Chapter 9 Troubleshooting Your Array 9-3
A failed controller is managed by the surviving controller, which disables and
disconnects from its counterpart while gaining access to all the signal paths. The
surviving controller then manages the ensuing event notifications and takes over all
processes. It is always the primary controller regardless of its original status, and
any replacement controller afterward assumes the role of the secondary controller.
The failover and failback processes are completely transparent to the host.
Controllers are hot-swappable if you are using a redundant configuration, and
replacing a failed unit takes only a few minutes. Since the I/O connections are on
the controllers, you might experience some unavailability between the times when
the failed controller is removed and a new one is installed in its place.
To maintain your redundant controller configuration, replace the failed controller as
soon as possible. For details, refer to Sun StorEdge 3000 Family FRU Installation Guide.
9.3 Rebuilding Logical Drives
This section describes automatic and manual procedures for rebuilding logical
drives. The time required to rebuild a logical drive is determined by the size of the
logical drive, the I/O that is being processed by the controller and the array’s
Rebuild Priority. With no I/O being processed, time required to build a 2 terabyte
RAID 5 logical drive is:
■ Sun StorEdge 3510 FC Array. 4.5 hours
■ Sun StorEdge 3511 FC Array. 6.5 hours
Note – As disks fail and are replaced, the rebuild process regenerates the data and
parity information that was on the failed disk. However, the NVRAM configuration
file that was present on the disk is not re-created. After the rebuild process is
complete, restore your configuration as described in “Restoring Your Configuration
(NVRAM) From Disk” on page 8-20.
9.3.1 Automatic Logical Drive Rebuild
Rebuild with Spare. When a member drive in a logical drive fails, the controller first
determines whether there is a local spare drive assigned to the logical drive. If there
is a local spare drive, the controller automatically starts to rebuild the data from the
failed drive to the spare.
To Next Page
Loading...
Need help?
General
