Craig,

We have a number of SP20's at our site and were advised when we installed
our first unit that it is best to have all the CACHE memory on the array
for READ (4Mb is taken up by the SP20 system), with no WRITE memory. MPE
transaction manager (XM Checkpoint) takes care of all CACHEING. We found a
definate increase in performance when we moved from 16Mb memory to 64Mb
memory (maximum).

Hope this is helpfull to you.

Andy Popay
HP3000 Operations Manager
Hanson Aggregates - UK



On Sun, 6 Apr 2003 20:33:04 -0700, Craig Lalley <[log in to unmask]> wrote:

>After sucessfully installing a Mod 20 array on an HP3000 this weekend, I
have a bunch of questions.  What I am really looking for is documentation
regarding the Model 20 in an HP3000 environment.  If anyone can point me in
the right direction or possible have a white paper saved, I would truely
apprecaite it.
>
>Here is are a few of the questions.
>
>The model 20 supports 64Mb per SP, that memory is then allocated to the
>
>SP (4MB minimum)
>
>Read Cache
>
>Write Cache
>
>Can the HP3000 utilize the write cache on the Model 20?  The statistics
seem to show otherwize, but I may not have caught the XM checkpoint.
>
>TIA,
>
>-Craig
>
>
>
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