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3.2 Volumes
With VSE/ESA and the RVA, the subsystem volumes can be defined in different
emulation modes. This makes the RVA absolutely adaptable to your needs.
The following device type emulations are supported with the RVA:
•
3380 model J, K, and KE (KE is a 3380K compatible device with the same
number of cylinders (1770) as a 3380E).
•
3390 models 1, 2, and 3
3.3 Host Connection
Host connectivity options include parallel and/or ESCON attachment. Extended
connectivity parallel channel configurations of up to 32 channels are available
and supported without bus and tag output connections. The bus and tag outputs
are internally terminated, so the RVA must physically be the last in a
daisy-chained configuration. ESCON configurations include up to 128 logical
links, either as direct links or through an ESCON Director.
The physical channel configuration must match the definitions in the I/O
configuration data set (IOCDS). The physical connections on the CPU and the
RVA must reflect the statements in the IOCDS. Mistakes can go undetected until
later maintenance actions cause unnecessary impact. The channel configuration
should be planned such that the impact of a single component failure is
minimized. For an IOCDS example, refer to Appendix D, “IOCDS Example” on
page 63.
3.3.1 VSE/ESA Input/Output Configuration Program
Support for the stand-alone IOCP is supplied with the hardware system′s service
processor or processor controller. IOCP describes a system′s I/O configuration
to the CPU.
Before you install VSE/ESA natively (not under VM/ESA or an LPAR), make sure
that you have fully configured your system through IOCP. Starting with VSE/ESA
1.3, the VSE/ESA IOCP is automatically installed during initial installation of
VSE/ESA. You can use the IOCP batch program to create a new IOCDS when
you change the hardware configuration. You can use the IOCP batch program to
define and validate the IOCP macro instructions if you prepare for the installation
of a new processor. Use skeleton SKIOCPCN (available in VSE/ICCF library 59)
as a base for configuration changes.
An IOCDS must be generated for the hardware the first time through the
stand-alone IOCP delivered with the processor. For this program you can use
prepared IOCP macro instructions that have been generated on another
processor. The specified device numbers for VSE/ESA must be within the range
0000 through 0FFF. The devices themselves can be attached to any available
link.
For more information about IOCP, refer to the processor′s IOCP manual and to
the
IOCP User
′
s Guide and ESCON Channel-to-Channel Reference
, GC38-0401.
14 RAMAC Virtual Array, Peer-to Peer Remote VSE/ESA