Yes this is correct "Probably running into a limitation on the number of
UCBs in a single z/OS LPAR."

Thank You,

Terry Martin
Lockheed Martin - Citic
z/OS and z/VM Performance Tuning and Operating Systems Support
Office - 443 348-2102
Cell - 443 632-4191


-----Original Message-----
From: The IBM z/VM Operating System [mailto:ib...@listserv.uark.edu] On
Behalf Of McKown, John
Sent: Monday, April 05, 2010 4:28 PM
To: IBMVM@LISTSERV.UARK.EDU
Subject: Re: HiperSocket UCBs

> -----Original Message-----
> From: The IBM z/VM Operating System 
> [mailto:ib...@listserv.uark.edu] On Behalf Of Alan Altmark
> Sent: Monday, April 05, 2010 3:25 PM
> To: IBMVM@LISTSERV.UARK.EDU
> Subject: Re: HiperSocket UCBs
> 
<snip>
> You have
> - 16 HiperSocket chpids available
> - 64 control units per chpid
> - 256 devices (subchannels) per control unit
> - Providing up to 12K devices, spread across 16 chpids or all in one.
> - Yielding up to 4096 NICs
> 
> Are you sure you're up against a HiperSocket maximum?  If you 
> have 4096 
> NICs, consider using VLANs.
> 
> Alan Altmark
> z/VM Development
> IBM Endicott

Probably running into a limitation on the number of UCBs in a single
z/OS LPAR.

--
John McKown 
Systems Engineer IV
IT

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