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Cisco Physical Security Multiservices Platform Series User Guide
OL-21838-03
A P P E N D I X
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Recovering from a Hard Drive Failure
This appendix describes how to recover from a hard drive failure on a Multiservices Platform Series
device. The process for doing so depends on the physical security product that you are using and the
number of hard drives that are in your Multiservices Platform Series device.
A hard drive that fails on a Multiservices Platform Series device displays a lit red LED on the front panel
of its bay. If a hard drive fails, see
(for 1-RU models) or Table
(for 2-RU models),
locate your physical security application and hard drive configuration, then follow the steps in the
Recovering column.
When replacing a hard drive, be aware of these guidelines:
•
A system with RAID-1 or RAID-5 hard drives is fault-tolerant. In these systems, data is preserved
if only one drive fails, and you can hot swap a failed hard drive. After hot swapping a drive, it is not
necessary to reboot or reimage the system. The system becomes fully operational following drive
replacement and after the RAID set goes through an automatic rebuild process. The rebuild process
can take several days. If another drive fails before the rebuild process completes, all system data and
configuration is lost and the system must be reimaged.
•
A system with RAID-6 hard drives is fault-tolerant and data is preserved in the following cases:
–
One hard drive fails
–
Two hard drives fail at the same time
–
One hard drive files, then another hard drive fails after the first one has been replaced and while
it is rebuilding.
You can hot swap one or two failed hard drives. After hot swapping drives, it is not necessary to
reboot or reimage the system. The system becomes fully operational following drive replacement
and after the RAID set goes through an automatic rebuild process. The rebuild process can take
several days. If you hot swap two drives and a third drive fails before the rebuild process completes,
all system data and configuration is lost and the system must be reimaged.
•
In systems with JBOD-type/RAID-0 hard drives, all data on a hard drive is lost if the drive fails. In
this case, you must reimage the system after replacing the drive.
