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DuraStor 412R/6320SS/7320SS Installation and User’s Guide
Understanding Mirrored Operations
The mirroring feature causes configuration changes to be mirrored
to the opposite controller in an active-active configuration. The
mirrored configuration is stored in the other controller’s firmware
(Flash). If a controller fails and is replaced, then on boot up, it
attempts to retrieve this configuration data from the opposite
controller. The intent is that the user will not need to reconfigure a
new controller when it is replaced.
Note:
Dual RAID controller operations require that both
controllers must have the same version firmware installed.
If a replacement controller uses its mirrored configuration, you will
see it print a message during boot (saying it’s using the mirrored
configuration), and then it will reboot (rebooting is necessary for
the mirrored configuration to take effect).
Here’s how the mirrored configuration works in different
scenarios:
■
Stand-alone mode—The feature is not active.
■
Active-active mode where both controllers are operating
normally – Each controller uses its own local configuration.
■
Active-active mode where one controller boots and the other
controller does not boot due to some problem – The controller
that boots uses its local configuration.
■
Active-active mode where one controller is up when a new
replacement controller boots – the new controller attempts to
get its mirrored configuration from the other controller. If it is
not available, it will try to use its local configuration. If that is
not available, then it will use the default settings.
DuraStor IUG - Online.book Page 24 Friday, July 19, 2002 3:06 PM