12 Hard Disk Replacement; Raid 6; How Do I Know A Disk Has Failed; Drive Leds - HP StorageWorks D2D100 - Backup System User Manual

12 Hard disk replacement

In this chapter:
• "RAID 6" on page 123
• "How do I know a disk has
• "Replacing the hard

RAID 6

The HP D2D is a RAID 6 device. RAID 6 works in the same way as RAID 5 with one important difference.
It provides protection against double disk failures and failures while a single disk is rebuilding.
This means that actual storage capacity is approximately 3.375 TB for the 6–disk model and 7.5 TB
for the 12–disk model.

How do I know a disk has failed?

The Disk online LED (1) on the failed disk shows amber.
Figure 41 Drive LEDs
NOTE:
For more information about these LEDs refer to
The Web Management Interface identifies failed or predictive failed disks. The HP D2D Backup System
operates correctly with up to two failed disks, but protection is limited. It is important to replace a failed
or predictive failed disk as soon as possible. Any subsequent disk failure will result in complete data loss.
failed?" on page 123
disk" on page 127
"Drive
D2D Backup SystemHP D2D4004 and HP D2D4009
LEDs" on page 63.
123