EMC Symmetrix DMX-3 User Manual

252
EMC Symmetrix DMX-3 Product Guide
Mainframe Features and Support
channel status is bits 40–47 in the CSW (370 mode) and bits 8–15 of
Word 2 of the SCSW (XA and ESA mode).
Unit status bits Table 33 on page 252 lists and describes the unit status bits.
Channel status bits Table 34 on page 252 lists and describes the channel status bits.
Table 33 Unit status bits
370 XA, ESA Meaning
Bit 32 Bit 0 Attention — READY status when set in conjunction with Device End and Unit Exception.
Bit 33 Bit 1 Status modifier — When set with Unit Check, indicates a usual condition, command retry; when
set with Busy, indicates the Symmetrix system is busy; when set with Device End, next CCW has
been skipped.
Bit 34 Bit 2 Control-unit end — Symmetrix no longer busy.
Bit 35 Bit 3 Busy — If Status Modifier clear, the drive is busy; if Status Modifier set, the channel director is
busy.
Bit 36 Bit 4 Channel end — Data or command transfer to/from channel is complete.
Bit 37 Bit 5 Device end — Device operation complete.
Bit 38 Bit 6 Unit check — Symmetrix system detected an error condition.
Bit 39 Bit 7 Unit exception — EOF on addressed track during a Read R0, Read IPL, or Read CKD, or Write
Key Data or Write Data operation. If Attention and Device End set, indicates a READY status.
Table 34 Channel status bits
370 XA, ESA Meaning
Bit 40 Bit 8 Program-controlled interruption (PCI) — CCW specified interrupt occurred.
Bit 41 Bit 9 Incorrect length — Number of bytes transferred were not equal to number of bytes specified
by CCW.
Bit 42 Bit 10 Program check — CCW programming error.
Bit 43 Bit 11 Protection check — Channel attempted to address a storage area prohibited by a protection
key.
Bit 44 Bit 12 Channel-data check — Incorrect parity.
Bit 45 Bit 13 Channel-control check — Channel hardware error.
Bit 46 Bit 14 Interface-control check — Invalid signal from the Symmetrix system (invalid signal sequence,
overly slow response, or parity error on Bus In).
Bit 47 Bit 15 Chaining check — Channel overrun during input operation.

EMC Symmetrix DMX-3 Specifications

General

Brand	EMC
Model	Symmetrix DMX-3
Category	Storage
Language	English