Re: IPLing to clear Temp addresses

[DrFranken <midrange@xxxxxxxxxxxx>]

 Rob,

  Since V5R3 Temp address spaces are not recycled until they are 85% 
used (when there are only something like 60Billion unused addresses at 
that point) .  If this is a concern there is a way to lower that number. 
IBM realized that it was kinda pointless to use a new temp address space 
at every IPL when many customers could go literally years and not hit 
25%!   I just checked a customer machine that has been up for about 2 
weeks shy of a year and they are at 6.2%  I know of one model 595 shop 
that goes more than a year on a single temp space so I think this was a 
good change.

   - Larry 'DrFranken" Bolhuis.

On 10/7/2010 10:14 AM, rob@xxxxxxxxx wrote:
> Jump back into your wayback machine and remember back on CISC machines.
> Remember when you used to have to IPL on a periodic basis just to clear up
> "% temp addresses"?  If you ever maxxed that out you were dead and had to
> IPL right then and there.  Upgrading to RISC cut our downtimes in half
> because "that one machine" no longer had to be IPLed monthly - it could
> wait until our every other month regular downtime.
>
> Well, it's been years since I've paid attention to "% temp addresses". Now
> I just noticed this on one lpar:
> % temp addresses . . . . :     31.173
> And this is the info on QCTL (which only gets set at IPL so that's a good
> guess on our last IPL date/time):
> Entered system:
>    Date  . . . . . . . . . . . . . . . . . . :   08/14/10
>    Time  . . . . . . . . . . . . . . . . . . :   12:24:50
> That was a regularly scheduled downtime.
> Good news is that this weekend is it's next regularly scheduled downtime.
> But if that was normal, then might that not mean this system could go a
> maximum of six to seven months between IPL's?  Since we IPL every other
> month it is no skin off my teeth.  But, I suspect there are shops which
> might have a concern with this.
>
> This weekend we will also upgrade it from this:
> Product ID  . . . . . . . . . . . . . :   5761999
> IPL source  . . . . . . . . . . . . . :   ##MACH#B
> Release of base option  . . . . . . . :   V6R1M1 L00
> PTF
> ID
> TL60047
>
> To this:
> Product ID  . . . . . . . . . . . . . :   5770999
> IPL source  . . . . . . . . . . . . . :   ##MACH#B
> Release of base option  . . . . . . . :   V7R1M0 L00
> PTF
> ID
> TL10229
>
>
> Rob Berendt