Technical data

System Dump Analyzer

SHOW DEVICE

STATE IRP PID MODE CHAN FUNC WCB EFN AST IOSB STATUS

C 80BE2B00 00010064 E FFC0 C000 00000000 29 80127458 7FFA800C 0003

nop bufio,func

This example reproduces the SHOW DEVICE display for a single device unit,

VTA20. Whereas this display lists information from the UCB for VTA20,

including some addresses of key data structures and a list of pending I/O

requests for the unit, it does not display information about the controller

or its device driver. To display the latter sort of information, specify the

device-name as VTA (for example, SHOW DEVICE VTA).

SDA> SHOW DEVICE DU

I/O data structures

-------------------

DDB list

--------

Address Controller ACP Driver DPT DPT size

------- ---------- --- ------ --- --------

80D0B3C0 BLUES$DUA F11XQP DSDRIVER 807735B0 679D

8000B2B8 RED$DUA F11XQP DSDRIVER 807735B0 679D

80D0B9C0 RED$DUS F11XQP DSDRIVER 807735B0 679D

80D08BA0 BIGTOP$DUA F11XQP DSDRIVER 807735B0 679D

80D08AE0 TIMEIN$DUA F11XQP DSDRIVER 807735B0 679D

Press RETURN for more.

This excerpt from the output of the SHOW DEVICE DU command illustrates

the format of the DDB list display. In this case, the DDB list concerns

itself with those devices whose device type begins with DU (that is, DUA and

DUS). It displays devices of these types attached to various HSCs (RED$ and

BLUES$) and systems in a cluster (BIGTOP$ and TIMEIN$).

Following the DDB list, SHOW DEVICE DU produces displays for each

controller and each unit on each controller, as illustrated in the next example.

SDA–106