Alan said:
> Instead of querying the control unit, you need to QUERY PAV ALL.
HyperPAVs
> are not associated with a base device until an I/O is performed, and
that
> association only lasts for the duration of that I/O. Hence the failure
of
> QUERY CU DASD ALIAS to give you anything useful. Instead, HyperPAVs are
> in "pools" that are selected by CP for association with a base device in
> the same pool.
While it is true that the association between base-and-alias only occurs
for the duration of an I/O, the Q CU ALIAS command will show the HyperPAV
aliases just fine:
q dasd details 1580
1580 CUTYPE = 2107-E8, DEVTYPE = 3390-0E, VOLSER = JS1580, CYLS = 71232
CACHE DETAILS: CACHE NVS CFW DFW PINNED CONCOPY
-SUBSYSTEM Y Y Y - N N
-DEVICE Y - - Y N N
DEVICE DETAILS: CCA = 00, DDC = --
DUPLEX DETAILS: --
HYPERPAV DETAILS: BASE VOLUME IN POOL 26
CU DETAILS: SSID = 0227, CUNUM = 1580
q cu 0227 dev
DASD CU 0227 DEVICES:
1580 1581 1582 1583 1584 1585 1586 1587
1588 1589 158A 158B 158C 158D 158E
q cu 0227 al
DASD CU 0227 ALIASES:
1586 1587 1588 1589 158A 158B 158C 158D
158E
q dasd details 1586
1586 CUTYPE = 2107-E8, DEVTYPE = 3390-0A, VOLSER =, CYLS = 0
CACHE DETAILS: CACHE NVS CFW DFW PINNED CONCOPY
-SUBSYSTEM Y Y Y - N N
-DEVICE N - - N N N
DEVICE DETAILS: CCA = 00, DDC = --
DUPLEX DETAILS: --
HYPERPAV DETAILS: ALIAS VOLUME IN POOL 26
CU DETAILS: SSID = 0227, CUNUM = 1580
Mark mentioned...
> The Q DASD DETAILS does not contain the HYPERPAV DETAILS
> ...snip...
> Looks like the device is not even detecting HyperPAV status.
This appears to be the case to me as well. A base device is only marked
as a base when we find at least one alias that is associated with either
the base subchannel (PAV) or the base subchannel's pool (HyperPAV). Until
then, the responses you see for Q PAV, Q CU, Q DASD DETAILS, etc., can
look like you have described here. If you have the device string defined
to HCD, what happens if you query one of the supposed alias subchannels?
Perhaps they still need to be varied online?
Regards,
Eric
Eric Farman
z/VM I/O Development
IBM Endicott, NY
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