One nice feature of CA-MIM (Allocation) nee MIA nee GTAF nee STAM is the
ability to take drive out of circulation completely in the plex by
placing it in OVERGENNED status.
@V 0939-093B,OVERGENNED
It would be nice if IBM would provide a similar status SERVICE or such
that really would bar the device from being put ONLINE unless it was
explicitly placed ONLINE by manual operator command.
Best Regards,
Sam Knutson, GEICO
Performance and Availability Management
mailto:[EMAIL PROTECTED]
(office) 301.986.3574
"Think big, act bold, start simple, grow fast..."
-----Original Message-----
From: IBM Mainframe Discussion List [mailto:[EMAIL PROTECTED] On
Behalf Of Jim Marshall
Sent: Friday, January 19, 2007 1:18 PM
To: [email protected]
Subject: Cart & Disk Allocation
There has been a running discussion about allocation of drive, carts or
disk which harkens back to the early days of MVS (later days of MVT)
where a shortage of drives, some drive was broken, or good SYSPROGs
sysgen'ed into the system more devices than they needed to keep from
doing IOGENs.
The problem was since the device was gen'ed and OFFLINE, it was a
candidate for ALLOCATION.
To resolve this problem, I found (and believe is still there) was a bit
in the UCB which was turned on when the CE ran OLTEP. If this bit was
on, the system thought it was unavailable. I wrote a small program which
could be run as a STC, passing the UCB address and whether to turn it ON
or OFF. If the bit was on for a broken drive (or non-existent one), the
system would think it had OLTEP running on it and skip any allocation
attempts.
The byte is the UCBFLG5 where the bit is the UCBNALOC EQU X'04' which
says "Offline device is in use by a System Component". I have not tried
this a long time but it might solve some issues folks have.
Jim
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