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SCF Reference Manual for the Storage Subsystem (G06.28+, H06.05+, J06.03+)

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LISTDEV Information for the Storage Subsystem
You can use the SCF LISTDEV command to display configured information about processes that
have a device type and that are known to SCF.
For these storage subsystem devices, you can specify an existing ldev number in any storage
subsystem command (unless the command has a path specification):
• The $ZZSTO storage subsystem manager
• Disks (physical and virtual)
• Tape drives
• Open SCSI devices
• Storage pools
• The $ZSMS SMF manager
• The $ZSLM or $ZSLM2 SCSI lock manager
These devices are assigned an LDEV number in the order in which they were configured and as
recorded in the destination control table.
Example
-> LISTDEV STORAGE
LDev Name PPID BPID Type RSize Pri Program
69 $ZZSTO 0,275 1,324 (65,0 ) 4096 180 \COMM.$SYSTEM.SYS01.TZSTO
6 $SYSTEM 0,257 1,257 ( 3,42) 4096 220 \COMM.$SYSTEM.SYS01.OSIMAGE
114 $ZIMBU 9,46 8,67 ( 3,36) 4096 219 \COMM.$SYSTEM.SYS01.OVDP
116 $ZERO 8,47 9,75 ( 3,36) 4096 219 \COMM.$SYSTEM.SYS01.OVDP
123 $WORK2 5,264 4,276 ( 3,43) 4096 220 \COMM.$SYSTEM.SYS01.TSYSDP2
…
138 $TAPE0 2,263 3,282 ( 4,9 ) 2048 200 \COMM.$SYSTEM.SYS01.OTPPROCP
…
316 $L700C16 1,282 0,286 ( 8,0 ) 4096 220 \COMM.$SYSTEM.SYS01.TDSCSI
…
201 $POOL6 9,19 8,22 (25,0 ) 4096 180 \COMM.$SYSTEM.SYS01.OPP
…
79 $ZSMS 5,30 4,39 (52,0 ) 4096 180 \COMM.$SYSTEM.SYS01.OMP
433 $ZSLM 0,281 1,266 (67,0 ) 1024 221 \COMM.$SYSTEM.SYS01.TZSLM
Fault Tolerance
An important concept, and a possible source of confusion for users, is the three ways that the word
primary can be used when configuring and managing devices.
Primary Processor
An IOP runs in two processors: primary and backup. The PRIMARYCPU and BACKUPCPU attributes
of the ADD command are set when the device is configured.
To change which processor runs the primary process, specify that processor number in a PRIMARY
command. For example, see “Swapping Processors for a Disk” (page 109). However, the PRIMARY
command does not change the configured value of the PRIMARYCPU or BACKUPCPU attributes.
Primary Path
A nonmirrored device can be accessed through two paths: a primary path and a backup path. To
set the paths use these attributes of the ADD command when the disk is configured:
PRIMARYSACPRIMARYLOCATION
BACKUPSACBACKUPLOCATION
28 Introduction to the Storage Subsystem