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EMC Symmetrix DMX-3 Product Guide
Mainframe Features and Support
2105 storage subsystem. EMC’s COM-PAV/MA feature provides
significant performance improvements for Symmetrix system users
who are experiencing high levels of device queuing (high IOSQ time).
COMPAV is a licensed product from EMC. Enginuity adds dynamic
support to the existing EMC PAV implementation. This enables the
MVS Workload Manager (in Goal Mode) or the EMC PAVManage
utility to reassign alias UCBs to a base UCB on the fly. In addition to
this support for Dynamic PAV, COM-PAV/MA now allows up to 127
aliases to be associated with one base device, improving the
opportunity for parallel I/O operations. This further reduces, and can
even eliminate, IOSQ time and enables EMC’s PAV support for larger
mainframe logical devices. COMPAV/MA is a licensed product from
EMC.
Note: Contact your local EMC Sales Representative for the most current
number of supported aliases.
Enginuity supports adding and deleting PAV base and alias features
online for FICON and ESCON channels. The EMC implementation is
designed to be 100-percent compatible with IBM’s implementation.
The aliases can also be managed with the PAVManage utility in the
ResourcePak Extended for z/OS.
Figure 51 Dynamic support of Parallel Access Volumes
UCB
OS/390 HOST
App 1 App 2 App 3
UCB UCB
UCB
z/OS HOST
App 1 App 2 App 3
UCB UCB
DSN 1
DSN 2
DSN 3
Logical view
Physical view
base
alias
alias
}
IOSQ
SYM-000091
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