Re: Performance of 2780 controller and 141GB drives

Mirroring is significantly more reliable, but IBM is scamming you if they
tell you it's the same price for disk.  You will use significantly more
slots, bays, controllers and maintenance.

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



                                                                           
             Brian                                                         
             <iserieslists@gma                                             
             il.com>                                                    To 
             Sent by:                  Midrange Systems Technical          
             midrange-l-bounce         Discussion                          
             s@xxxxxxxxxxxx            <Midrange-L@xxxxxxxxxxxx>           
                                                                        cc 
                                                                           
             08/18/2005 10:09                                      Subject 
             AM                        Performance of 2780 controller and  
                                       141GB drives                        
                                                                           
             Please respond to                                             
             Midrange Systems                                              
                 Technical                                                 
                Discussion                                                 
             <midrange-l@midra                                             
                 nge.com>                                                  
                                                                           
                                                                           




Any experience with consolidating DASD on the new 141GB drives out there?

On the new box we are ordering it has been suggested that we move from
a RAID environment to a mirrored environment. However, to be
affordable, this would mean consolidating the data storage onto fewer
drives. Being from the old school of "small drives and lots of arms",
I am skeptical of the performance of this configuration.

The current configuration on our 730 consists of two RAID sets, one
with 20 8GB 10K drives and the other with 16 17GB 10K drives. This
gives ~400GB on 36 arms. The proposed configuration for the i5 520 is
for mirroring at the IOP level using the fast 2780 controllers with  a
total of 16 141GB drives plus 2 35GB drives as mirrored load source in
the CEC. This gives ~1TB of usable data storage.

Any opinions? Suggestions?

Kind regards,

Brian

--
This is the Midrange Systems Technical Discussion (MIDRANGE-L) mailing list
To post a message email: MIDRANGE-L@xxxxxxxxxxxx
To subscribe, unsubscribe, or change list options,
visit: http://lists.midrange.com/mailman/listinfo/midrange-l
or email: MIDRANGE-L-request@xxxxxxxxxxxx
Before posting, please take a moment to review the archives
at http://archive.midrange.com/midrange-l.