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Rob,

You are totally correct, but they failed to do so.  Apparently the DASD
addressing algorithm changed from V5R2 to V5R3, and apparently this would
have killed you using *ANYONE'S external DASD.  With internal DASD, this is
handled under the covers.

Al

Al Barsa, Jr.
Barsa Consulting Group, LLC

400>390

"i" comes before "p", "x" and "z"
e gads

Our system's had more names than Elizabeth Taylor!

914-251-1234
914-251-9406 fax

http://www.barsaconsulting.com
http://www.taatool.com
http://www.as400connection.com



                                                                           
             rob@xxxxxxxxx                                                 
             Sent by:                                                      
             midrange-l-bounce                                          To 
             s@xxxxxxxxxxxx            Midrange Systems Technical          
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                                       <midrange-l@xxxxxxxxxxxx>           
             12/12/2005 10:56                                           cc 
             AM                                                            
                                                                   Subject 
                                       Re: EMC DASD vs. IBM DASD and MIMIX 
             Please respond to         for 24/7 operation                  
             Midrange Systems                                              
                 Technical                                                 
                Discussion                                                 
             <midrange-l@midra                                             
                 nge.com>                                                  
                                                                           
                                                                           




I hate EMC dasd also because of a bad experience years ago.

However, Al, your customer should have checked their EMC level.  Much like
we all have to check the Memo to User to find out that certain load source
drives change, tape drives no longer supported, etc.

Rob Berendt
--
Group Dekko Services, LLC
Dept 01.073
PO Box 2000
Dock 108
6928N 400E
Kendallville, IN 46755
http://www.dekko.com





Al Barsa <barsa@xxxxxxxxxxxxxxxxxxx>
Sent by: midrange-l-bounces@xxxxxxxxxxxx
12/09/2005 07:40 PM
Please respond to
Midrange Systems Technical Discussion <midrange-l@xxxxxxxxxxxx>


To
Midrange Systems Technical Discussion <midrange-l@xxxxxxxxxxxx>
cc

Fax to

Subject
Re: EMC DASD vs. IBM DASD and MIMIX for 24/7 operation







IMHO, the best DASD is IBM internal.  When using any external DASD, IBM
does not have the diagnosis tools to find specific problems.  They do with
internal DASD.

The reason that you by an AS/400 (a few people call it the iSeries [that
way IBM insures that it will *NEVER gain mindshare]) is to buy one product
from one vendor, IBM Rochester, and when it breaks, you have one phone
number to call.

I have a client that upgraded his system to V5R3 before checking the code
level of the EMC DASD this spring.   Turned that DASD in to fairly near 2
TB of boat anchor.  This would not have happened with IBM internal.

Al

Al Barsa, Jr.
Barsa Consulting Group, LLC

400>390

"i" comes before "p", "x" and "z"
e gads

Our system's had more names than Elizabeth Taylor!

914-251-1234
914-251-9406 fax

http://www.barsaconsulting.com
http://www.taatool.com
http://www.as400connection.com




             "Dave Odom"
             <Dave.Odom@tucson
             az.gov>                                                    To

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             midrange-l-bounce                                          cc

             s@xxxxxxxxxxxx
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                                       EMC DASD vs. IBM DASD and MIMIX for

             12/09/2005 06:54          24/7 operation
             PM


             Please respond to
             Midrange Systems
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             <midrange-l@midra
                 nge.com>






Gang,

First, have any of you hooked up EMC DASD to an iSeries?   If so, good
news/bad news?
Second, how do you like it vs IBM's DASD?
Third, supposedly EMC has a way to "split" or "mirror" or some such
their DASD to allow a site to have a similar function like what MIMIX
and MIMIX Lite can perform?   Yes/No?
Any MIMIX users out there that have used it between iSeries LPARs?
Good News/Bad News?

Problem statement:  I'm looking for a way to reduce or eliminate my
current 5-6 hour backup and 5-6 hour reorg windows so I don't impact my
e-commerce and other applications as much or at all.

Alternatives considering:

- Faster tape drive, like an IBM 3581 - Might reduce my current window
for backups in half; does nothing for reorg window
- Add fourth LPAR with MIMIX between it and our Production LPAR and
backup and reorg jobs that make the environments for applications
essentially 24/7 operation, i.e. backup from 4th LPAR which is the MIMIX
"mirrored" LPAR from Production.   Since I also have "blade servers"
under the LPARs, I probably would need to use the MIXIX for Windoz
solution as well to keep the 5 blades in each LPAR synced.  For reorgs,
switch back and forth between LPARs and reorg the one that is not
"online" at the time.   Resync LPARs after backups and reorgs.
- Use EMC DASD if it has a good or better solution than adding another
LPAR and MIMIX
- Don't install 4th LPAR but instead use our 2nd LPAR used for testing
of new releases of application software and for our ODS/DW (Operational
Data Store/Data Warehouse) Project. Install MIMIX between it and the
Production (1st) LPAR, add more DASD and perhaps turn on 4th Processor
if necessary.  I understand this would work even though application
levels might be different as MIMIX doesn't care about application
levels, only data changes and the application's file structure RARELY
changes.
- Just use SAVE WHILE IN USE function of V5R2 or V5R3
- Turn on 4th Processor if necessary for reorgs or whatever needs more
power
- Is there a better mousetrap with V5R4 due out soon?

Thanks in advance,

Dave Odom
Arizona
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