W dniu 2012-02-14 14:06, Dan D pisze:
I'm wondering when 5 byte UCBs came into service and where this data comes from.
UCBCHAN in a z/OS 1.12 and 13 system's MODGEN still shows as 2 bytes.
How do you get 5 hex characters represented out of 2 bytes?
D IPLINFO
IEE254I 18.36.23 IPLINFO DISPLAY
SYSTEM IPLED AT 17.34.39 ON 01/10/2012
RELEASE z/OS 01.12.00 LICENSE = z/OS
USED LOAD00 IN SYS1.IPLPARM ON 02020
ARCHLVL = 2 MTLSHARE = N
IEASYM LIST = 00
IEASYS LIST = (00,01) (OP)
IODF DEVICE: ORIGINAL(02020) CURRENT(02020)
IPL DEVICE: ORIGINAL(03100) CURRENT(03100) VOLUME(SCARS1)
I've looked at the IEE254I message in the doc but it just says...
"The device number of the volume where the I/O configuration ..."
The "D U" command still only shows 4 bytes.
Any ideas?
1. 5-byte device address can be misunderstood. There is no simple
support for 5-byte addresses, the fifth byte have to be zero for most
devices. Also, in many places you can use only 4-byte (or 0xxxx) addresses.
2. Subchannel Set 1 was introduced in z9 (2094) and AFAIR z/OS 1.7.
3. Support for 5-byte adresses is growing up constantly, for example at
the time of z9 and z/OS 1.7 there was no possibility to IPL from 1xxxx
devices, there was no SS2, the only supported devices in SS1 were aliases.
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