NEC N8403-019, User Manual

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Chapter 3 Features of Disk Array
Controller
This chapter describes the features of the disk array controller.
1. Rebuild
If a HDD fails, the rebuild feature can recover the data on the failed HDD. The access lamp on the failed
HDD lights amber. The rebuild can be applied to redundant virtual disks in RAID1 after the failed HDD is
replaced. While rebuilding, the access lamp on the replaced HDD flashes.
1-1 Manual Rebuild
The manual rebuild can be performed by using MegaRAID Storage Manager
TM
(called MSM hereafter), which
is the management utility of the disk array controller. Select a HDD and start the rebuild manually.
For the detailed operation, refer to the "MegaRAID Storage Manager User's Guide" on the NEC
EXPRESSBUILDER CD-ROM that comes with the server.
1-2 Auto Rebuild
The disk array controller can automatically start the rebuild without using a utility such as MSM.
The auto rebuild includes:
 Hot-swap rebuild
When the failed HDD is hot-swapped with a new HDD, the auto rebuild is automatically performed.
Notice
Note the following for the rebuild:

The HDD used for rebuild should have the same capacity, rotation speed, and
standard as the failed HDD.

During rebuild, the responsiveness of the server decreases due to high load.

During rebuild, do not shutdown or reboot the server. If the server is shutdown
accidentally due to power interruption, turn on the power as soon as possible. The
rebuild is automatically restarted.

The interval from the removal of the failed HDD to the installation of a new HDD
should be 60 sec or longer.

If the hot-swap rebuild does not work, perform the manual rebuild.

When the failed HDD is removed in a RAID1 configuration, the data redundancy is
lost. Replace with a new HDD as soon as possible and perform the rebuild process.