No Subject

["Rich Loesch (MIS)" <RLOESCH@xxxxxxxxxxx>]

Gordon wrote:

We have 4 AS/400s with 30 - 120 GB of RAIDed DASD on each.  2 of the 4
systems have journal ASPs.  Ideally we would like to have all 4 systems
the same.  IBM used to recommend a separate user ASP for journalling
for     performance and protection.  Now with RAID they seem to be saying
that the benefits are no longer there, is that true?  What is your
experience?  Do you have a separate user ASP for journalling?  Are you
going away from or towards journal ASPs?  Is this a decision that you
can make for all of your systems or do you decide
system by system?  What do you use as your criteria for creating a
journal ASP?


I say make the ASP for a couple reasons. First it helps the operators   
distinguish real DASD growth from receiver fluctuation. Second you   
allocate the space up front for the ASP so you won't have to worry about   
your receivers when your production data grows. I'm not real sure why the   
performance factor wouldn't come into play too. Since you would want to   
create your ASP in it's own RAID set(s) you will still have dedicated   
disk units for the ASP.

Rich Loesch
rloesch@borders.com     
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