John,
Thank you for the explanation.
In fact my both questions can be rephrased to the following:
Is given chpid or CU port able to work in HPF and non-HPF mode
simultaneously?
Your expectations (and mine too) are that yes.
Regards
--
Radoslaw Skorupka
Lodz, Poland
W dniu 2011-03-30 06:36, John Ticic pisze:
Radoslaw,
my understanding is that zHPF is negotiated between z/OS and the DSS
CU if all the channels in the path group are FEx2 or FEx4. So, if this is
the case, then I/O between that z/OS LPAR and that CU can use zHPF.
So, my take on Q1 is that the host that has FEx2/FEx4 will be able to
use zHPF and the other host will not be able to.
In Q2, the Host can negotiate a zHPF connection to one DASD and not
to the other.
These are only my expectations and I would be interested in your
findings - especially if they are different.
SMF 73 (RMF Channel stats) will give you some nice information on how
many I/Os are using transport mode.
SMF 74.5 (Rank statistics) will give you detailed zHPF information per
device (starting with z/OS 1.12) (probably Vendor DSS specific).
John
Quotation from some IBM TechDoc:
"zHPF is supported on FICON Express2 (FEx2) and FICON Express4
(FEx4)
channels. It is not supported on FICON Express channels.
"I/Os executed on path groups with a mix of FICON Express and FICON
Express2 or FICON Express4 channels in the same path group will not
be
eligible to convert to zHPF. For zHPF, all the channels in the same
channel path group have to be FEx2 or FEx4. "
The above is clear in scenario with one host and one CU.
What about many-to-many scenarios?
Q1: The following scenario: two host connected to single CU, via
switch.
Same channel adapter in CU. One host is zHPF capable, the other is
not
(FICON Express "1"). Will zHPF work between CU and first host?
Q2: Another scenario: zHPF-capable host connected via switch to two
different DASD boxes. First DASD is zHPF-capable, the second is not.
Both DASDs are connected to the same CHPIDs.
Will zHPF be used for communication between host and first CU?
Any clue?
Regards
--
Radoslaw Skorupka
Lodz, Poland
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