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

Resetting a Disk
The “RESET DISK Command” (page 271) puts a disk into the STOPPED state, substate DOWN,
ready for restarting.
• Use the RESET command to prepare a device to be started if:
A disk is in the STOPPED state, substate HARDDOWN.◦
◦ A hardware error has occurred.
◦ You stopped the disk with an ABORT command.
◦ The disk was stopped for service.
◦ A STOP or ABORT command fails to put the device into the STOPPED state, substate
DOWN.
See “Resetting One Disk” (page 103).
• You can reset and start more than one disk at a time:
After installing or replacing a component like a disk, SEB, MSEB, PMF CRU, IOMF CRU,
or ServerNet/DA.
◦
◦ After repairing a fabric failure
When a fabric fails, the storage subsystem automatically switches the disk paths, if
possible, so that the disks remains operational.
After repairing a fabric failure, failed disk paths are not automatically restarted. They
remain HARDDOWN until you restart the disk process. The storage subsystem never
attempts to use the failed path, which creates a potential single point of failure.
See “Resetting a Group of Disks” (page 104).
Considerations for RESET DISK
• The RESET command is ignored if the process is started.
• If the disk is in the STARTING state, substate REVIVE, the disk process is suspended in that
state until either another START command restarts the revive operation or a STOP command
terminates the revive operation.
Resetting One Disk
1. Check the current status of the disk:
-> STATUS $DISK00-*
2. If any disk paths are in one of these states:
• SERVICING state, SPECIAL substate
• SERVICING state, TEST substate
• STOPPED state, HARDDOWN substate
Put those paths into a STOPPED state, substate DOWN:
-> RESET $DISK00
Paths that are in the STARTED state are unaffected by the RESET command.
3. To prevent a specified disk path from starting:
-> ABORT DISK $disk00-MB
4. Start the disk:
-> START $DISK00
Resetting a Disk 103