I have Donna to thank for telling me about LDEV 4679 about 20 years ago.

I also recall some faint memory, some vendors having to fix their 
programs when we started using four digit LDEVs because they only 
allowed three digits in their View screens.

On 5/29/21 2:11 PM, Stan Sieler wrote:
> Re:
>
> On Sat, May 29, 2021 at 7:25 AM Tracy Johnson <[log in to unmask]> wrote:
>
>> That is the number of devs at the same time.  It has no bearing on the
>> largest LDEV number.
>>
> and:
>
>>>>> ioconfig:ad ldev=5178;id=HPTCPJD;path=NONE
>>>>>                    ^
>>>>>           **error** parameter value too large
>>>>> So, what is the maximum value allowed?
> Yes, 4679 is the largest legal LDEV number.
>
> And, Tracy's right about it being unrelated to the number of LDEVs you can
> have.
>
> Various things  have various limits (e.g., maximum number of disks in a
> volume set).
> Today, I noticed that the DUMP facility (or, perhaps more accurately, the
> GETDUMP
> mechanism) is limited to 1,000 disk LDEVs.
>
> I tended to avoid 4 digit LDEVs, perhaps because some commands/programs
> might have expected to display them in three columns ... I can't recall.
> Also, there may be some tables built at run-time that allocate space for
> all potential devices (i.e., they directly index with LDEV) ... and, thus,
> you waste a (small, overall) amount of space if you have an LDEV
> way up there.
>
> Stan
>
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-- 
Tracy Johnson
BT







NNNN


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