SCF Reference Manual for the Storage Subsystem (G06.27+, H06.04+)

Managing Magnetic Disks
SCF Reference Manual for the Storage Subsystem—529937-008
7-3
Starting a Magnetic Disk
Starting a Magnetic Disk
The START DISK Command (page 14-109) makes a stopped disk accessible to user
processes. When finished, the disk is in the STARTED state.
Considerations for START DISK
•
New M8xxx disks that have been added and are being used for the first time must
be initialized before they can be started.
•
If you are starting a mirrored volume, see Considerations When Reviving a
Mirrored Volume on page 7-4.
•
If you receive a DUPLICATE VOLUME message in response to a START
command, you must rename the disk. See Naming a Magnetic Disk on page 6-26.
•
When a system is loaded or when you use the START DISK command, SCF uses
the default volume name. If the default volume name is already in use, the volume
is started using the alternate volume name. If the alternate volume name is also in
use, the storage subsystem uses the volume name in the system configuration
database and the disk is left in the DOWN state. For more information, see Naming
a Magnetic Disk on page 6-26.
•
The START DISK command can introduce discrepancies between the disk file
labels for SQL files and the catalog descriptions of the SQL files, thereby making
the SQL dictionary inconsistent. These inconsistencies make the SQL database
unusable.
•
Use the RESET DISK command followed by the START DISK command to bring
up a disk path that is in any of these states:
°
STOPPED state, substate HARDDOWN
°
SERVICING state, substate TEST
°
SERVICING state, substate SPECIAL
Starting an Unmirrored Magnetic Disk
1. Check the current status of the disk:
-> STATUS $DISK00
2. If the disk is not in the STOPPED state, substate DOWN, see Resetting a Magnetic
Disk on page 7-11.
3. If the disk is in the STOPPED state, substate DOWN, start the disk:
-> START $DISK00