W dniu 02.07.2020 o 23:51, Tony Thigpen pisze:
I am seeing some DS8000s where a mod-27 is defined as 30051 cylinders.
I am seeing other sites were the mod-27 is defined with 32760 cylinders.
I know the architectural limit of a mod-27 is 32760 cylinders, but if
you work with multiples of mod-1
On Jul 2, 2020, at 9:21 PM, Pew, Curtis G wrote:
>
> I consider them while
“I consider them experimental while …”
--
Pew, Curtis G
curtis@austin.utexas.edu
--
For IBM-MAIN subscribe / signoff / archive access
On Jul 2, 2020, at 7:25 PM, Feller, Paul
<02fc94e14c43-dmarc-requ...@listserv.ua.edu> wrote:
>
> In this shop a MOD-27 is 32,760 cyls and a MOD-54 is 65,520 cyls. As for how
> they are allocated, that I can't answer.
Several years ago I moved all our DASD to “3390-54” with 65,520
Tony to answer your questions. In this shop a MOD-27 is 32,760 cyls and a
MOD-54 is 65,520 cyls. As for how they are allocated, that I can't answer. We
don't have IBM DASD and the vendor we have does the configuration based on what
we ask for. Just to round things out the EAVs we do have
Keep in mind that you are dealing with virtual DASD. There never was a 3390
model 27 or 54, so DASD providers are free to use whatever sizes tey want.
Using 3 times a model 9 capacity and 6 times a model 9 capacity is
conventional, but there's noting wrong with using a slightly larger size.
Some physical devices only allocate volumes in multiples of Mod 1s, or
gather scattered Mod 1 segments into a full volume. 32K cylinders is
29.4 times a Mod 1 of 1113 cylinders. Not much different, but need to
make sure DR site or replacement dasd unit uses same size or larger
for restores or
I am seeing some DS8000s where a mod-27 is defined as 30051 cylinders. I
am seeing other sites were the mod-27 is defined with 32760 cylinders.
I know the architectural limit of a mod-27 is 32760 cylinders, but if
you work with multiples of mod-1 units, the 30051 number make sense.
I also
