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

• On NonStop S-series servers, the system disk and its mirror cannot be M8xxxFibre Channel
disks.
• These attributes cannot be changed:
The system disk always runs with FSTCACHING ON.◦
◦ You cannot decrease these attribute values online because the disk must be stopped to
decrease them. The configured value will can decreased, but the IOP will continue to run
with the original, larger value until it is stopped and restarted.
– CBPOOLLEN
– MAXLOCKSPEROCB
– MAXLOCKSPERTCB
– NUMDISKPROCESSES
Automating Disk Configuration
To automate the configuration of internal disks when you insert the disk into a slot (or, if the system
is down, when the next system load occurs), use the “ALTER SUBSYS Command” (page 240) to set
AUTOCONFIGURE { ON | OFF }.
Automatic configuration enables the system to automatically configure an internal disk when initially
detected after a system load, processor reload, or disk insertion
NOTE: HP does not recommend using AUTOCONFIGURE with M8xxx Fibre Channel disks.
When the AUTOCONFIGURE attribute is set to on, the system configures the disk using the profile
stored in the system configuration database. The disk profile used is $ZZSTO.INTERNAL-DISK,
unless you have configured a custom profile for a specific enclosure. See “Configuring Custom
Profiles” (page 75).
Plug and play not only configures a disk automatically but also automatically labels an unlabeled
disk, starts the disk, and revives a mirrored disk.
Limitations of Automatic Configuration
• You cannot automatically configure model 45xx disks in a modular disk subsystem.
• You cannot automatically configure virtual disks.
• You cannot use AUTOCONFIGURE with enclosure interleaving if either of these is true:
Two internal disks of a mirrored volume are installed in separate enclosures.◦
◦ The adapters that are connected to the two 45xx disks of a mirrored disk volume are
installed in separate enclosures.
For more information about enclosure interleaving, see the NonStop S-Series Planning
and Configuration Guide.
Enabling Automatic Disk Configuration
1. View the automatic configuration attributes that are enabled for the system:
-> INFO SUBSYS $ZZSTO
STORAGE - Info SUBSYS $ZZSTO
AutoConfigure AutoRevive Autostart BulkIO LabelTape UPS
OFF OFF OFF ON ON OFF
2. To automate configuration for internal disks:
Automating Disk Configuration 73