IBM Enterprise Storage Server (ESS)

Gerald Bustamente

IBM Enterprise Storage Server (ESS)
I am curious if anyone if familiar with this new technology and could give
their impression on the impact of ESS and the need for placing datasets to
minimize hotspots and the impact on the need for reorganization.

Tall order, I know. But any advice would be greatly appreciated.

Thank,

Jerry Bustamente
Lands' End
608-935-4815

Joel Goldstein

Re: IBM Enterprise Storage Server (ESS)
(in response to Gerald Bustamente)
Message text written by DB2 Data Base Discussion List
>I am curious if anyone if familiar with this new technology and could give
their impression on the impact of ESS and the need for placing datasets to
minimize hotspots and the impact on the need for reorganization.<
+++++++++++++++++++++++++++++++++++++++
Based on the results so far, the ESS "may" remove the need to worry about
where datasets are placed.... because the multiple address assignment for a
volume allows
more than one path to the device and thus the datasets - the eliminates IOQ
time.
So far test results have been quite positive, at several ESP sites, but I
think we need to see some results from
really heavy production workloads before you bet the farm on "not" having
to worry
at all about placement.

It's somewhat interesting note that some clients have been told by IBM...

That they don't have to worry about where partitions go... but should still
separate indexes
from tablespaces. Now this statement makes no sense to me at all. I
would worry more
about heavy prefetch activity to multiple datasets concurrently by parallel
I/O streams...

If it does totally prove out in the production workload marketplace....
then buy IBM stock
because they'll own the DASD marketplace until some other vendor catches
up.
This appears to be the greatest advance in DASD performance with the last
couple of decades.

Regards,
Joel
|=======
| Joel Goldstein
| Responsive Systems Company
|=======
| WEB Site
| www.responsivesystems.com
|=======
| Buffer Pool Tool for DB2 & DASD/Xpert for DB2
| >>> The Answers for your performance problems <<<
|-------------------------------------------------------
| Tel.(800) DB2-EXPErt Tel.(800) 322-3973
| Tel.(732) 972-1261 Fax.(732) 972-9416
|=======

Rick Davis

Re: IBM Enterprise Storage Server (ESS)
(in response to Joel Goldstein)
Joel,
I know you're one of the best on stuff like this so, humour me and let me
ask some dumb questions.
How do they do that?
Doesn't eliminating IOQ imply a r/w head, or some such thing, for each address
assignment per volume?
Once the Nth address assignment is reached; what happens?
How does this relate to number of channels per controller?
Where can I find out more on this stuff?
Regards, Rick


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Subject: Re: IBM Enterprise Storage Server (ESS)




Message text written by DB2 Data Base Discussion List
>I am curious if anyone if familiar with this new technology and could give
their impression on the impact of ESS and the need for placing datasets to
minimize hotspots and the impact on the need for reorganization.<
+++++++++++++++++++++++++++++++++++++++
Based on the results so far, the ESS "may" remove the need to worry about
where datasets are placed.... because the multiple address assignment for a
volume allows
more than one path to the device and thus the datasets - the eliminates IOQ
time.
So far test results have been quite positive, at several ESP sites, but I
think we need to see some results from
really heavy production workloads before you bet the farm on "not" having
to worry
at all about placement.

It's somewhat interesting note that some clients have been told by IBM...

That they don't have to worry about where partitions go... but should still
separate indexes
from tablespaces. Now this statement makes no sense to me at all. I
would worry more
about heavy prefetch activity to multiple datasets concurrently by parallel
I/O streams...

If it does totally prove out in the production workload marketplace....
then buy IBM stock
because they'll own the DASD marketplace until some other vendor catches
up.
This appears to be the greatest advance in DASD performance with the last
couple of decades.

Regards,
Joel
|=======
| Joel Goldstein
| Responsive Systems Company
|=======
| WEB Site
| www.responsivesystems.com
|=======
| Buffer Pool Tool for DB2 & DASD/Xpert for DB2
| >>> The Answers for your performance problems <<<
|-------------------------------------------------------
| Tel.(800) DB2-EXPErt Tel.(800) 322-3973
| Tel.(732) 972-1261 Fax.(732) 972-9416
|=======