Shutdown - HP Surestore Disk Array 12h - And FC60 Service Manual
Hp surestore e disk array 12h user's and service manual (c5445-90901, september 1999)
Hide thumbs
Also See for Surestore Disk Array 12h - And FC60:
- Service manual (746 pages) ,
- Advanced user's manual (466 pages) ,
- User manual (310 pages)
Table of Contents
Concepts and Management
Disk Array Features
Shutdown
The disk array uses a coordinated process called Shutdown to take the disk array offline. The primary
function of Shutdown is to copy the contents of the controller NVRAM to the disks. This protects critical
data stored in the NVRAM against loss should battery backup for the NVRAM fail in the absence of ac
power.
In the Shutdown state, the disk array can still execute some SCSI commands from the host, but the host
cannot access any of the data on the disk array.
Shutdown is performed automatically when the disk array is turned off using the power switch on the
enclosure. The action of the power switch delays shutting off power long enough for the array controller to
copy the NVRAM contents to each disk.
NOTE! If power to the disk array is lost by means other than turning off the switch, the array will
not have time to perform a successful Shutdown. In this case, the battery can sustain the NVRAM
contents for a minimum of one week.
Shutdown can be initiated manually using the disk array control panel or using a host software utility.
However, a Shutdown makes all data on the disk array unavailable to the host.
92
Table of Contents
Troubleshooting
