Re: Unload/Reload

[DrFranken <midrange@xxxxxxxxxxxx>]

If your drives are still balancing then something is amiss.  You 
previously stated that disk I/O workload was exceptionally low on this 
system so I doubt that is the problem. Normally disk balancing of type 
*CAPACITY starts out a bit slow but completes within a single digit 
number of hours. You say CHKASPBAL still shows that balancing is active 
for ASP(1) Correct?  How much memory and paging/faulting is there in the 
machine pool? Much work is done there for this function especially at 
the beginning of the balance work so starving that will have a very 
negative effect. In WRKDSKSTS you should see very lobsided numbers 
between the old and new disks with the old being very much higher on 
reads and the new guys high on writes.  The new drives are usually much 
lower % busy at this point as they are just writing for now.

    - Larry "DrFranken" Bolhuis


On 9/17/2012 7:19 AM, rob@xxxxxxxxx wrote:
> Other than the potential catastrophic loss of data if your save turns out
> to be worthless this is better than an unload/reload, why?
>
> I would like to think that I could have performed an unload/reload faster.
>   Ok longer outage time.  But a development lpar, done over a weekend,
> could stand that.  As it was I had to have two outages, one to remove the
> raid striping, and then another IPL because the system wouldn't drop the
> old disks from the configuration.
>
> And I'd surely love to see these message disappear from CHKASPBAL
> CPI18A3-Unit 15 is selected for end allocation.
> But the way IBM explained it to me is that during a STRASPBAL it marks the
> new drives as in this state to balance all new writes to the old drives
> and not make the new disks "hot" by having all new writes pile up on these
> drives only.
>
> After how many days/weeks it takes to complete this balancing I plan on
> doing a TRCASPBAL and then a STRASPBAL, this time with *USAGE instead of
> *CAPACITY.
>
> I realize that first sentence could be interpreted as "Other than that,
> Mrs. Lincoln, how did you like the play?".
>
>
> Rob Berendt