you both to Lukáš Kubín  & Dustin Cox on their response, so to clarify the formula that I use:
>
> IOPS = I/Os per second
> Megabytes = IOPS * IO transfer size
>
> For example, 10000 IOPS with an IO transfer size of 4K = 40000K per
> second or ~40MB per second.
>
> In the case of an HP EVA 8000 where the controllers are rated at 300,000 IOPS, does either one of you know how much data in Megabytes that equates two, as HP does not list the Block size, and how it compares to a Hatachi USP-V, or EMC clarion SAN?
>
> Jose :-)
> www.myspace.com/josemedeiros1
>
>
> --- On Fri, 5/29/09, Jose Medeiros <josemedeiros007@...> wrote:
>
>> From: Jose Medeiros <josemedeiros007@...>
>> Subject: [Iometer-user] IOPs conversion to MegaBytes
>> To: iometer-user@...
>> Cc: medeiros@...
>> Date: Friday, May 29, 2009, 11:15 AM
>>
>> Good Morning,
>>
>> I have to admit that I have very little experience with
>> IOMeter, and was asked to measure the through put of
>> a  Compaq Storage Works EMA 12000 SAN at Intel, when the
>> database developers were having blocking issue's with their
>> SQL 2000 data base cluster and were trying to blame the I/O
>> of the controllers / San luns ( Part of the issue was how many disks were used in carving the LUN by my predecessor).
>>
>> When I attended the Intel Developer Forum in 2008 and the
>> session where we were measuring the I/O through put of
>> Vmware ESX server 3.01, I could not get a direct answer as to
>> how I can convert IOPs to Megabytes, and was hoping that
>> some one on this list may have the math formula that I could
>> use, or point me to a website that lists a comparison.
>>
>> Thank you in advance,
>>
>> Jose F. Medeiros
>> San Jose, California
>> www.sjpc.org
>>
>
>
>
>
> ------------------------------------------------------------------------------
> Register Now for Creativity and Technology (CaT), June 3rd, NYC. CaT
> is a gathering of tech-side developers & brand creativity professionals. Meet
> the minds behind Google Creative Lab, Visual Complexity, Processing, &
> iPhoneDevCamp as they present alongside digital heavyweights like Barbarian
> Group, R/GA, & Big Spaceship. http://p.sf.net/sfu/creativitycat-com
> _______________________________________________
> Iometer-user mailing list
> Iometer-user@...
> https://lists.sourceforge.net/lists/listinfo/iometer-user
>

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