NEC HV8600, User Manual

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System Overview 1-27
System Functions
The following subsections describe select system functions.
Automatic Rebuilding Function
The server supports the disk array automatic rebuilding function for data
recovery.
Note: The automatic rebuilding function supports a disk
array configuration of RAID levels, RAID1, RAID5 or RAID6.
Rebuilding is to regenerate all data from a failed disk to a replacement disk. A
rebuild is necessary after a failed disk drive is replaced with a new one.
In disk array configuration RAID levels, RAID1, RAID5, or RAID6 the failed
disk does not affect the operation. However, if another disk error occurs before
automatic rebuilding, the data may be destroyed. To prevent such an accident, it
will rebuild after the failed disk has been replaced.
In a conventional server, the user must select and execute automatic rebuilding
using various utilities. The server executes rebuilding automatically. Since the
server also supports hot-swapping function, the failed disk can be replaced while
the power is on.
If the disk array monitoring utility is installed, you may encounter the following
indication and activity. The automatic rebuilding is successfully in progress
unless the disk error LED on the disk, which you ran the automatic rebuilding
lights (amber). This indicates a disk drive failure before completion of the
rebuild.
„
The message “Rebuild was canceled” appears on the screen during
rebuilding.
„
It may seem that rebuilding stops a moment and restarts.
Observe the following when using an automatic rebuilding function.
„
Do not turn the power off. If power is turned off, automatic rebuilding
will not start.
„
Use an interval of 60 seconds or more between mounting and
dismounting the hard disk drive.
„
If a hard disk is being rebuilt, do not replace the hard disk.