Thanks Alan. I will do some research to see what exactly is defined. 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 Alan Altmark Sent: Monday, April 05, 2010 11:52 PM To: IBMVM@LISTSERV.UARK.EDU Subject: Re: HiperSocket UCBs On Monday, 04/05/2010 at 10:42 EDT, "Martin, Terry R. (CMS/CTR) (CTR)" <terry.mar...@cms.hhs.gov> wrote: > Each guest that needs to talk to z/OS needs a Triplet UCB definition on > a HiperSocket CHPID defined to it. The more guest I have that require > this the more UCBs I need to use, eventually I hit the max UCBs allowed > on a CHPID. For the best performance a HiperSocket interface is defined > on the z/Linux guest without going through the VLAN. This interface > connects to the HiperSocket network defined on the z/OS system and data > is passed at memory speeds. Terry, I'm still having trouble believing that you have 4096 NICs (12,228 UAs/subchannels/UCBs) defined for your HiperSockets chpids. Can you confirm? > To get around this I could create another LPAR since the same spanned > HiperSockets UCB can be used on different LPARS just not on the same > LPAR. If you *have* maxed out HiperSockets, new LPARs aren't going to help. You can't have more than 12K HiperSocket subchannels on the box. I suspect your problem is that you're wasting subchannels across all LPARs. (1) Make sure you are coding PARTITION= on the CHPID to limit subchannel definition to only the LPARs that are permitted to use the chpid. (2) Create as many CNTLUNITs for your HiperSocket chpids as you need. Remember that all the devices on a single CU must be shared or unshared. z/OS will need access to one CNTLUNIT per HiperSocket chpid it needs access to. The other 48 control units will be given to z/VM. (3) On the CUs for z/OS, use PARTITION= on the IODEVICE to limit the definition to z/OS. (4) For the remaining HiperSocket CUs, use PARTITION= (5) Define only 3 IODEVICEs for each z/OS CNTLUNIT Do the UNITADD math. > I am still on a z9 but our new z10 was just delivered and I understand > that the z10 allows for more HiperSocket UCBs so maybe this will be a > non issue with the z10. I am still trying to nail this down. z9 and z10 are the same, both having 16 HiperSocket chpids. When in doubt, check the Machine Limits appendix in the IOCP book. Alan Altmark z/VM Development IBM Endicott
