What happens if you box a device offline?

Can you bring it back online?

Rob Schramm

On Tue, Jan 29, 2019, 2:19 AM Mehrshad Manshadi <
[email protected] wrote:

> In response to a  D U,,ALLOC command, msgIEE106I is issued
> indicating a jobname of *UNKNOWN for certain DASD units.  It is
> also not possible to Vary the unit(s) offline (unable to vary).
>    This problem was traced to an OEM product changing the UCB
> in a job's TIOT without incrementing the new UCB's UCBUSER
> (Number of Current Users use-count) field.  When the new UCB
> was subsequently de-allocated, MVS Allocation code decremented
> UCBUSER, causing it to become negative.  Since UCBUSER was then
> not zero, the device appeared to be allocated even though there
> was no address space known to be allocated to it.  As a result,
> UCBALOC was never turned off and the device could not be
> varied OFFLINE.
>
>      See Scratch Pad for OEM information.
> Please help me to solve the problem. from where i can find scratch pad for
> OEM? in OS configuration or hardware?!How can I turned off UCBALOC ?
> For your information we changed the number of aliases in IODF and just
> activate it without IPL or power on reset the machine.
> Thanks
>
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