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Disk Management
10
The restorer disk command manages disks and displays disk locations, logical (RAID) layout,
usage, and reliability statistics. See
“disk” on page 213 for the complete command syntax.
Command output examples in this chapter show systems with 15 disk drives. Each type of DD400
series system reports on the number of disks actually in the system.
Each disk has two LEDs at the bottom of the disk carrier. The LED on the right glows a steady
green when the disk has power and is functioning normally. The same LED glows a steady red if
the disk has failed, or flashes green when the disk is a target of the
beacon operation. The LED on
the left flashes green whenever the disk is accessed.
On a restorer that uses external storage, the following disk command options are not valid:
disk beacon
disk fail
disk unfail
disk show debug
disk show failure-history
disk show reliability-data
With external storage, output from all other disk commands returns information about the LUNs
and volumes accessed by the restorer.
Fail a Disk
To set a disk to the failed state, use the disk fail disk-ID operation. To physically remove a
failed disk, see
“Replace Disks” on page 174. The disk fail disk-ID command asks for a
confirmation before carrying out the operation. Available to administrative users only.
disk fail disk-ID
A failed disk is automatically removed from a RAID disk group and is replaced by the spare disk
(when the spare is available). The disk use changes from spare to in use and the status becomes
reconstructing. See
“Display RAID Status for Disks” on page 94 to list the available spare.
Note The system can run with a maximum of two failed disks. Always replace a failed disk as
soon as possible.
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